CWE-131
AllowedIncorrect Calculation of Buffer Size
Abstraction: Base · Status: Draft
The product does not correctly calculate the size to be used when allocating a buffer, which could lead to a buffer overflow.
270 vulnerabilities reference this CWE, most recent first.
GHSA-983J-96V4-GM2C
Vulnerability from github – Published: 2022-05-24 17:30 – Updated: 2022-05-24 17:30On Juniper Networks MX Series with MS-MIC or MS-MPC card configured with NAT64 configuration, receipt of a malformed IPv6 packet may crash the MS-PIC component on MS-MIC or MS-MPC. This issue occurs when a multiservice card is translating the malformed IPv6 packet to IPv4 packet. An unauthenticated attacker can continuously send crafted IPv6 packets through the device causing repetitive MS-PIC process crashes, resulting in an extended Denial of Service condition. This issue affects Juniper Networks Junos OS on MX Series: 15.1 versions prior to 15.1R7-S7; 15.1X53 versions prior to 15.1X53-D593; 16.1 versions prior to 16.1R7-S8; 17.2 versions prior to 17.2R3-S4; 17.3 versions prior to 17.3R3-S6; 17.4 versions prior to 17.4R2-S11, 17.4R3; 18.1 versions prior to 18.1R3-S11; 18.2 versions prior to 18.2R3-S6; 18.2X75 versions prior to 18.2X75-D41, 18.2X75-D430, 18.2X75-D53, 18.2X75-D65; 18.3 versions prior to 18.3R2-S4, 18.3R3; 18.4 versions prior to 18.4R2-S5, 18.4R3; 19.1 versions prior to 19.1R2; 19.2 versions prior to 19.2R1-S5, 19.2R2; 19.3 versions prior to 19.3R2.
{
"affected": [],
"aliases": [
"CVE-2020-1680"
],
"database_specific": {
"cwe_ids": [
"CWE-131"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2020-10-16T21:15:00Z",
"severity": "MODERATE"
},
"details": "On Juniper Networks MX Series with MS-MIC or MS-MPC card configured with NAT64 configuration, receipt of a malformed IPv6 packet may crash the MS-PIC component on MS-MIC or MS-MPC. This issue occurs when a multiservice card is translating the malformed IPv6 packet to IPv4 packet. An unauthenticated attacker can continuously send crafted IPv6 packets through the device causing repetitive MS-PIC process crashes, resulting in an extended Denial of Service condition. This issue affects Juniper Networks Junos OS on MX Series: 15.1 versions prior to 15.1R7-S7; 15.1X53 versions prior to 15.1X53-D593; 16.1 versions prior to 16.1R7-S8; 17.2 versions prior to 17.2R3-S4; 17.3 versions prior to 17.3R3-S6; 17.4 versions prior to 17.4R2-S11, 17.4R3; 18.1 versions prior to 18.1R3-S11; 18.2 versions prior to 18.2R3-S6; 18.2X75 versions prior to 18.2X75-D41, 18.2X75-D430, 18.2X75-D53, 18.2X75-D65; 18.3 versions prior to 18.3R2-S4, 18.3R3; 18.4 versions prior to 18.4R2-S5, 18.4R3; 19.1 versions prior to 19.1R2; 19.2 versions prior to 19.2R1-S5, 19.2R2; 19.3 versions prior to 19.3R2.",
"id": "GHSA-983j-96v4-gm2c",
"modified": "2022-05-24T17:30:52Z",
"published": "2022-05-24T17:30:52Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2020-1680"
},
{
"type": "WEB",
"url": "https://kb.juniper.net/JSA11077"
}
],
"schema_version": "1.4.0",
"severity": []
}
GHSA-9P4C-8VQH-7RPV
Vulnerability from github – Published: 2022-03-11 00:02 – Updated: 2022-03-17 00:01There is an incorrect buffer size calculation vulnerability in the video framework. Successful exploitation of this vulnerability may affect availability.
{
"affected": [],
"aliases": [
"CVE-2021-40052"
],
"database_specific": {
"cwe_ids": [
"CWE-131"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2022-03-10T17:43:00Z",
"severity": "HIGH"
},
"details": "There is an incorrect buffer size calculation vulnerability in the video framework. Successful exploitation of this vulnerability may affect availability.",
"id": "GHSA-9p4c-8vqh-7rpv",
"modified": "2022-03-17T00:01:54Z",
"published": "2022-03-11T00:02:29Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-40052"
},
{
"type": "WEB",
"url": "https://consumer.huawei.com/en/support/bulletin/2022/3"
},
{
"type": "WEB",
"url": "https://device.harmonyos.com/en/docs/security/update/security-bulletins-phones-202208-0000001363876177"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-9Q6C-GRQ3-7PRG
Vulnerability from github – Published: 2022-04-29 02:58 – Updated: 2025-01-16 18:30Buffer overflow in Apache 2.0.50 and earlier allows local users to gain apache privileges via a .htaccess file that causes the overflow during expansion of environment variables.
{
"affected": [],
"aliases": [
"CVE-2004-0747"
],
"database_specific": {
"cwe_ids": [
"CWE-120",
"CWE-131"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2004-10-20T04:00:00Z",
"severity": "MODERATE"
},
"details": "Buffer overflow in Apache 2.0.50 and earlier allows local users to gain apache privileges via a .htaccess file that causes the overflow during expansion of environment variables.",
"id": "GHSA-9q6c-grq3-7prg",
"modified": "2025-01-16T18:30:56Z",
"published": "2022-04-29T02:58:17Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2004-0747"
},
{
"type": "WEB",
"url": "https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11561"
},
{
"type": "WEB",
"url": "https://lists.apache.org/thread.html/rf6449464fd8b7437704c55f88361b66f12d5b5f90bcce66af4be4ba9@%3Ccvs.httpd.apache.org%3E"
},
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},
{
"type": "WEB",
"url": "https://exchange.xforce.ibmcloud.com/vulnerabilities/17384"
},
{
"type": "WEB",
"url": "http://secunia.com/advisories/12540"
},
{
"type": "WEB",
"url": "http://secunia.com/advisories/34920"
},
{
"type": "WEB",
"url": "http://securitytracker.com/id?1011303"
},
{
"type": "WEB",
"url": "http://support.ca.com/irj/portal/anonymous/phpsupcontent?contentID=205147"
},
{
"type": "WEB",
"url": "http://www.gentoo.org/security/en/glsa/glsa-200409-21.xml"
},
{
"type": "WEB",
"url": "http://www.kb.cert.org/vuls/id/481998"
},
{
"type": "WEB",
"url": "http://www.mandrakesecure.net/en/advisories/advisory.php?name=MDKSA-2004:096"
},
{
"type": "WEB",
"url": "http://www.novell.com/linux/security/advisories/2004_32_apache2.html"
},
{
"type": "WEB",
"url": "http://www.redhat.com/support/errata/RHSA-2004-463.html"
},
{
"type": "WEB",
"url": "http://www.trustix.org/errata/2004/0047"
},
{
"type": "WEB",
"url": "http://www.vupen.com/english/advisories/2009/1233"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-9QCW-X77V-9QJH
Vulnerability from github – Published: 2024-09-11 06:30 – Updated: 2024-09-11 06:30Incorrect Calculation of Buffer Size (CWE-131) in the Controller 6000 and Controller 7000 OSDP message handling, allows an attacker with physical access to Controller wiring to instigate a reboot leading to a denial of service.
This issue affects: Controller 6000 and Controller 7000 9.10 prior to vCR9.10.240816a (distributed in 9.10.1530 (MR2)), 9.00 prior to vCR9.00.240816a (distributed in 9.00.2168 (MR4)), 8.90 prior to vCR8.90.240816a (distributed in 8.90.2155 (MR5)), 8.80 prior to vCR8.80.240816b (distributed in 8.80.1938 (MR6)), all versions of 8.70 and prior.
{
"affected": [],
"aliases": [
"CVE-2024-39808"
],
"database_specific": {
"cwe_ids": [
"CWE-131"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-09-11T04:15:05Z",
"severity": "MODERATE"
},
"details": "Incorrect Calculation of Buffer Size (CWE-131) in the Controller 6000 and Controller 7000 OSDP message handling, allows an attacker with physical access to Controller wiring to instigate a reboot leading to a denial of service. \n\n\n\nThis issue affects: Controller 6000 and Controller 7000 9.10 prior to vCR9.10.240816a (distributed in 9.10.1530 (MR2)), 9.00 prior to vCR9.00.240816a (distributed in 9.00.2168 (MR4)), 8.90 prior to vCR8.90.240816a (distributed in 8.90.2155 (MR5)), 8.80 prior to vCR8.80.240816b (distributed in 8.80.1938 (MR6)), all versions of 8.70 and prior.",
"id": "GHSA-9qcw-x77v-9qjh",
"modified": "2024-09-11T06:30:39Z",
"published": "2024-09-11T06:30:39Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-39808"
},
{
"type": "WEB",
"url": "https://security.gallagher.com/en-NZ/Security-Advisories/CVE-2024-39808"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-9QGV-FVWW-QGVH
Vulnerability from github – Published: 2022-05-13 01:43 – Updated: 2022-05-13 01:43In writeToParcel and createFromParcel of RttManager.java, there is a permission bypass due to a write size mismatch. This could lead to a local escalation of privileges where the user can start an activity with system privileges, with no additional execution privileges needed. User interaction is not needed for exploitation. Product: Android. Versions: 6.0, 6.0.1, 7.0, 7.1.1, 7.1.2, 8.0, 8.1. Android ID: A-70398564.
{
"affected": [],
"aliases": [
"CVE-2017-13289"
],
"database_specific": {
"cwe_ids": [
"CWE-131"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2018-04-04T16:29:00Z",
"severity": "HIGH"
},
"details": "In writeToParcel and createFromParcel of RttManager.java, there is a permission bypass due to a write size mismatch. This could lead to a local escalation of privileges where the user can start an activity with system privileges, with no additional execution privileges needed. User interaction is not needed for exploitation. Product: Android. Versions: 6.0, 6.0.1, 7.0, 7.1.1, 7.1.2, 8.0, 8.1. Android ID: A-70398564.",
"id": "GHSA-9qgv-fvww-qgvh",
"modified": "2022-05-13T01:43:09Z",
"published": "2022-05-13T01:43:09Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2017-13289"
},
{
"type": "WEB",
"url": "https://source.android.com/security/bulletin/2018-04-01"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-9RV5-7GPW-9G55
Vulnerability from github – Published: 2026-04-24 06:31 – Updated: 2026-04-24 06:31Delta Electronics AS320T has incorrect calculation of the buffer size on the stack in the GET/PUT request handler of the web service.
{
"affected": [],
"aliases": [
"CVE-2026-1949"
],
"database_specific": {
"cwe_ids": [
"CWE-131"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-04-24T06:16:03Z",
"severity": "CRITICAL"
},
"details": "Delta Electronics AS320T has incorrect calculation of the buffer size on the stack in the GET/PUT request handler of the web service.",
"id": "GHSA-9rv5-7gpw-9g55",
"modified": "2026-04-24T06:31:17Z",
"published": "2026-04-24T06:31:17Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-1949"
},
{
"type": "WEB",
"url": "https://filecenter.deltaww.com/news/download/doc/Delta-PCSA-2026-00006_AS320T%20Multiple%20vulnerabilities%20(CVE-2026-1949,%201950,%201951,%201952).pdf"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-C2XR-V86F-V878
Vulnerability from github – Published: 2023-04-13 09:30 – Updated: 2024-04-04 03:26memory corruption in modem due to improper check while calculating size of serialized CoAP message
{
"affected": [],
"aliases": [
"CVE-2022-33211"
],
"database_specific": {
"cwe_ids": [
"CWE-131",
"CWE-20"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2023-04-13T07:15:00Z",
"severity": "CRITICAL"
},
"details": "memory corruption in modem due to improper check while calculating size of serialized CoAP message",
"id": "GHSA-c2xr-v86f-v878",
"modified": "2024-04-04T03:26:49Z",
"published": "2023-04-13T09:30:19Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-33211"
},
{
"type": "WEB",
"url": "https://www.qualcomm.com/company/product-security/bulletins/april-2023-bulletin"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-C8PJ-3W86-3GQP
Vulnerability from github – Published: 2024-02-20 18:30 – Updated: 2025-11-04 21:31An out-of-bounds write vulnerability exists in the sopen_FAMOS_read functionality of The Biosig Project libbiosig 2.5.0 and Master Branch (ab0ee111). A specially crafted .famos file can lead to arbitrary code execution. An attacker can provide a malicious file to trigger this vulnerability.
{
"affected": [],
"aliases": [
"CVE-2024-23606"
],
"database_specific": {
"cwe_ids": [
"CWE-131",
"CWE-787"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-02-20T16:15:09Z",
"severity": "CRITICAL"
},
"details": "An out-of-bounds write vulnerability exists in the sopen_FAMOS_read functionality of The Biosig Project libbiosig 2.5.0 and Master Branch (ab0ee111). A specially crafted .famos file can lead to arbitrary code execution. An attacker can provide a malicious file to trigger this vulnerability.",
"id": "GHSA-c8pj-3w86-3gqp",
"modified": "2025-11-04T21:31:10Z",
"published": "2024-02-20T18:30:34Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-23606"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OIRLGNQM33KAWVWP5RPMAPHWNP3IY5YW"
},
{
"type": "WEB",
"url": "https://talosintelligence.com/vulnerability_reports/TALOS-2024-1925"
},
{
"type": "WEB",
"url": "https://www.talosintelligence.com/vulnerability_reports/TALOS-2024-1925"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-C92M-WMF9-QXFW
Vulnerability from github – Published: 2026-06-25 09:31 – Updated: 2026-06-30 03:37In the Linux kernel, the following vulnerability has been resolved:
drm/amdkfd: Fix buffer overflow in SDMA queue checkpoint/restore on GFX11
The v11 MQD manager incorrectly assigned the CP-compute variants of checkpoint_mqd/restore_mqd for KFD_MQD_TYPE_SDMA queues. These functions use sizeof(struct v11_compute_mqd) (2048 bytes) instead of sizeof(struct v11_sdma_mqd) (512 bytes), causing a 1536-byte overflow.
During CRIU checkpoint of an SDMA queue on Navi3x: - checkpoint_mqd() reads 2048 bytes from a 512-byte SDMA MQD buffer, leaking 1536 bytes of adjacent GTT memory to userspace
During CRIU restore: - restore_mqd() writes 2048 bytes into a 512-byte SDMA MQD buffer, corrupting 1536 bytes of adjacent GTT memory (often the ring buffer or neighboring MQDs)
This is a copy-paste regression unique to v11. All other ASIC backends (cik, vi, v9, v10, v12) correctly use the SDMA-specific variants.
Add checkpoint_mqd_sdma() and restore_mqd_sdma() functions that properly handle the smaller v11_sdma_mqd structure, matching the pattern used in other MQD managers.
(cherry picked from commit 6fa41db7ffdec97d62433adf03b7b9b759af8c2c)
{
"affected": [],
"aliases": [
"CVE-2026-53143"
],
"database_specific": {
"cwe_ids": [
"CWE-131",
"CWE-787"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-06-25T09:16:31Z",
"severity": "HIGH"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdkfd: Fix buffer overflow in SDMA queue checkpoint/restore on GFX11\n\nThe v11 MQD manager incorrectly assigned the CP-compute variants of\ncheckpoint_mqd/restore_mqd for KFD_MQD_TYPE_SDMA queues. These functions\nuse sizeof(struct v11_compute_mqd) (2048 bytes) instead of sizeof(struct\nv11_sdma_mqd) (512 bytes), causing a 1536-byte overflow.\n\nDuring CRIU checkpoint of an SDMA queue on Navi3x:\n- checkpoint_mqd() reads 2048 bytes from a 512-byte SDMA MQD buffer,\n leaking 1536 bytes of adjacent GTT memory to userspace\n\nDuring CRIU restore:\n- restore_mqd() writes 2048 bytes into a 512-byte SDMA MQD buffer,\n corrupting 1536 bytes of adjacent GTT memory (often the ring buffer\n or neighboring MQDs)\n\nThis is a copy-paste regression unique to v11. All other ASIC backends\n(cik, vi, v9, v10, v12) correctly use the SDMA-specific variants.\n\nAdd checkpoint_mqd_sdma() and restore_mqd_sdma() functions that properly\nhandle the smaller v11_sdma_mqd structure, matching the pattern used in\nother MQD managers.\n\n(cherry picked from commit 6fa41db7ffdec97d62433adf03b7b9b759af8c2c)",
"id": "GHSA-c92m-wmf9-qxfw",
"modified": "2026-06-30T03:37:13Z",
"published": "2026-06-25T09:31:19Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53143"
},
{
"type": "WEB",
"url": "https://access.redhat.com/security/cve/CVE-2026-53143"
},
{
"type": "WEB",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2492719"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/16dad1fb0d783a4008de30e32d0038c393de05b1"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/2c5b66c9b4057b385566940935ebc32f6e6ebfd2"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/352ea59028ea48a6fff77f19ae28f98f71946a80"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d02f05d30f35b036f7cbaf72de634affb5b38ec6"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d3efcadfe3eea5b4263b8f2d4463b15c9fc46a64"
},
{
"type": "WEB",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53143.json"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-CJCH-253G-8HP2
Vulnerability from github – Published: 2025-11-18 21:32 – Updated: 2025-11-19 00:31A vulnerability has been identified in the GRUB (Grand Unified Bootloader) component. This flaw occurs because the bootloader mishandles string conversion when reading information from a USB device, allowing an attacker to exploit inconsistent length values. A local attacker can connect a maliciously configured USB device during the boot sequence to trigger this issue. A successful exploitation may lead GRUB to crash, leading to a Denial of Service. Data corruption may be also possible, although given the complexity of the exploit the impact is most likely limited.
{
"affected": [],
"aliases": [
"CVE-2025-61661"
],
"database_specific": {
"cwe_ids": [
"CWE-131"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-11-18T19:15:49Z",
"severity": "MODERATE"
},
"details": "A vulnerability has been identified in the GRUB (Grand Unified Bootloader) component. This flaw occurs because the bootloader mishandles string conversion when reading information from a USB device, allowing an attacker to exploit inconsistent length values. A local attacker can connect a maliciously configured USB device during the boot sequence to trigger this issue. A successful exploitation may lead GRUB to crash, leading to a Denial of Service. Data corruption may be also possible, although given the complexity of the exploit the impact is most likely limited.",
"id": "GHSA-cjch-253g-8hp2",
"modified": "2025-11-19T00:31:24Z",
"published": "2025-11-18T21:32:31Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-61661"
},
{
"type": "WEB",
"url": "https://access.redhat.com/security/cve/CVE-2025-61661"
},
{
"type": "WEB",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2413827"
},
{
"type": "WEB",
"url": "http://www.openwall.com/lists/oss-security/2025/11/18/8"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H",
"type": "CVSS_V3"
}
]
}
Mitigation
When allocating a buffer for the purpose of transforming, converting, or encoding an input, allocate enough memory to handle the largest possible encoding. For example, in a routine that converts "&" characters to "&" for HTML entity encoding, the output buffer needs to be at least 5 times as large as the input buffer.
Mitigation MIT-36
- Understand the programming language's underlying representation and how it interacts with numeric calculation (CWE-681). Pay close attention to byte size discrepancies, precision, signed/unsigned distinctions, truncation, conversion and casting between types, "not-a-number" calculations, and how the language handles numbers that are too large or too small for its underlying representation. [REF-7]
- Also be careful to account for 32-bit, 64-bit, and other potential differences that may affect the numeric representation.
Mitigation MIT-8
Strategy: Input Validation
Perform input validation on any numeric input by ensuring that it is within the expected range. Enforce that the input meets both the minimum and maximum requirements for the expected range.
Mitigation MIT-15
For any security checks that are performed on the client side, ensure that these checks are duplicated on the server side, in order to avoid CWE-602. Attackers can bypass the client-side checks by modifying values after the checks have been performed, or by changing the client to remove the client-side checks entirely. Then, these modified values would be submitted to the server.
Mitigation
When processing structured incoming data containing a size field followed by raw data, identify and resolve any inconsistencies between the size field and the actual size of the data (CWE-130).
Mitigation
When allocating memory that uses sentinels to mark the end of a data structure - such as NUL bytes in strings - make sure you also include the sentinel in your calculation of the total amount of memory that must be allocated.
Mitigation MIT-13
Replace unbounded copy functions with analogous functions that support length arguments, such as strcpy with strncpy. Create these if they are not available.
Mitigation
Use sizeof() on the appropriate data type to avoid CWE-467.
Mitigation
Use the appropriate type for the desired action. For example, in C/C++, only use unsigned types for values that could never be negative, such as height, width, or other numbers related to quantity. This will simplify validation and will reduce surprises related to unexpected casting.
Mitigation MIT-4
Strategy: Libraries or Frameworks
- Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid [REF-1482].
- Use libraries or frameworks that make it easier to handle numbers without unexpected consequences, or buffer allocation routines that automatically track buffer size.
- Examples include safe integer handling packages such as SafeInt (C++) or IntegerLib (C or C++). [REF-106]
Mitigation MIT-10
Strategy: Environment Hardening
- Use automatic buffer overflow detection mechanisms that are offered by certain compilers or compiler extensions. Examples include: the Microsoft Visual Studio /GS flag, Fedora/Red Hat FORTIFY_SOURCE GCC flag, StackGuard, and ProPolice, which provide various mechanisms including canary-based detection and range/index checking.
- D3-SFCV (Stack Frame Canary Validation) from D3FEND [REF-1334] discusses canary-based detection in detail.
Mitigation MIT-11
Strategy: Environment Hardening
- Run or compile the software using features or extensions that randomly arrange the positions of a program's executable and libraries in memory. Because this makes the addresses unpredictable, it can prevent an attacker from reliably jumping to exploitable code.
- Examples include Address Space Layout Randomization (ASLR) [REF-58] [REF-60] and Position-Independent Executables (PIE) [REF-64]. Imported modules may be similarly realigned if their default memory addresses conflict with other modules, in a process known as "rebasing" (for Windows) and "prelinking" (for Linux) [REF-1332] using randomly generated addresses. ASLR for libraries cannot be used in conjunction with prelink since it would require relocating the libraries at run-time, defeating the whole purpose of prelinking.
- For more information on these techniques see D3-SAOR (Segment Address Offset Randomization) from D3FEND [REF-1335].
Mitigation MIT-12
Strategy: Environment Hardening
- Use a CPU and operating system that offers Data Execution Protection (using hardware NX or XD bits) or the equivalent techniques that simulate this feature in software, such as PaX [REF-60] [REF-61]. These techniques ensure that any instruction executed is exclusively at a memory address that is part of the code segment.
- For more information on these techniques see D3-PSEP (Process Segment Execution Prevention) from D3FEND [REF-1336].
Mitigation MIT-26
Strategy: Compilation or Build Hardening
Examine compiler warnings closely and eliminate problems with potential security implications, such as signed / unsigned mismatch in memory operations, or use of uninitialized variables. Even if the weakness is rarely exploitable, a single failure may lead to the compromise of the entire system.
Mitigation MIT-17
Strategy: Environment Hardening
Run your code using the lowest privileges that are required to accomplish the necessary tasks [REF-76]. If possible, create isolated accounts with limited privileges that are only used for a single task. That way, a successful attack will not immediately give the attacker access to the rest of the software or its environment. For example, database applications rarely need to run as the database administrator, especially in day-to-day operations.
Mitigation MIT-22
Strategy: Sandbox or Jail
- Run the code in a "jail" or similar sandbox environment that enforces strict boundaries between the process and the operating system. This may effectively restrict which files can be accessed in a particular directory or which commands can be executed by the software.
- OS-level examples include the Unix chroot jail, AppArmor, and SELinux. In general, managed code may provide some protection. For example, java.io.FilePermission in the Java SecurityManager allows the software to specify restrictions on file operations.
- This may not be a feasible solution, and it only limits the impact to the operating system; the rest of the application may still be subject to compromise.
- Be careful to avoid CWE-243 and other weaknesses related to jails.
CAPEC-100: Overflow Buffers
Buffer Overflow attacks target improper or missing bounds checking on buffer operations, typically triggered by input injected by an adversary. As a consequence, an adversary is able to write past the boundaries of allocated buffer regions in memory, causing a program crash or potentially redirection of execution as per the adversaries' choice.
CAPEC-47: Buffer Overflow via Parameter Expansion
In this attack, the target software is given input that the adversary knows will be modified and expanded in size during processing. This attack relies on the target software failing to anticipate that the expanded data may exceed some internal limit, thereby creating a buffer overflow.