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usn-6435-1
Vulnerability from osv_ubuntu
Published
2023-10-18 19:51
Modified
2026-06-25 10:46
Summary
openssl vulnerabilities
Details
It was discovered that OpenSSL incorrectly handled excessively large Diffie-Hellman parameters. An attacker could possibly use this issue to cause a denial of service. (CVE-2023-3446)
Bernd Edlinger discovered that OpenSSL incorrectly handled excessively large Diffie-Hellman parameters. An attacker could possibly use this issue to cause a denial of service. (CVE-2023-3817)
References
| URL | Type | |
|---|---|---|
{
"affected": [
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2023-3446",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
"type": "CVSS_V3"
},
{
"score": "low",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2023-3817",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
"type": "CVSS_V3"
},
{
"score": "low",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:Pro:16.04:LTS"
}
},
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "libssl1.0.0",
"binary_version": "1.0.2g-1ubuntu4.20+esm10"
},
{
"binary_name": "openssl",
"binary_version": "1.0.2g-1ubuntu4.20+esm10"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:16.04:LTS",
"name": "openssl",
"purl": "pkg:deb/ubuntu/openssl@1.0.2g-1ubuntu4.20+esm10?arch=source\u0026distro=esm-infra/xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.0.2g-1ubuntu4.20+esm10"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.0.2d-0ubuntu1",
"1.0.2d-0ubuntu2",
"1.0.2e-1ubuntu1",
"1.0.2f-2ubuntu1",
"1.0.2g-1ubuntu2",
"1.0.2g-1ubuntu3",
"1.0.2g-1ubuntu4",
"1.0.2g-1ubuntu4.1",
"1.0.2g-1ubuntu4.2",
"1.0.2g-1ubuntu4.4",
"1.0.2g-1ubuntu4.5",
"1.0.2g-1ubuntu4.6",
"1.0.2g-1ubuntu4.8",
"1.0.2g-1ubuntu4.9",
"1.0.2g-1ubuntu4.10",
"1.0.2g-1ubuntu4.11",
"1.0.2g-1ubuntu4.12",
"1.0.2g-1ubuntu4.13",
"1.0.2g-1ubuntu4.14",
"1.0.2g-1ubuntu4.15",
"1.0.2g-1ubuntu4.16",
"1.0.2g-1ubuntu4.17",
"1.0.2g-1ubuntu4.18",
"1.0.2g-1ubuntu4.19",
"1.0.2g-1ubuntu4.20",
"1.0.2g-1ubuntu4.20+esm1",
"1.0.2g-1ubuntu4.20+esm2",
"1.0.2g-1ubuntu4.20+esm3",
"1.0.2g-1ubuntu4.20+esm4",
"1.0.2g-1ubuntu4.20+esm5",
"1.0.2g-1ubuntu4.20+esm6",
"1.0.2g-1ubuntu4.20+esm7",
"1.0.2g-1ubuntu4.20+esm9"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2023-3446",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
"type": "CVSS_V3"
},
{
"score": "low",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2023-3817",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
"type": "CVSS_V3"
},
{
"score": "low",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:Pro:18.04:LTS"
}
},
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "libssl1.1",
"binary_version": "1.1.1-1ubuntu2.1~18.04.23+esm3"
},
{
"binary_name": "openssl",
"binary_version": "1.1.1-1ubuntu2.1~18.04.23+esm3"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:18.04:LTS",
"name": "openssl",
"purl": "pkg:deb/ubuntu/openssl@1.1.1-1ubuntu2.1~18.04.23+esm3?arch=source\u0026distro=esm-infra/bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.1.1-1ubuntu2.1~18.04.23+esm3"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.0.2g-1ubuntu13",
"1.0.2g-1ubuntu14",
"1.0.2n-1ubuntu1",
"1.1.0g-2ubuntu1",
"1.1.0g-2ubuntu2",
"1.1.0g-2ubuntu3",
"1.1.0g-2ubuntu4",
"1.1.0g-2ubuntu4.1",
"1.1.0g-2ubuntu4.3",
"1.1.1-1ubuntu2.1~18.04.1",
"1.1.1-1ubuntu2.1~18.04.2",
"1.1.1-1ubuntu2.1~18.04.3",
"1.1.1-1ubuntu2.1~18.04.4",
"1.1.1-1ubuntu2.1~18.04.5",
"1.1.1-1ubuntu2.1~18.04.6",
"1.1.1-1ubuntu2.1~18.04.7",
"1.1.1-1ubuntu2.1~18.04.8",
"1.1.1-1ubuntu2.1~18.04.9",
"1.1.1-1ubuntu2.1~18.04.10",
"1.1.1-1ubuntu2.1~18.04.13",
"1.1.1-1ubuntu2.1~18.04.14",
"1.1.1-1ubuntu2.1~18.04.15",
"1.1.1-1ubuntu2.1~18.04.17",
"1.1.1-1ubuntu2.1~18.04.19",
"1.1.1-1ubuntu2.1~18.04.20",
"1.1.1-1ubuntu2.1~18.04.21",
"1.1.1-1ubuntu2.1~18.04.22",
"1.1.1-1ubuntu2.1~18.04.23",
"1.1.1-1ubuntu2.1~18.04.23+esm1"
]
}
],
"aliases": [],
"details": "It was discovered that OpenSSL incorrectly handled excessively large\nDiffie-Hellman parameters. An attacker could possibly use this issue\nto cause a denial of service. (CVE-2023-3446)\n\nBernd Edlinger discovered that OpenSSL incorrectly handled excessively\nlarge Diffie-Hellman parameters. An attacker could possibly use this\nissue to cause a denial of service. (CVE-2023-3817)\n",
"id": "USN-6435-1",
"modified": "2026-06-25T10:46:16Z",
"published": "2023-10-18T19:51:24Z",
"references": [
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-6435-1"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2023-3446"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2023-3817"
}
],
"related": [],
"schema_version": "1.7.0",
"summary": "openssl vulnerabilities",
"upstream": [
"UBUNTU-CVE-2023-3446",
"UBUNTU-CVE-2023-3817"
]
}
ubuntu-cve-2023-3446
Vulnerability from osv_ubuntu
Published
2023-07-19 12:15
Modified
2026-04-22 07:45
Summary
Details
Issue summary: Checking excessively long DH keys or parameters may be very slow. Impact summary: Applications that use the functions DH_check(), DH_check_ex() or EVP_PKEY_param_check() to check a DH key or DH parameters may experience long delays. Where the key or parameters that are being checked have been obtained from an untrusted source this may lead to a Denial of Service. The function DH_check() performs various checks on DH parameters. One of those checks confirms that the modulus ('p' parameter) is not too large. Trying to use a very large modulus is slow and OpenSSL will not normally use a modulus which is over 10,000 bits in length. However the DH_check() function checks numerous aspects of the key or parameters that have been supplied. Some of those checks use the supplied modulus value even if it has already been found to be too large. An application that calls DH_check() and supplies a key or parameters obtained from an untrusted source could be vulernable to a Denial of Service attack. The function DH_check() is itself called by a number of other OpenSSL functions. An application calling any of those other functions may similarly be affected. The other functions affected by this are DH_check_ex() and EVP_PKEY_param_check(). Also vulnerable are the OpenSSL dhparam and pkeyparam command line applications when using the '-check' option. The OpenSSL SSL/TLS implementation is not affected by this issue. The OpenSSL 3.0 and 3.1 FIPS providers are not affected by this issue.
Severity
5.3 (Medium)
5.3 (Medium)
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "libssl1.0.0",
"binary_version": "1.0.1f-1ubuntu2.27+esm10"
},
{
"binary_name": "openssl",
"binary_version": "1.0.1f-1ubuntu2.27+esm10"
}
],
"priority_reason": "Upstream openssl developers have rated this issue as being low severity"
},
"package": {
"ecosystem": "Ubuntu:Pro:14.04:LTS",
"name": "openssl",
"purl": "pkg:deb/ubuntu/openssl@1.0.1f-1ubuntu2.27+esm10?arch=source\u0026distro=trusty/esm"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.0.1f-1ubuntu2.27+esm10"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.0.1e-3ubuntu1",
"1.0.1e-4ubuntu1",
"1.0.1e-4ubuntu2",
"1.0.1e-4ubuntu3",
"1.0.1e-4ubuntu4",
"1.0.1f-1ubuntu1",
"1.0.1f-1ubuntu2",
"1.0.1f-1ubuntu2.1",
"1.0.1f-1ubuntu2.2",
"1.0.1f-1ubuntu2.3",
"1.0.1f-1ubuntu2.4",
"1.0.1f-1ubuntu2.5",
"1.0.1f-1ubuntu2.7",
"1.0.1f-1ubuntu2.8",
"1.0.1f-1ubuntu2.11",
"1.0.1f-1ubuntu2.12",
"1.0.1f-1ubuntu2.15",
"1.0.1f-1ubuntu2.16",
"1.0.1f-1ubuntu2.17",
"1.0.1f-1ubuntu2.18",
"1.0.1f-1ubuntu2.19",
"1.0.1f-1ubuntu2.20",
"1.0.1f-1ubuntu2.21",
"1.0.1f-1ubuntu2.22",
"1.0.1f-1ubuntu2.23",
"1.0.1f-1ubuntu2.24",
"1.0.1f-1ubuntu2.25",
"1.0.1f-1ubuntu2.26",
"1.0.1f-1ubuntu2.27",
"1.0.1f-1ubuntu2.27+esm1",
"1.0.1f-1ubuntu2.27+esm2",
"1.0.1f-1ubuntu2.27+esm3",
"1.0.1f-1ubuntu2.27+esm4",
"1.0.1f-1ubuntu2.27+esm5",
"1.0.1f-1ubuntu2.27+esm6",
"1.0.1f-1ubuntu2.27+esm7",
"1.0.1f-1ubuntu2.27+esm9"
]
},
{
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "libssl1.0.0",
"binary_version": "1.0.2g-1ubuntu4.20+esm10"
},
{
"binary_name": "openssl",
"binary_version": "1.0.2g-1ubuntu4.20+esm10"
}
],
"priority_reason": "Upstream openssl developers have rated this issue as being low severity"
},
"package": {
"ecosystem": "Ubuntu:Pro:16.04:LTS",
"name": "openssl",
"purl": "pkg:deb/ubuntu/openssl@1.0.2g-1ubuntu4.20+esm10?arch=source\u0026distro=esm-infra/xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.0.2g-1ubuntu4.20+esm10"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.0.2d-0ubuntu1",
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"1.0.2g-1ubuntu4",
"1.0.2g-1ubuntu4.1",
"1.0.2g-1ubuntu4.2",
"1.0.2g-1ubuntu4.4",
"1.0.2g-1ubuntu4.5",
"1.0.2g-1ubuntu4.6",
"1.0.2g-1ubuntu4.8",
"1.0.2g-1ubuntu4.9",
"1.0.2g-1ubuntu4.10",
"1.0.2g-1ubuntu4.11",
"1.0.2g-1ubuntu4.12",
"1.0.2g-1ubuntu4.13",
"1.0.2g-1ubuntu4.14",
"1.0.2g-1ubuntu4.15",
"1.0.2g-1ubuntu4.16",
"1.0.2g-1ubuntu4.17",
"1.0.2g-1ubuntu4.18",
"1.0.2g-1ubuntu4.19",
"1.0.2g-1ubuntu4.20",
"1.0.2g-1ubuntu4.20+esm1",
"1.0.2g-1ubuntu4.20+esm2",
"1.0.2g-1ubuntu4.20+esm3",
"1.0.2g-1ubuntu4.20+esm4",
"1.0.2g-1ubuntu4.20+esm5",
"1.0.2g-1ubuntu4.20+esm6",
"1.0.2g-1ubuntu4.20+esm7",
"1.0.2g-1ubuntu4.20+esm9"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "ovmf",
"binary_version": "0~20160408.ffea0a2c-2ubuntu0.2+esm3"
},
{
"binary_name": "qemu-efi",
"binary_version": "0~20160408.ffea0a2c-2ubuntu0.2+esm3"
}
],
"priority_reason": "Upstream openssl developers have rated this issue as being low severity"
},
"package": {
"ecosystem": "Ubuntu:Pro:16.04:LTS",
"name": "edk2",
"purl": "pkg:deb/ubuntu/edk2@0~20160408.ffea0a2c-2ubuntu0.2+esm3?arch=source\u0026distro=esm-apps/xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0~20150106.5c2d456b-2",
"0~20160104.c2a892d7-1",
"0~20160408.ffea0a2c-2",
"0~20160408.ffea0a2c-2ubuntu0.1",
"0~20160408.ffea0a2c-2ubuntu0.2",
"0~20160408.ffea0a2c-2ubuntu0.2+esm1",
"0~20160408.ffea0a2c-2ubuntu0.2+esm3"
]
},
{
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "libssl1.0.0",
"binary_version": "1.0.2g-1ubuntu4.fips.4.20.10"
},
{
"binary_name": "libssl1.0.0-hmac",
"binary_version": "1.0.2g-1ubuntu4.fips.4.20.10"
},
{
"binary_name": "openssl",
"binary_version": "1.0.2g-1ubuntu4.fips.4.20.10"
}
],
"priority_reason": "Upstream openssl developers have rated this issue as being low severity"
},
"package": {
"ecosystem": "Ubuntu:Pro:FIPS:16.04:LTS",
"name": "openssl",
"purl": "pkg:deb/ubuntu/openssl@1.0.2g-1ubuntu4.fips.4.20.10?arch=source\u0026distro=fips-updates/xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.0.2g-1ubuntu4.fips.4.20.10"
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],
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}
],
"versions": [
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"1.0.2g-1ubuntu4.fips.4.18.1",
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"1.0.2g-1ubuntu4.fips.4.20.9"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libssl1.0.0",
"binary_version": "1.0.2g-1ubuntu4.fips.4.6.3"
},
{
"binary_name": "libssl1.0.0-hmac",
"binary_version": "1.0.2g-1ubuntu4.fips.4.6.3"
},
{
"binary_name": "openssl",
"binary_version": "1.0.2g-1ubuntu4.fips.4.6.3"
}
],
"priority_reason": "Upstream openssl developers have rated this issue as being low severity"
},
"package": {
"ecosystem": "Ubuntu:Pro:FIPS:16.04:LTS",
"name": "openssl",
"purl": "pkg:deb/ubuntu/openssl@1.0.2g-1ubuntu4.fips.4.6.3?arch=source\u0026distro=fips/xenial"
},
"ranges": [
{
"events": [
{
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}
],
"type": "ECOSYSTEM"
}
],
"versions": [
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"1.0.2g-1ubuntu4.fips.4.6~ppa2",
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]
},
{
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "libssl1.1",
"binary_version": "1.1.1-1ubuntu2.1~18.04.23+esm3"
},
{
"binary_name": "openssl",
"binary_version": "1.1.1-1ubuntu2.1~18.04.23+esm3"
}
],
"priority_reason": "Upstream openssl developers have rated this issue as being low severity"
},
"package": {
"ecosystem": "Ubuntu:Pro:18.04:LTS",
"name": "openssl",
"purl": "pkg:deb/ubuntu/openssl@1.1.1-1ubuntu2.1~18.04.23+esm3?arch=source\u0026distro=esm-infra/bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.1.1-1ubuntu2.1~18.04.23+esm3"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
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"1.0.2g-1ubuntu14",
"1.0.2n-1ubuntu1",
"1.1.0g-2ubuntu1",
"1.1.0g-2ubuntu2",
"1.1.0g-2ubuntu3",
"1.1.0g-2ubuntu4",
"1.1.0g-2ubuntu4.1",
"1.1.0g-2ubuntu4.3",
"1.1.1-1ubuntu2.1~18.04.1",
"1.1.1-1ubuntu2.1~18.04.2",
"1.1.1-1ubuntu2.1~18.04.3",
"1.1.1-1ubuntu2.1~18.04.4",
"1.1.1-1ubuntu2.1~18.04.5",
"1.1.1-1ubuntu2.1~18.04.6",
"1.1.1-1ubuntu2.1~18.04.7",
"1.1.1-1ubuntu2.1~18.04.8",
"1.1.1-1ubuntu2.1~18.04.9",
"1.1.1-1ubuntu2.1~18.04.10",
"1.1.1-1ubuntu2.1~18.04.13",
"1.1.1-1ubuntu2.1~18.04.14",
"1.1.1-1ubuntu2.1~18.04.15",
"1.1.1-1ubuntu2.1~18.04.17",
"1.1.1-1ubuntu2.1~18.04.19",
"1.1.1-1ubuntu2.1~18.04.20",
"1.1.1-1ubuntu2.1~18.04.21",
"1.1.1-1ubuntu2.1~18.04.22",
"1.1.1-1ubuntu2.1~18.04.23",
"1.1.1-1ubuntu2.1~18.04.23+esm1"
]
},
{
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "libssl1.0.0",
"binary_version": "1.0.2n-1ubuntu5.13+esm1"
},
{
"binary_name": "openssl1.0",
"binary_version": "1.0.2n-1ubuntu5.13+esm1"
}
],
"priority_reason": "Upstream openssl developers have rated this issue as being low severity"
},
"package": {
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"aliases": [],
"details": "Issue summary: Checking excessively long DH keys or parameters may be very slow. Impact summary: Applications that use the functions DH_check(), DH_check_ex() or EVP_PKEY_param_check() to check a DH key or DH parameters may experience long delays. Where the key or parameters that are being checked have been obtained from an untrusted source this may lead to a Denial of Service. The function DH_check() performs various checks on DH parameters. One of those checks confirms that the modulus (\u0027p\u0027 parameter) is not too large. Trying to use a very large modulus is slow and OpenSSL will not normally use a modulus which is over 10,000 bits in length. However the DH_check() function checks numerous aspects of the key or parameters that have been supplied. Some of those checks use the supplied modulus value even if it has already been found to be too large. An application that calls DH_check() and supplies a key or parameters obtained from an untrusted source could be vulernable to a Denial of Service attack. The function DH_check() is itself called by a number of other OpenSSL functions. An application calling any of those other functions may similarly be affected. The other functions affected by this are DH_check_ex() and EVP_PKEY_param_check(). Also vulnerable are the OpenSSL dhparam and pkeyparam command line applications when using the \u0027-check\u0027 option. The OpenSSL SSL/TLS implementation is not affected by this issue. The OpenSSL 3.0 and 3.1 FIPS providers are not affected by this issue.",
"id": "UBUNTU-CVE-2023-3446",
"modified": "2026-04-22T07:45:02Z",
"published": "2023-07-19T12:15:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2023-3446"
},
{
"type": "REPORT",
"url": "https://www.openssl.org/news/secadv/20230719.txt"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-6435-1"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-6450-1"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-6435-2"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-6709-1"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2023-3446"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-7018-1"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-7894-1"
}
],
"related": [
"USN-6435-1",
"USN-6450-1",
"USN-6435-2",
"USN-6709-1",
"USN-7018-1",
"USN-7894-1"
],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
"type": "CVSS_V3"
},
{
"score": "low",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2023-3446"
]
}
ubuntu-cve-2023-3817
Vulnerability from osv_ubuntu
Published
2023-07-31 16:15
Modified
2026-04-22 07:45
Summary
Details
Issue summary: Checking excessively long DH keys or parameters may be very slow. Impact summary: Applications that use the functions DH_check(), DH_check_ex() or EVP_PKEY_param_check() to check a DH key or DH parameters may experience long delays. Where the key or parameters that are being checked have been obtained from an untrusted source this may lead to a Denial of Service. The function DH_check() performs various checks on DH parameters. After fixing CVE-2023-3446 it was discovered that a large q parameter value can also trigger an overly long computation during some of these checks. A correct q value, if present, cannot be larger than the modulus p parameter, thus it is unnecessary to perform these checks if q is larger than p. An application that calls DH_check() and supplies a key or parameters obtained from an untrusted source could be vulnerable to a Denial of Service attack. The function DH_check() is itself called by a number of other OpenSSL functions. An application calling any of those other functions may similarly be affected. The other functions affected by this are DH_check_ex() and EVP_PKEY_param_check(). Also vulnerable are the OpenSSL dhparam and pkeyparam command line applications when using the "-check" option. The OpenSSL SSL/TLS implementation is not affected by this issue. The OpenSSL 3.0 and 3.1 FIPS providers are not affected by this issue.
Severity
5.3 (Medium)
5.3 (Medium)
N/A (UNKNOWN)
References
| URL | Type | |||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||||||||||||||
{
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{
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{
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{
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{
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{
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],
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]
},
{
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{
"binary_name": "qemu-efi",
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{
"binary_name": "qemu-efi-aarch64",
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{
"binary_name": "qemu-efi-arm",
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],
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},
{
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"1.1.1-1ubuntu2.fips.2.1~18.04.22",
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]
},
{
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{
"binary_name": "libssl1.1-hmac",
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{
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],
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},
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{
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],
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],
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{
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},
{
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},
{
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"binary_name": "libnode72",
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{
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"name": "nodejs",
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},
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{
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"package": {
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],
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"package": {
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},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "efi-shell-aa64",
"binary_version": "2024.02-2ubuntu0.6"
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{
"binary_name": "efi-shell-arm",
"binary_version": "2024.02-2ubuntu0.6"
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{
"binary_name": "efi-shell-ia32",
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"versions": [
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"2023.11-2",
"2023.11-3",
"2023.11-4",
"2023.11-5",
"2023.11-6",
"2023.11-8",
"2024.02-1",
"2024.02-2",
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"2024.02-2ubuntu0.3",
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],
"aliases": [],
"details": "Issue summary: Checking excessively long DH keys or parameters may be very slow. Impact summary: Applications that use the functions DH_check(), DH_check_ex() or EVP_PKEY_param_check() to check a DH key or DH parameters may experience long delays. Where the key or parameters that are being checked have been obtained from an untrusted source this may lead to a Denial of Service. The function DH_check() performs various checks on DH parameters. After fixing CVE-2023-3446 it was discovered that a large q parameter value can also trigger an overly long computation during some of these checks. A correct q value, if present, cannot be larger than the modulus p parameter, thus it is unnecessary to perform these checks if q is larger than p. An application that calls DH_check() and supplies a key or parameters obtained from an untrusted source could be vulnerable to a Denial of Service attack. The function DH_check() is itself called by a number of other OpenSSL functions. An application calling any of those other functions may similarly be affected. The other functions affected by this are DH_check_ex() and EVP_PKEY_param_check(). Also vulnerable are the OpenSSL dhparam and pkeyparam command line applications when using the \"-check\" option. The OpenSSL SSL/TLS implementation is not affected by this issue. The OpenSSL 3.0 and 3.1 FIPS providers are not affected by this issue.",
"id": "UBUNTU-CVE-2023-3817",
"modified": "2026-04-22T07:45:03Z",
"published": "2023-07-31T16:15:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2023-3817"
},
{
"type": "REPORT",
"url": "https://www.openssl.org/news/secadv/20230731.txt"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-6435-1"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-6450-1"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-6435-2"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-6709-1"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2023-3817"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-7894-1"
}
],
"related": [
"USN-6435-1",
"USN-6450-1",
"USN-6435-2",
"USN-6709-1",
"USN-7894-1"
],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
"type": "CVSS_V3"
},
{
"score": "low",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2023-3817"
]
}
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Trend slope:
-
(linear fit over daily sighting counts)
Show additional events:
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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