ubuntu-cve-2023-31137
Vulnerability from osv_ubuntu
Published
2023-05-09 14:15
Modified
2025-09-08 16:56
Summary
Details
MaraDNS is open-source software that implements the Domain Name System (DNS). In version 3.5.0024 and prior, a remotely exploitable integer underflow vulnerability in the DNS packet decompression function allows an attacker to cause a Denial of Service by triggering an abnormal program termination. The vulnerability exists in the decomp_get_rddata function within the Decompress.c file. When handling a DNS packet with an Answer RR of qtype 16 (TXT record) and any qclass, if the rdlength is smaller than rdata, the result of the line Decompress.c:886 is a negative number len = rdlength - total;. This value is then passed to the decomp_append_bytes function without proper validation, causing the program to attempt to allocate a massive chunk of memory that is impossible to allocate. Consequently, the program exits with an error code of 64, causing a Denial of Service. One proposed fix for this vulnerability is to patch Decompress.c:887 by breaking if(len <= 0), which has been incorporated in version 3.5.0036 via commit bab062bde40b2ae8a91eecd522e84d8b993bab58.
Severity
7.5 (High)
7.5 (High)
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "duende",
"binary_version": "2.0.13-1ubuntu0.1~esm1"
},
{
"binary_name": "maradns",
"binary_version": "2.0.13-1ubuntu0.1~esm1"
},
{
"binary_name": "maradns-deadwood",
"binary_version": "2.0.13-1ubuntu0.1~esm1"
},
{
"binary_name": "maradns-docs",
"binary_version": "2.0.13-1ubuntu0.1~esm1"
},
{
"binary_name": "maradns-zoneserver",
"binary_version": "2.0.13-1ubuntu0.1~esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:16.04:LTS",
"name": "maradns",
"purl": "pkg:deb/ubuntu/maradns@2.0.13-1ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.0.13-1ubuntu0.1~esm1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.0.11-1",
"2.0.13-1"
]
},
{
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "duende",
"binary_version": "2.0.13-1.2ubuntu0.1~esm1"
},
{
"binary_name": "maradns",
"binary_version": "2.0.13-1.2ubuntu0.1~esm1"
},
{
"binary_name": "maradns-deadwood",
"binary_version": "2.0.13-1.2ubuntu0.1~esm1"
},
{
"binary_name": "maradns-docs",
"binary_version": "2.0.13-1.2ubuntu0.1~esm1"
},
{
"binary_name": "maradns-zoneserver",
"binary_version": "2.0.13-1.2ubuntu0.1~esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:18.04:LTS",
"name": "maradns",
"purl": "pkg:deb/ubuntu/maradns@2.0.13-1.2ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.0.13-1.2ubuntu0.1~esm1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.0.13-1.2"
]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "duende",
"binary_version": "2.0.13-1.4+deb11u1build0.20.04.1"
},
{
"binary_name": "maradns",
"binary_version": "2.0.13-1.4+deb11u1build0.20.04.1"
},
{
"binary_name": "maradns-deadwood",
"binary_version": "2.0.13-1.4+deb11u1build0.20.04.1"
},
{
"binary_name": "maradns-docs",
"binary_version": "2.0.13-1.4+deb11u1build0.20.04.1"
},
{
"binary_name": "maradns-zoneserver",
"binary_version": "2.0.13-1.4+deb11u1build0.20.04.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "maradns",
"purl": "pkg:deb/ubuntu/maradns@2.0.13-1.4+deb11u1build0.20.04.1?arch=source\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.0.13-1.4+deb11u1build0.20.04.1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.0.13-1.2build1",
"2.0.13-1.4",
"2.0.13-1.4build1"
]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "duende",
"binary_version": "2.0.13-1.4+deb11u1build0.22.04.1"
},
{
"binary_name": "maradns",
"binary_version": "2.0.13-1.4+deb11u1build0.22.04.1"
},
{
"binary_name": "maradns-deadwood",
"binary_version": "2.0.13-1.4+deb11u1build0.22.04.1"
},
{
"binary_name": "maradns-docs",
"binary_version": "2.0.13-1.4+deb11u1build0.22.04.1"
},
{
"binary_name": "maradns-zoneserver",
"binary_version": "2.0.13-1.4+deb11u1build0.22.04.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "maradns",
"purl": "pkg:deb/ubuntu/maradns@2.0.13-1.4+deb11u1build0.22.04.1?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.0.13-1.4+deb11u1build0.22.04.1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.0.13-1.4build2"
]
}
],
"aliases": [],
"details": "MaraDNS is open-source software that implements the Domain Name System (DNS). In version 3.5.0024 and prior, a remotely exploitable integer underflow vulnerability in the DNS packet decompression function allows an attacker to cause a Denial of Service by triggering an abnormal program termination. The vulnerability exists in the `decomp_get_rddata` function within the `Decompress.c` file. When handling a DNS packet with an Answer RR of qtype 16 (TXT record) and any qclass, if the `rdlength` is smaller than `rdata`, the result of the line `Decompress.c:886` is a negative number `len = rdlength - total;`. This value is then passed to the `decomp_append_bytes` function without proper validation, causing the program to attempt to allocate a massive chunk of memory that is impossible to allocate. Consequently, the program exits with an error code of 64, causing a Denial of Service. One proposed fix for this vulnerability is to patch `Decompress.c:887` by breaking `if(len \u003c= 0)`, which has been incorporated in version 3.5.0036 via commit bab062bde40b2ae8a91eecd522e84d8b993bab58.",
"id": "UBUNTU-CVE-2023-31137",
"modified": "2025-09-08T16:56:16Z",
"published": "2023-05-09T14:15:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2023-31137"
},
{
"type": "REPORT",
"url": "https://github.com/samboy/MaraDNS/security/advisories/GHSA-58m7-826v-9c3c"
},
{
"type": "REPORT",
"url": "https://github.com/samboy/MaraDNS/commit/bab062bde40b2ae8a91eecd522e84d8b993bab58"
},
{
"type": "REPORT",
"url": "https://github.com/samboy/MaraDNS/blob/08b21ea20d80cedcb74aa8f14979ec7c61846663/dns/Decompress.c#L886"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-6271-1"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2023-31137"
}
],
"related": [
"USN-6271-1"
],
"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:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2023-31137"
]
}
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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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