MaraDNS Integer Underflow Vulnerability in DNS Packet Decompression
Résumé
MaraDNS Integer Underflow Vulnerability in DNS Packet Decompression
Description d'origine
La description telle que publiée par la source (souvent en anglais).
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.
Source: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV
État des correctifs par distribution
Paquets corrigés publiés par chaque distribution pour cette CVE
- Debian DEBIAN-CVE-2023-31137 maradns Corrigé dans: 2.0.13-1.4+deb11u1
Références
- advisory github.com
- advisory github.com
- advisory nvd.nist.gov
- advisory debian.org
- patch github.com
- web github.com
- web lists.debian.org
- web lists.fedoraproject.org
- web lists.fedoraproject.org