CVE-2023-31137: MaraDNS Integer Underflow Vulnerability in DNS Packet Decompression
First published: Tue May 09 2023(Updated: )
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.
Credit: security-advisories@github.com security-advisories@github.com security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Maradns Maradns | <=3.5.0024 | |
| debian/maradns | <=2.0.13-1.4<=2.0.13-1.2 | 2.0.13-1.4+deb11u1 2.0.13-1.5 |
| ubuntu/maradns | <2.0.13-1.4+ | 2.0.13-1.4+ |
| ubuntu/maradns | <2.0.13-1ubuntu0.1~ | 2.0.13-1ubuntu0.1~ |
| ubuntu/maradns | <2.0.13-1.2ubuntu0.1~ | 2.0.13-1.2ubuntu0.1~ |
| ubuntu/maradns | <2.0.13-1.4+ | 2.0.13-1.4+ |
| ubuntu/maradns | <2.0.13-1.4+ | 2.0.13-1.4+ |
| debian/maradns | <=2.0.13-1.2 | 2.0.13-1.2+deb10u1 2.0.13-1.4+deb11u1 2.0.13-1.6 |
| Maradns Maradns | <3.4.10 | |
| Maradns Maradns | >=3.5.0001<3.5.0036 | |
| Fedoraproject Fedora | =37 | |
| Fedoraproject Fedora | =38 | |
| Debian Debian Linux | =10.0 | |
| Debian Debian Linux | =11.0 |
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Reference Links
- https://security-tracker.debian.org/tracker/CVE-2023-31137
- https://github.com/samboy/MaraDNS/commit/bab062bde40b2ae8a91eecd522e84d8b993bab58
- https://github.com/samboy/MaraDNS/security/advisories/GHSA-58m7-826v-9c3c
- https://www.cve.org/CVERecord?id=CVE-2023-31137
- https://security-tracker.debian.org/tracker/CVE-2022-30256
- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1035936
- https://github.com/samboy/MaraDNS/blob/08b21ea20d80cedcb74aa8f14979ec7c61846663/dns/Decompress.c#L886
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/NB7LDZM5AGWC5BHHQHW6CP5OFNBBKFOQ/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3VSMLJX25MXGQ6A7UPOGK7VPUVDESPHL/
- https://lists.debian.org/debian-lts-announce/2023/06/msg00019.html
- https://www.debian.org/security/2023/dsa-5441
- https://launchpad.net/bugs/cve/CVE-2023-31137
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-31137
- https://ubuntu.com/security/notices/USN-6271-1
- https://nvd.nist.gov/vuln/detail/CVE-2023-31137
- https://ubuntu.com/security/CVE-2023-31137
- collector/nvd-index
- collector/debian-bugs
- alias/CVE-2023-31137
- agent/type
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- package-manager/debian
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- version/maradns maradns/3.5.0001
- vendor/fedoraproject
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- version/fedoraproject fedora/37
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- version/debian debian linux/11.0