Buffer overflow in C-Ares
CVE-2023-31130
c-ares is an asynchronous resolver library. ares_inet_net_pton() is vulnerable to a buffer underflow for certain ipv6 addresses, in particular "0::00:00:00/2" was found to cause an issue. C-ares only uses this function internally for configuration purposes which would require an administrator to configure such an address via ares_set_sortlist(). However, users may externally use ares_inet_net_pton() for other purposes and thus be vulnerable to more severe issues. This issue has been fixed in 1.19.1.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.1 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.004 (30.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 31st percentile — 30.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: -0.000
Affected products
- C-Ares — versions < 1.19.1
- C-Ares Project
- Debian Linux — versions 10.0, 11.0
- Fedoraproject Fedora — versions 37, 38
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/c-ares/c-ares/security/advisories/GHSA-x6mf-cxr9-8q6v (Third Party Advisory)
- github.com/c-ares/c-ares/releases/tag/cares-1_19_1 (Release Notes)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (Mailing List, Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (Mailing List, Third Party Advisory)
- www.debian.org/security/2023/dsa-5419 (Third Party Advisory)
- lists.debian.org/debian-lts-announce/2023/06/msg00034.html (Mailing List)
- security.gentoo.org/glsa/202310-09 (Third Party Advisory)
- security.netapp.com/advisory/ntap-20240605-0005/
Frequently asked questions
- What is CVE-2023-31130?
- CVE-2023-31130 is a medium-severity vulnerability in C-Ares, classified under Buffer Underwrite. CVSS score: 4.1/10. Published 2023-05-25.
- How severe is CVE-2023-31130?
- Medium severity. CVSS v3 base score is 4.1 out of 10.
- Is CVE-2023-31130 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.