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.
EPSS: 0.004 (31.7th percentile) — read the EPSS interpretation.
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.
Affected products
- C-ares — versions < 1.19.1
- C-ares_project C-ares
- Debian Debian_linux — versions 10.0, 11.0
- Fedoraproject Fedora — versions 37, 38
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security-advisories@github.com (x_refsource_CONFIRM, Third Party Advisory)
- security-advisories@github.com (x_refsource_MISC, Release Notes)
- security-advisories@github.com (Mailing List, Third Party Advisory)
- security-advisories@github.com (Mailing List, Third Party Advisory)
- security-advisories@github.com (Third Party Advisory)
- security-advisories@github.com (Mailing List)
- security-advisories@github.com (Third Party Advisory)
- security-advisories@github.com
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.