Resource exhaustion in C-Ares
CVE-2023-32067
c-ares is an asynchronous resolver library. c-ares is vulnerable to denial of service. If a target resolver sends a query, the attacker forges a malformed UDP packet with a length of 0 and returns them to the target resolver. The target resolver erroneously interprets the 0 length as a graceful shutdown of the connection. This issue has been patched in version 1.19.1.
Vulnerability class: DoS (Denial of Service)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.016 (74.9th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 75th percentile — 74.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.016 · newest: 0.016 · 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-9g78-jv2r-p7vc (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-20240605-0004/
Frequently asked questions
- What is CVE-2023-32067?
- CVE-2023-32067 is a high-severity vulnerability in C-Ares, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2023-05-25.
- How severe is CVE-2023-32067?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2023-32067 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.