CVE-2025-31498 (GCVE-0-2025-31498)
Vulnerability from cvelistv5
Published
2025-04-08 13:53
Modified
2025-04-08 18:40
Severity ?
8.3 (High) - CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N
CWE
Summary
c-ares is an asynchronous resolver library. From 1.32.3 through 1.34.4, there is a use-after-free in read_answers() when process_answer() may re-enqueue a query either due to a DNS Cookie Failure or when the upstream server does not properly support EDNS, or possibly on TCP queries if the remote closed the connection immediately after a response. If there was an issue trying to put that new transaction on the wire, it would close the connection handle, but read_answers() was still expecting the connection handle to be available to possibly dequeue other responses. In theory a remote attacker might be able to trigger this by flooding the target with ICMP UNREACHABLE packets if they also control the upstream nameserver and can return a result with one of those conditions, this has been untested. Otherwise only a local attacker might be able to change system behavior to make send()/write() return a failure condition. This vulnerability is fixed in 1.34.5.
References
security-advisories@github.comhttps://github.com/c-ares/c-ares/commit/29d38719112639d8c0ba910254a3dd4f482ea2d1
security-advisories@github.comhttps://github.com/c-ares/c-ares/pull/821
security-advisories@github.comhttps://github.com/c-ares/c-ares/security/advisories/GHSA-6hxc-62jh-p29v
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2025/04/08/3
Impacted products
Vendor Product Version
c-ares c-ares Version: >= 1.32.3, < 1.34.5
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