CVE-2025-31498
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2025-31498
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-31498.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2025-31498
- Aliases
-
- GHSA-6hxc-62jh-p29v
- Related
- Published
- 2025-04-08T14:15:35Z
- Modified
- 2025-04-11T04:53:27.450955Z
- Downstream
- Summary
- [none]
- Details
-
c-ares is an asynchronous resolver library. From 1.32.3 through 1.34.4, there is a use-after-free in readanswers() when processanswer() 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
-
- https://github.com/c-ares/c-ares/security/advisories/GHSA-6hxc-62jh-p29v
- https://github.com/c-ares/c-ares/commit/29d38719112639d8c0ba910254a3dd4f482ea2d1
- https://github.com/c-ares/c-ares/pull/821
- http://www.openwall.com/lists/oss-security/2025/04/08/3
- https://security.alpinelinux.org/vuln/CVE-2025-31498
- https://security-tracker.debian.org/tracker/CVE-2025-31498
Affected packages
Alpine:v3.21 / c-ares
Package
- Name
- c-ares
- Purl
- pkg:apk/alpine/c-ares?arch=source
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0Unknown introduced version / All previous versions are affectedFixed1.34.5-r0
Affected versions
1.*
Debian:13 / c-ares
Package
- Name
- c-ares
- Purl
- pkg:deb/debian/c-ares?arch=source
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0Unknown introduced version / All previous versions are affectedFixed1.34.5-1
Affected versions
1.*
Git / github.com/c-ares/c-ares
Affected ranges
- Type
- GIT
- Repo
- https://github.com/c-ares/c-ares
- Events
-
Introduced0 Unknown introduced commit / All previous commits are affectedFixed