DEBIAN-CVE-2025-31498
- Source
- https://security-tracker.debian.org/tracker/CVE-2025-31498
- Import Source
- https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2025-31498.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/DEBIAN-CVE-2025-31498
- Upstream
- Published
- 2025-04-08T14:15:35Z
- Modified
- 2025-09-19T06:22:38Z
- 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
Affected packages
Debian:13 / c-ares
Package
- Name
- c-ares
- Purl
- pkg:deb/debian/c-ares?arch=source
Debian:14 / c-ares
Package
- Name
- c-ares
- Purl
- pkg:deb/debian/c-ares?arch=source