""" 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. """
The bug has been referenced in the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=5a56b41c04cd280afebf81c18d91a9deac344357 commit 5a56b41c04cd280afebf81c18d91a9deac344357 Author: Sam James <sam@gentoo.org> AuthorDate: 2025-04-15 02:50:46 +0000 Commit: Sam James <sam@gentoo.org> CommitDate: 2025-04-15 02:55:32 +0000 net-dns/c-ares: add 1.34.5 Bug: https://bugs.gentoo.org/953870 Signed-off-by: Sam James <sam@gentoo.org> net-dns/c-ares/Manifest | 2 + net-dns/c-ares/c-ares-1.34.5.ebuild | 109 ++++++++++++++++++++++++++++++++++++ 2 files changed, 111 insertions(+)
