CVE-2025-31498— c-ares 资源管理错误漏洞

c-ares has a use-after-free in read_answers()

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.

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释放后使用

c-ares 资源管理错误漏洞

c-ares是c-ares个人开发者的一个用于异步 DNS 请求的 C 库。 c-ares 1.32.3版本至1.34.4版本存在资源管理错误漏洞，该漏洞源于释放后重用，可能导致远程攻击者触发拒绝服务。

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