- Description
- 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.
- Source
- security-advisories@github.com
- NVD status
- Awaiting Analysis
CVSS 4.0
- Type
- Secondary
- Base score
- 8.3
- Impact score
- -
- Exploitability score
- -
- Vector string
- 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
- Severity
- HIGH
- security-advisories@github.com
- CWE-416
- Hype score
- Not currently trending
🔥 URGENT: Node.js 22.15.0 on Fedora 41 fixes a critical use-after-free exploit (CVE-2025-31498). 💻 Risk: RCE via c-ares DNS handling. ⚡ Fix: sudo dnf upgrade --advisory FEDORA-2025-2c1f4c46d0 Read 👉 https://t.co/zdfvUDu634 #LinuxSecurity #NodeJS https://t.co/
@Cezar_H_Linux
11 May 2025
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🚨 Breaking: CVE-2025-31498 exposes Ubuntu 25.04/24.10 to DoS attacks via c-ares DNS flaw. 💻 Patch immediately: sudo apt upgrade libcares2 🔗 Full analysis: 👉 https://t.co/wmijIHC3ED #Ubuntu #Security https://t.co/ixLQZAJ6Y9
@Cezar_H_Linux
5 May 2025
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CVE-2025-31498 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 eithe… https://t.co/X2l4f1Suc0
@CVEnew
8 Apr 2025
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[CVE-2025-31498: HIGH] Vulnerability in c-ares 1.32.3 through 1.34.4 may allow a remote attacker to exploit use-after-free issue in read_answers(). Update to 1.34.5 to fix this cyber security threat.#cybersecurity,#vulnerability https://t.co/sLTrHZOPXy https://t.co/UJC5R74f20
@CveFindCom
8 Apr 2025
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CVE-2025-31498: c-ares: Use-after-free in read_answers() https://t.co/IHUYvpPCTs Versions 1.32.3 - 1.34.4 are affected. Patch in 1.34.5. c-ares started handling UDP write failures in 1.32.3, thus uncovering this particular issue.
@oss_security
8 Apr 2025
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