Summary
Package updates are available for Amazon Linux 2023 that fix the following vulnerabilities: 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 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.
Fixed packages 10
| Release | Package | Fixed in |
|---|---|---|
| Amazon Linux · 2023 | nodejs20 | 1:20.19.0-1.amzn2023.0.1 |
| Amazon Linux · 2023 | nodejs20-debuginfo | 1:20.19.0-1.amzn2023.0.1 |
| Amazon Linux · 2023 | nodejs20-debugsource | 1:20.19.0-1.amzn2023.0.1 |
| Amazon Linux · 2023 | nodejs20-devel | 1:20.19.0-1.amzn2023.0.1 |
| Amazon Linux · 2023 | nodejs20-docs | 1:20.19.0-1.amzn2023.0.1 |
| Amazon Linux · 2023 | nodejs20-full-i18n | 1:20.19.0-1.amzn2023.0.1 |
| Amazon Linux · 2023 | nodejs20-libs | 1:20.19.0-1.amzn2023.0.1 |
| Amazon Linux · 2023 | nodejs20-libs-debuginfo | 1:20.19.0-1.amzn2023.0.1 |
| Amazon Linux · 2023 | nodejs20-npm | 1:10.8.2-1.20.19.0.1.amzn2023.0.1 |
| Amazon Linux · 2023 | v8-11.3-devel | 3:11.3.244.8-1.20.19.0.1.amzn2023.0.1 |
Vulnerabilities 1
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High 8.3
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 …
References
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web
https://alas.aws.amazon.com/cve/html/CVE-2025-31498.html