| Name | CVE-2023-49288 |
| Description | Squid is a caching proxy for the Web supporting HTTP, HTTPS, FTP, and more. Affected versions of squid are subject to a a Use-After-Free bug which can lead to a Denial of Service attack via collapsed forwarding. All versions of Squid from 3.5 up to and including 5.9 configured with "collapsed_forwarding on" are vulnerable. Configurations with "collapsed_forwarding off" or without a "collapsed_forwarding" directive are not vulnerable. This bug is fixed by Squid version 6.0.1. Users are advised to upgrade. Users unable to upgrade should remove all collapsed_forwarding lines from their squid.conf. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| squid (PTS) | buster (security), buster, buster (lts) | 4.6-1+deb10u10 | vulnerable |
| bullseye (security), bullseye | 4.13-10+deb11u3 | vulnerable |
| bookworm (security), bookworm | 5.7-2+deb12u2 | vulnerable |
| sid, trixie | 6.12-1 | fixed |
| squid3 (PTS) | jessie, jessie (lts) | 3.5.23-5+deb8u7 | vulnerable |
| stretch (security) | 3.5.23-5+deb9u7 | vulnerable |
| stretch (lts), stretch | 3.5.23-5+deb9u10 | vulnerable |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| squid | source | (unstable) | 6.1-1 | | | |
| squid3 | source | (unstable) | (unfixed) | | | |
Notes
[bookworm] - squid <ignored> (Vulnerable feature got removed upstream, workaround exists)
[bullseye] - squid <ignored> (Vulnerable feature got removed upstream, workaround exists)
https://github.com/squid-cache/squid/security/advisories/GHSA-rj5h-46j6-q2g5
https://megamansec.github.io/Squid-Security-Audit/trace-uaf.html
https://github.com/squid-cache/squid/pull/1127 possibly removed the vulnerable code.
[buster] - squid <ignored> (Vulnerable feature got removed upstream, workaround exists)
[stretch] - squid3 <ignored> (Vulnerable feature got removed upstream, workaround exists)
[jessie] - squid3 <ignored> (Vulnerable feature got removed upstream, workaround exists)