| Name | CVE-2023-46728 |
| Description | Squid is a caching proxy for the Web supporting HTTP, HTTPS, FTP, and more. Due to a NULL pointer dereference bug Squid is vulnerable to a Denial of Service attack against Squid's Gopher gateway. The gopher protocol is always available and enabled in Squid prior to Squid 6.0.1. Responses triggering this bug are possible to be received from any gopher server, even those without malicious intent. Gopher support has been removed in Squid version 6.0.1. Users are advised to upgrade. Users unable to upgrade should reject all gopher URL requests. |
| 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> (unsupported, Gopher support has been removed upstream)
[bullseye] - squid <ignored> (unsupported, Gopher support has been removed upstream)
[buster] - squid <ignored> (unsupported, Gopher support has been removed upstream)
No code fix, gopher support was removed:
https://github.com/squid-cache/squid/commit/6ea12e8fb590ac6959e9356a81aa3370576568c3 (SQUID_6_0_1)
https://github.com/squid-cache/squid/security/advisories/GHSA-cg5h-v6vc-w33f
https://megamansec.github.io/Squid-Security-Audit/gopher-nullpointer.html
[stretch] - squid3 <ignored> (unsupported, Gopher support has been removed upstream)
[jessie] - squid3 <ignored> (unsupported, Gopher support has been removed upstream)