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.

Classification

CVE ID: CVE-2023-46728

CVSS Base Severity: HIGH

CVSS Base Score: 7.5

Affected Products

Vendor: squid-cache

Product: squid

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.53% (probability of being exploited)

EPSS Percentile: 77.15% (scored less or equal to compared to others)

EPSS Date: 2025-02-03 (when was this score calculated)

References

https://github.com/squid-cache/squid/security/advisories/GHSA-cg5h-v6vc-w33f
https://github.com/squid-cache/squid/commit/6ea12e8fb590ac6959e9356a81aa3370576568c3
https://security.netapp.com/advisory/ntap-20231214-0006/
https://lists.fedoraproject.org/archives/list/[email protected]/message/MEV66D3PAAY6K7TWDT3WZBLCPLASFJDC/
https://lists.fedoraproject.org/archives/list/[email protected]/message/A5QASTMCUSUEW3UOMKHZJB3FTONWSRXS/

Timeline