CVE-2023-46728

Published: 6 November 2023

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.

Notes

Author	Note
rodrigo-zaiden	the fix is removing support for Gopher protocol.

Priority

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package	Release	Status
squid Launchpad, Ubuntu, Debian	bionic	Ignored (end of standard support)
	focal	Released (4.10-1ubuntu1.8)
	jammy	Released (5.7-0ubuntu0.22.04.2)
	lunar	Released (5.7-1ubuntu3.1)
	mantic	Not vulnerable (6.1-2ubuntu1)
	trusty	Ignored (end of standard support)
	upstream	Released (6.1-1)
	xenial	Ignored (end of standard support)
	Patches: upstream: https://github.com/squid-cache/squid/commit/6ea12e8fb590ac6959e9356a81aa3370576568c3
squid3 Launchpad, Ubuntu, Debian	bionic	Released (3.5.27-1ubuntu1.14+esm1) Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
	focal	Does not exist
	jammy	Does not exist
	lunar	Does not exist
	mantic	Does not exist
	trusty	Ignored (end of standard support)
	upstream	Needs triage
	xenial	Released (3.5.12-1ubuntu7.16+esm2) Available with Ubuntu Pro or Ubuntu Pro (Infra-only)

Severity score breakdown

Parameter	Value
Base score	7.5
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

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