CVE-2018-1172

Name	CVE-2018-1172
Description	This vulnerability allows remote attackers to deny service on vulnerable installations of The Squid Software Foundation Squid 3.5.27-20180318. Authentication is not required to exploit this vulnerability. The specific flaw exists within ClientRequestContext::sslBumpAccessCheck(). A crafted request can trigger the dereference of a null pointer. An attacker can leverage this vulnerability to create a denial-of-service condition to users of the system. Was ZDI-CAN-6088.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, 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	4.6-1+deb10u7	fixed
	buster (security)	4.6-1+deb10u8	fixed
	bullseye (security), bullseye	4.13-10+deb11u2	fixed
	bookworm, sid	5.7-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency
squid	source	experimental	4.0.21-1~exp5	unimportant
squid	source	wheezy	(not affected)
squid	source	(unstable)	4.1-1	unimportant
squid3	source	(unstable)	(unfixed)	unimportant

Notes

[wheezy] - squid <not-affected> (Vunerable code introduced in 3.1)
src:squid as source package reintroduced for 4.x in experimental
http://www.squid-cache.org/Advisories/SQUID-2018_3.txt
Squid 3.5 patch: http://www.squid-cache.org/Versions/v3/3.5/changesets/SQUID-2018_3.patch
Only affects custom builds with OpenSSL support enabled