CVE-2019-12520

NameCVE-2019-12520
DescriptionAn issue was discovered in Squid through 4.7 and 5. When receiving a request, Squid checks its cache to see if it can serve up a response. It does this by making a MD5 hash of the absolute URL of the request. If found, it servers the request. The absolute URL can include the decoded UserInfo (username and password) for certain protocols. This decoded info is prepended to the domain. This allows an attacker to provide a username that has special characters to delimit the domain, and treat the rest of the URL as a path or query string. An attacker could first make a request to their domain using an encoded username, then when a request for the target domain comes in that decodes to the exact URL, it will serve the attacker's HTML instead of the real HTML. On Squid servers that also act as reverse proxies, this allows an attacker to gain access to features that only reverse proxies can use, such as ESI.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
ReferencesDSA-4682-1
NVD severitymedium

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
squid (PTS)buster4.6-1+deb10u1vulnerable
buster (security)4.6-1+deb10u2fixed
bullseye4.11-2fixed
sid4.11-5fixed
squid3 (PTS)jessie3.4.8-6+deb8u5vulnerable
jessie (security)3.4.8-6+deb8u9vulnerable
stretch (security), stretch3.5.23-5+deb9u1vulnerable

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
squidsource(unstable)4.8-1
squidsourcebuster4.6-1+deb10u2DSA-4682-1
squid3source(unstable)(unfixed)

Notes

http://www.squid-cache.org/Advisories/SQUID-2019_4.txt
http://www.squid-cache.org/Versions/v4/changesets/SQUID-2019_4.patch

Search for package or bug name: Reporting problems