Description
The Squid Software Foundation Squid HTTP Caching Proxy version prior to version 4.0.23 contains a NULL Pointer Dereference vulnerability in HTTP Response X-Forwarded-For header processing that can result in Denial of Service to all clients of the proxy. This attack appear to be exploitable via Remote HTTP server responding with an X-Forwarded-For header to certain types of HTTP request. This vulnerability appears to have been fixed in 4.0.23 and later.
References (9)
Core 9
Core References
Vendor Advisory vendor-advisory
x_refsource_ubuntu
https://usn.ubuntu.com/4059-2/
Third Party Advisory vendor-advisory
x_refsource_ubuntu
https://usn.ubuntu.com/3557-1/
Patch, Vendor Advisory x_refsource_confirm
http://www.squid-cache.org/Versions/v4/changesets/SQUID-2018_2.patch
Third Party Advisory vendor-advisory
x_refsource_debian
https://www.debian.org/security/2018/dsa-4122
Patch, Vendor Advisory x_refsource_confirm
http://www.squid-cache.org/Advisories/SQUID-2018_2.txt
Mailing List, Third Party Advisory mailing-list
x_refsource_mlist
https://lists.debian.org/debian-lts-announce/2018/02/msg00001.html
Third Party Advisory x_refsource_confirm
https://github.com/squid-cache/squid/pull/129/files
Patch, Vendor Advisory x_refsource_confirm
http://www.squid-cache.org/Versions/v3/3.5/changesets/SQUID-2018_2.patch
Mailing List, Third Party Advisory mailing-list
x_refsource_mlist
https://lists.debian.org/debian-lts-announce/2018/02/msg00002.html
Scores
CVSS v3
7.5
EPSS
0.1315
EPSS Percentile
95.9%
Attack Vector
NETWORK
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Details
CWE
CWE-476
Status
published
Products (7)
canonical/ubuntu_linux
14.04
canonical/ubuntu_linux
16.04
canonical/ubuntu_linux
17.10
debian/debian_linux
7.0
debian/debian_linux
8.0
debian/debian_linux
9.0
squid-cache/squid
< 4.0.23
Published
Feb 09, 2018
Tracked Since
Feb 18, 2026