Description
client_side.cc in Squid before 3.5.18 and 4.x before 4.0.10 does not properly ignore the Host header when absolute-URI is provided, which allows remote attackers to conduct cache-poisoning attacks via an HTTP request.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 8 | squid3 | 3.4.8-6+deb8u3 | DSA-3625-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | squid3 | 3.5.12-1ubuntu7.2 | USN-2995-1 |
| Ubuntu 14.04 LTS | squid3 | 3.3.8-1ubuntu6.8 | USN-2995-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | squid +1 | 7:3.3.8-26.el7_2.3 | RHSA-2016:1139 |
| RHEL 6 | squid34 | 7:3.4.14-9.el6_8.3 | RHSA-2016:1140 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP1 | squid | 3.3.14-20.2 | SUSE-SU-2016:2008-1 |
| SLES 11 SP4 | squid3 | 3.1.23-8.16.30.1 | SUSE-SU-2016:2089-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP1 | squid | 3.3.14-20.2 | SUSE-SU-2016:2008-1 |
| SLES for SAP 11 SP4 | squid3 | 3.1.23-8.16.30.1 | SUSE-SU-2016:2089-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | squid | 4.16-1.5 | openSUSE-SU-2024:11403-1 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | squid +1 | 7:3.3.8-26.el7_2.3 | ELSA-2016-1139 |
Advisories 8
- RHSA-2016:1140 Red Hat Security Advisory: squid34 security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2016:1139 Red Hat Security Advisory: squid security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- DSA-3625-1 squid3 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- USN-2995-1 squid3 vulnerabilities Ubuntu Security Notices (USN) · Feb 10, 2026
- SUSE-SU-2016:2008-1 Security update for squid SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:11403-1 squid-4.16-1.5 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2016:2089-1 Security update for squid3 SUSE / openSUSE Security Updates · Feb 4, 2026
- ELSA-2016-1139 Moderate: squid security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · May 31, 2016
References
- GLSA-201607-01 vendor-advisory
- http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html
- http://bugs.squid-cache.org/show_bug.cgi?id=4501
- SUSE-SU-2016:1996 vendor-advisory
- http://www.squid-cache.org/Advisories/SQUID-2016_7.txt
- USN-2995-1 vendor-advisory
- http://www.squid-cache.org/Versions/v3/3.5/changesets/squid-3.5-14039.patch
- RHSA-2016:1140 vendor-advisory
- openSUSE-SU-2016:2081 vendor-advisory
- RHSA-2016:1139 vendor-advisory
- SUSE-SU-2016:2089 vendor-advisory
- 1035768 vdb-entry
- DSA-3625 vendor-advisory