Description
Incorrect processing of responses to If-None-Modified HTTP conditional requests in Squid HTTP Proxy 3.1.10 through 3.1.23, 3.2.0.3 through 3.5.22, and 4.0.1 through 4.0.16 leads to client-specific Cookie data being leaked to other clients. Attack requests can easily be crafted by a client to probe a cache for this information.
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+deb8u4 | DSA-3745-1 |
| Debian 7 | squid3 | 3.1.20-2.2+deb7u7 | DLA-763-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | squid3 | 3.5.12-1ubuntu7.3 | USN-3192-1 |
| Ubuntu 14.04 LTS | squid3 | 3.3.8-1ubuntu6.9 | USN-3192-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | squid +2 | 7:3.5.20-2.el7_3.2 | RHSA-2017:0182 |
| RHEL 6 | squid34 | 7:3.4.14-9.el6_8.4 | RHSA-2017:0183 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP2 | squid | 3.5.21-25.1 | SUSE-SU-2017:0128-1 |
| SLES 12 SP1 | squid | 3.3.14-22.6.1 | SUSE-SU-2017:0116-1 |
| SLES 11 SP4 | squid3 | 3.1.23-8.16.36.1 | SUSE-SU-2017:0110-1 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP2 | squid | 3.5.21-25.1 | SUSE-SU-2017:0128-1 |
| SLES for SAP 12 SP1 | squid | 3.3.14-22.6.1 | SUSE-SU-2017:0116-1 |
| SLES for SAP 11 SP4 | squid3 | 3.1.23-8.16.36.1 | SUSE-SU-2017:0110-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | squid | 4.16-1.5 | openSUSE-SU-2024:11403-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.3 | squid | 3.5.23-r0 | — |
| Alpine v3.2 | squid | 3.5.23-r0 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | squid +2 | 7:3.5.20-2.el7_3.2 | ELSA-2017-0182 |
Advisories 11
- RHSA-2017:0183 Red Hat Security Advisory: squid34 security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2017:0182 Red Hat Security Advisory: squid security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- DLA-763-1 squid3 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-3745-1 squid3 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- USN-3192-1 squid3 vulnerabilities Ubuntu Security Notices (USN) · Feb 10, 2026
- SUSE-SU-2017:0110-1 Security update for squid3 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:0128-1 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-2017:0116-1 Security update for squid SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2023-1362 Squid: Mehrere Schwachstellen ermöglichen Offenlegung von Informationen BSI CERT-Bund (WID) · Jun 8, 2023
- ELSA-2017-0182 Moderate: squid security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Jan 24, 2017
References
- http://www.squid-cache.org/Advisories/SQUID-2016_11.txt
- 1037513 vdb-entry
- [oss-security] 20161217 Re: CVE Request - squid HTTP proxy multiple Information Disclosure issues mailing-list
- RHSA-2017:0183 vendor-advisory
- RHSA-2017:0182 vendor-advisory
- 94953 vdb-entry
- DSA-3745 vendor-advisory