Description
An issue was discovered in Squid before 4.10. Due to incorrect input validation, the NTLM authentication credentials parser in ext_lm_group_acl may write to memory outside the credentials buffer. On systems with memory access protections, this can result in the helper process being terminated unexpectedly. This leads to the Squid process also terminating and a denial of service for all clients using the proxy.
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 14 | squid | 4.10-1 | — |
| Debian 13 | squid | 4.10-1 | — |
| Debian 12 | squid | 4.10-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | squid | 4.9-2ubuntu4 | — |
| Ubuntu 18.04 LTS | squid3 | 3.5.27-1ubuntu1.5 | USN-4289-1 |
| Ubuntu 16.04 LTS | squid3 | 3.5.12-1ubuntu7.10 | USN-4289-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP1 | squid | 4.10-5.14.1 | SUSE-SU-2020:1156-1, SUSE-SU-2020:0493-1 |
| SLES 15 | squid | 4.11-5.17.2 | SUSE-SU-2020:1156-1 |
| SLES 12 SP5 | squid | 4.10-4.6.1 | SUSE-SU-2020:1134-1, SUSE-SU-2020:0487-1 |
| SLES 12 SP4 | squid | 3.5.21-26.20.1 | SUSE-SU-2020:0661-1 |
| SLES 12 SP3 | squid | 3.5.21-26.20.1 | SUSE-SU-2020:0661-1 |
Show 14 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP2 | squid | 3.5.21-26.20.1 | SUSE-SU-2020:0661-1 |
| SLES 11 SP4 | squid3 | 3.1.23-8.16.37.12.1 | SUSE-SU-2020:14460-1 |
| SLES for SAP 15 | squid | 4.11-5.17.2 | SUSE-SU-2020:1156-1 |
| SLES for SAP 12 SP5 | squid | 4.10-4.6.1 | SUSE-SU-2020:1134-1, SUSE-SU-2020:0487-1 |
| SLES for SAP 12 SP4 | squid | 3.5.21-26.20.1 | SUSE-SU-2020:0661-1 |
| SLES for SAP 12 SP3 | squid | 3.5.21-26.20.1 | SUSE-SU-2020:0661-1 |
| SLES for SAP 12 SP2 | squid | 3.5.21-26.20.1 | SUSE-SU-2020:0661-1 |
| SLE HPC 15 | squid | 4.11-5.17.2 | SUSE-SU-2020:1156-1 |
| SUSE OpenStack Cloud Crowbar 8 | squid | 3.5.21-26.20.1 | SUSE-SU-2020:0661-1 |
| SUSE OpenStack Cloud 8 | squid | 3.5.21-26.20.1 | SUSE-SU-2020:0661-1 |
| SUSE OpenStack Cloud 7 | squid | 3.5.21-26.20.1 | SUSE-SU-2020:0661-1 |
| SUSE Linux Enterprise Point of Sale 11 SP3 | squid3 | 3.1.23-8.16.37.12.1 | SUSE-SU-2020:14460-1 |
| SUSE HPE Helion OpenStack 8 | squid | 3.5.21-26.20.1 | SUSE-SU-2020:0661-1 |
| SUSE Enterprise Storage 5 | squid | 3.5.21-26.20.1 | SUSE-SU-2020:0661-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | squid | 4.16-1.5 | openSUSE-SU-2024:11403-1 |
| openSUSE Leap 15.1 | squid | 4.10-lp151.2.11.1 | openSUSE-SU-2020:0623-1, openSUSE-SU-2020:0606-1, openSUSE-SU-2020:0307-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | squid | 4.10-r0 | — |
| Alpine v3.23 | squid | 4.10-r0 | — |
| Alpine v3.22 | squid | 4.10-r0 | — |
| Alpine v3.21 | squid | 4.10-r0 | — |
| Alpine v3.20 | squid | 4.10-r0 | — |
Show 12 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | squid | 4.10-r0 | — |
| Alpine v3.18 | squid | 4.10-r0 | — |
| Alpine v3.17 | squid | 4.10-r0 | — |
| Alpine v3.16 | squid | 4.10-r0 | — |
| Alpine v3.15 | squid | 4.10-r0 | — |
| Alpine v3.14 | squid | 4.10-r0 | — |
| Alpine v3.13 | squid | 4.10-r0 | — |
| Alpine v3.12 | squid | 4.10-r0 | — |
| Alpine v3.11 | squid | 4.10-r0 | — |
| Alpine v3.10 | squid | 4.10-r0 | — |
| Alpine v3.9 | squid | 4.10-r0 | — |
| Alpine v3.8 | squid | 3.5.27-r4 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | squid +2 | 7:3.5.20-17.amzn2.7.4 | ALAS2-2023-2062 |
Advisories 13
- USN-4289-1 squid, squid3 vulnerabilities Ubuntu Security Notices (USN) · Feb 10, 2026
- openSUSE-SU-2020:0307-1 Security update for squid SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:1134-1 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-2020:0661-1 Security update for squid SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:0623-1 Security update for squid SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:1156-1 Security update for squid SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:0493-1 Security update for squid SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:0606-1 Security update for squid SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:14460-1 Security update for squid3 SUSE / openSUSE Security Updates · May 2, 2025
- SUSE-SU-2020:0487-1 Security update for squid SUSE / openSUSE Security Updates · May 2, 2025
- WID-SEC-2023-1361 Squid: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jun 8, 2023
- ALAS2-2023-2062 Important: squid security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Jun 1, 2023
References
- http://www.squid-cache.org/Advisories/SQUID-2020_3.txt
- http://www.squid-cache.org/Versions/v4/changesets/squid-4-6982f1187a26557e582172965e266f544ea562a5.patch
- USN-4289-1 vendor-advisory
- openSUSE-SU-2020:0307 vendor-advisory
- GLSA-202003-34 vendor-advisory
- openSUSE-SU-2020:0606 vendor-advisory
- openSUSE-SU-2020:0623 vendor-advisory
- https://security.netapp.com/advisory/ntap-20210304-0002/