CVE-2020-11945

Publication date 23 April 2020

Last updated 25 August 2025

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

9.8 · Critical

Score breakdown

Description

An issue was discovered in Squid before 5.0.2. A remote attacker can replay a sniffed Digest Authentication nonce to gain access to resources that are otherwise forbidden. This occurs because the attacker can overflow the nonce reference counter (a short integer). Remote code execution may occur if the pooled token credentials are freed (instead of replayed as valid credentials).

Status

Package Ubuntu Release Status
squid 21.04 hirsute
Fixed 4.10-1ubuntu2
20.10 groovy
Fixed 4.10-1ubuntu2
20.04 LTS focal
Fixed 4.10-1ubuntu1.1
19.10 eoan
Fixed 4.8-1ubuntu2.3
18.04 LTS bionic Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
squid3 21.04 hirsute Not in release
20.10 groovy Not in release
20.04 LTS focal Not in release
19.10 eoan Not in release
18.04 LTS bionic
Fixed 3.5.27-1ubuntu1.6
16.04 LTS xenial
Fixed 3.5.12-1ubuntu7.11
14.04 LTS trusty Not in release

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package Patch details
squid

Severity score breakdown

CVSS version: CVSS v3.0

Base score 9.8 · Critical

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

Related Ubuntu Security Notices (USN)

Other references

Access our resources on patching vulnerabilities