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AUSCERT External Security Bulletin Redistribution
USN-4356-1: Squid vulnerabilities
14 May 2020
AusCERT Security Bulletin Summary
Operating System: Ubuntu
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Denial of Service -- Remote/Unauthenticated
Reduced Security -- Remote/Unauthenticated
CVE Names: CVE-2020-11945 CVE-2019-18860 CVE-2019-12521
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USN-4356-1: Squid vulnerabilities
13 May 2020
squid, squid3 vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:
o Ubuntu 20.04 LTS
o Ubuntu 19.10
o Ubuntu 18.04 LTS
o Ubuntu 16.04 LTS
Several security issues were fixed in Squid.
o squid - Web proxy cache server
o squid3 - Web proxy cache server
Jeriko One discovered that Squid incorrectly handled certain Edge Side Includes
(ESI) responses. A malicious remote server could cause Squid to crash, possibly
poison the cache, or possibly execute arbitrary code. (CVE-2019-12519,
It was discovered that Squid incorrectly handled the hostname parameter to
cachemgr.cgi when certain browsers are used. A remote attacker could possibly
use this issue to inject HTML or invalid characters in the hostname parameter.
This issue only affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 19.10.
ClA(C)ment Berthaux and Florian Guilbert discovered that Squid incorrectly
handled Digest Authentication nonce values. A remote attacker could use this
issue to replay nonce values, or possibly execute arbitrary code.
The problem can be corrected by updating your system to the following package
Ubuntu 20.04 LTS
squid - 4.10-1ubuntu1.1
squid - 4.8-1ubuntu2.3
Ubuntu 18.04 LTS
squid - 3.5.27-1ubuntu1.6
Ubuntu 16.04 LTS
squid - 3.5.12-1ubuntu7.11
To update your system, please follow these instructions: https://
In general, a standard system update will make all the necessary changes.
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