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AUSCERT External Security Bulletin Redistribution
ESB-2020.2654.2
USN-4446-1: Squid vulnerabilities
28 August 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: Squid
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Denial of Service -- Remote/Unauthenticated
Access Confidential Data -- Remote/Unauthenticated
Unauthorised Access -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2019-18676 CVE-2019-12524 CVE-2019-12523
CVE-2019-12520
Reference: ESB-2020.2363
ESB-2020.1736.2
Original Bulletin:
https://usn.ubuntu.com/4446-1/
https://usn.ubuntu.com/4446-2/
Comment: This bulletin contains two (2) Ubuntu security advisories.
Revision History: August 28 2020: USN-4446-2 published, advising of
a regression involving icap and ecap
protocols
August 4 2020: Initial Release
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USN-4446-1: Squid vulnerabilities
03 August 2020
Several security issues were fixed in Squid.
Releases
o Ubuntu 18.04 LTS
o Ubuntu 16.04 LTS
Packages
o squid3 - Web proxy cache server
Details
Jeriko One discovered that Squid incorrectly handled caching certain
requests. A remote attacker could possibly use this issue to perform
cache-injection attacks or gain access to reverse proxy features such as
ESI. (CVE-2019-12520)
Jeriko One and Kristoffer Danielsson discovered that Squid incorrectly
handled certain URN requests. A remote attacker could possibly use this
issue to bypass access checks. (CVE-2019-12523)
Jeriko One discovered that Squid incorrectly handled URL decoding. A remote
attacker could possibly use this issue to bypass certain rule checks.
(CVE-2019-12524)
Jeriko One and Kristoffer Danielsson discovered that Squid incorrectly
handled input validation. A remote attacker could use this issue to cause
Squid to crash, resulting in a denial of service. (CVE-2019-18676)
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 18.04
o squid - 3.5.27-1ubuntu1.7
Ubuntu 16.04
o squid - 3.5.12-1ubuntu7.12
In general, a standard system update will make all the necessary changes.
References
o CVE-2019-12520
o CVE-2019-12523
o CVE-2019-12524
o CVE-2019-18676
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USN-4446-2: Squid regression
27 August 2020
USN-4446-1 introduced a regression in Squid.
Releases
o Ubuntu 18.04 LTS
o Ubuntu 16.04 LTS
Packages
o squid3 - Web proxy cache server
Details
USN-4446-1 fixed vulnerabilities in Squid. The update introduced a
regression when using Squid with the icap or ecap protocols. This update
fixes the problem.
We apologize for the inconvenience.
Original advisory details:
Jeriko One discovered that Squid incorrectly handled caching certain
requests. A remote attacker could possibly use this issue to perform
cache-injection attacks or gain access to reverse proxy features such as
ESI. (CVE-2019-12520)
Jeriko One and Kristoffer Danielsson discovered that Squid incorrectly
handled certain URN requests. A remote attacker could possibly use this
issue to bypass access checks. (CVE-2019-12523)
Jeriko One discovered that Squid incorrectly handled URL decoding. A remote
attacker could possibly use this issue to bypass certain rule checks.
(CVE-2019-12524)
Jeriko One and Kristoffer Danielsson discovered that Squid incorrectly
handled input validation. A remote attacker could use this issue to cause
Squid to crash, resulting in a denial of service. (CVE-2019-18676)
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 18.04
o squid - 3.5.27-1ubuntu1.8
Ubuntu 16.04
o squid - 3.5.12-1ubuntu7.13
In general, a standard system update will make all the necessary changes.
References
o https://launchpad.net/bugs/1890265
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===========================================================================
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The University of Queensland
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The post ESB-2020.2654.2 - UPDATE [Ubuntu] Squid: Multiple vulnerabilities first appeared on Malware Devil.
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