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AUSCERT External Security Bulletin Redistribution
ESB-2019.4560
USN-4213-1: Squid vulnerabilities
5 December 2019
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AusCERT Security Bulletin Summary
---------------------------------
Product: Squid
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Denial of Service -- Remote/Unauthenticated
Provide Misleading Information -- Remote/Unauthenticated
Unauthorised Access -- Remote/Unauthenticated
Reduced Security -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2019-18679 CVE-2019-18678 CVE-2019-18677
CVE-2019-18676 CVE-2019-12854 CVE-2019-12526
CVE-2019-12523
Reference: ESB-2019.4232
ESB-2019.2609
Original Bulletin:
https://usn.ubuntu.com/4213-1/
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USN-4213-1: Squid vulnerabilities
4 December 2019
squid, squid3 vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:
o Ubuntu 19.10
o Ubuntu 19.04
o Ubuntu 18.04 LTS
o Ubuntu 16.04 LTS
Summary
Several security issues were fixed in Squid.
Software Description
o squid - Web proxy cache server
o squid3 - Web proxy cache server
Details
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 and access restricted servers. This issue was only addressed in
Ubuntu 19.04 and Ubuntu 19.10. (CVE-2019-12523)
Jeriko One discovered that Squid incorrectly handed URN responses. A remote
attacker could use this issue to cause Squid to crash, resulting in a denial of
service, or possibly execute arbitrary code. (CVE-2019-12526)
Alex Rousskov discovered that Squid incorrectly handled certain strings. A
remote attacker could possibly use this issue to cause Squid to crash,
resulting in a denial of service. This issue only affected Ubuntu 19.04.
(CVE-2019-12854)
Jeriko One and Kristoffer Danielsson discovered that Squid incorrectly handled
certain input. A remote attacker could use this issue to cause Squid to crash,
resulting in a denial of service, or possibly execute arbitrary code. This
issue was only addressed in Ubuntu 19.04 and Ubuntu 19.10. (CVE-2019-18676)
Kristoffer Danielsson discovered that Squid incorrectly handled certain
messages. This issue could result in traffic being redirected to origins it
should not be delivered to. (CVE-2019-18677)
RA(C)gis Leroy discovered that Squid incorrectly handled certain HTTP request
headers. A remote attacker could use this to smuggle HTTP requests and corrupt
caches with arbitrary content. (CVE-2019-18678)
David Fifield discovered that Squid incorrectly handled HTTP Digest
Authentication. A remote attacker could possibly use this issue to obtain
pointer contents and bypass ASLR protections. (CVE-2019-18679)
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 19.10
squid - 4.8-1ubuntu2.1
Ubuntu 19.04
squid - 4.4-1ubuntu2.3
Ubuntu 18.04 LTS
squid3 - 3.5.27-1ubuntu1.4
Ubuntu 16.04 LTS
squid3 - 3.5.12-1ubuntu7.9
To update your system, please follow these instructions: https://
wiki.ubuntu.com/Security/Upgrades .
In general, a standard system update will make all the necessary changes.
References
o CVE-2019-12523
o CVE-2019-12526
o CVE-2019-12854
o CVE-2019-18676
o CVE-2019-18677
o CVE-2019-18678
o CVE-2019-18679
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