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AUSCERT External Security Bulletin Redistribution
ESB-2020.1371
Squid Proxy Cache Security Update Advisory SQUID-2019:4
20 April 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: Squid Proxy Cache
Publisher: Squid
Operating System: UNIX variants (UNIX, Linux, OSX)
Windows
Impact/Access: Cross-site Scripting -- Remote with User Interaction
Reduced Security -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2019-12524 CVE-2019-12520
Original Bulletin:
http://www.squid-cache.org/Advisories/SQUID-2019_4.txt
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Squid Proxy Cache Security Update Advisory SQUID-2019:4
Advisory ID: SQUID-2019:4
Date: April 18, 2020
Summary: Multiple Issues
in HTTP Request processing.
Affected versions: Squid 3.5.18 -> 3.5.28
Squid 4.0.10 -> 4.7
Fixed in version: Squid 4.8
http://www.squid-cache.org/Advisories/SQUID-2019_4.txt
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12520
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12524
Problem Description:
Due to incorrect URL handling Squid is vulnerable to access
control bypass, cache poisoning and cross-site scripting attacks
when processing HTTP Request messages.
Severity:
A remote client can deliver crafted URLs to bypass cache manager
security controls and retrieve confidential details about the
proxy and traffic it is handling.
A remote client can deliver crafted URLs which cause arbitrary
content from one origin server to be stored in cache as URLs
within another origin. This opens a window of opportunity for
clients to be tricked into fetching and XSS execution of that
content via side channels.
Updated Packages:
This bug is fixed by Squid version 4.8.
In addition, patches addressing this problem for the stable
releases can be found in our patch archives:
Squid 4:
<http://www.squid-cache.org/Versions/v4/changesets/SQUID-2019_4.patch>
If you are using a prepackaged version of Squid then please refer
to the package vendor for availability information on updated
packages.
Determining if your version is vulnerable:
All Squid-2.x are not vulnerable.
All Squid-3.x up to and including 3.5.17 are not vulnerable.
All Squid-3.5.18 up to and including 3.5.28 are vulnerable.
All Squid-4.x up to and including 4.0.9 are not vulnerable.
All Squid-4.x up to and including 4.7 without HTTPS support are
not vulnerable.
All Squid-4.0.10 up to and including 4.7 with HTTPS support are
vulnerable.
Workarounds:
There are no workarounds for Squid-3.5.
For Squid-4 build using --without-openssl --without-gnutls
Contact details for the Squid project:
For installation / upgrade support on binary packaged versions
of Squid: Your first point of contact should be your binary
package vendor.
If your install and build Squid from the original Squid sources
then the squid-users@lists.squid-cache.org mailing list is your
primary support point. For subscription details see
<http://www.squid-cache.org/Support/mailing-lists.html>.
For reporting of non-security bugs in the latest STABLE release
the squid bugzilla database should be used
<http://bugs.squid-cache.org/>.
For reporting of security sensitive bugs send an email to the
squid-bugs@lists.squid-cache.org mailing list. It's a closed
list (though anyone can post) and security related bug reports
are treated in confidence until the impact has been established.
Credits:
This vulnerability was discovered by Jeriko One
<jeriko.one@gmx.us>.
Fixed by Amos Jeffries of Treehouse Networks Ltd.
Revision history:
2019-05-14 14:56:49 UTC Initial Report
2019-06-23 15:15:56 UTC Patches Released
2019-06-05 15:52:17 UTC CVE Assignment
END
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