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   Squid Proxy Cache Security Update Advisory SQUID-2019:4
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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
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   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
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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.

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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.

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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.

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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.

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Workarounds:

There are no workarounds for Squid-3.5.

For Squid-4 build using --without-openssl --without-gnutls


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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.

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Credits:

This vulnerability was discovered by Jeriko One
<jeriko.one@gmx.us>.

Fixed by Amos Jeffries of Treehouse Networks Ltd.

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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
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END
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