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AUSCERT External Security Bulletin Redistribution
ESB-2018.1239
Squid Proxy Cache Security Update Advisory
20 April 2018
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AusCERT Security Bulletin Summary
---------------------------------
Product: Squid
Publisher: Squid
Operating System: UNIX variants (UNIX, Linux, OSX)
BSD variants
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2018-1172
Original Bulletin:
http://www.squid-cache.org/Advisories/SQUID-2018_3.txt
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__________________________________________________________________
Squid Proxy Cache Security Update Advisory SQUID-2018:3
__________________________________________________________________
Advisory ID: SQUID-2018:3
Date: April 18, 2018
Summary: Denial of Service issue
in ESI Response processing.
Affected versions: Squid 3.1.12.2 -> 3.1.23
Squid 3.2.0.8 -> 3.2.14
Squid 3.3 -> 4.0.12
Fixed in version: Squid 4.0.13
__________________________________________________________________
http://www.squid-cache.org/Advisories/SQUID-2018_3.txt
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-1172
__________________________________________________________________
Problem Description:
Due to incorrect pointer handling Squid is vulnerable to denial
of service attack when processing ESI responses.
__________________________________________________________________
Severity:
This problem allows a remote server delivering ESI responses
to trigger a denial of service for all clients accessing the
Squid service.
This problem is limited to Squid operating as reverse proxy.
__________________________________________________________________
Updated Packages:
This bug is fixed by Squid version 4.0.13.
In addition, patches addressing this problem for the stable
releases can be found in our patch archives:
Squid 3.5:
<http://www.squid-cache.org/Versions/v3/3.5/changesets/SQUID-2018_3.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 and older are not vulnerable.
All Squid-3.0 and older version are not vulnerable.
All Squid built with --disable-esi are not vulnerable.
All Squid-3.x versions up to and including 3.4.14 built with
--disable-ssl are not vulnerable.
All Squid-3.x versions up to and including 3.4.14 built without
--enable-ssl are not vulnerable.
All Squid-3.x versions up to and including 3.5.27 built without
--enable-esi are not vulnerable.
All Squid-3.1.12.2 and later versions up to and including
Squid-3.1.23 built with --enable-esi and--enable-ssl, and being
used for reverse-proxy are vulnerable.
All Squid-3.2.0.8 and later versions up to and including
Squid-3.2.14 built with --enable-esi and --enable-ssl, and being
used for reverse-proxy are vulnerable.
All Squid-3.3 and later versions up to and including
Squid-3.3.14 built with --enable-esi and --enable-ssl, and being
used for reverse-proxy are vulnerable.
All Squid-3.4 and later versions up to and including
Squid-3.4.14 built with --enable-esi and --enable-ssl, and being
used for reverse-proxy are vulnerable.
All Squid-3.5 versions up to and including 3.5.27 built without
--with-openssl are not vulnerable.
All Squid-3.5 and later versions up to and including 3.5.27 built
with --enable-esi and --with-openssl, and being used for
reverse-proxy are vulnerable.
All Squid-4 versions up to and including 4.0.12 built without
--with-openssl are not vulnerable.
All Squid-4 versions up to and including 4.0.12 built with
--with-openssl and being used for reverse-proxy are vulnerable.
__________________________________________________________________
Workarounds:
Either;
Build Squid with --disable-esi
Or,
Build Squid-3.1 to 3.4.14 or later with "--disable-ssl"
Or,
Build Squid-3.5 or later with "--without-openssl"
__________________________________________________________________
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 Michael Marshall of Trend
Micro working with Trend Micro's Zero Day Initiative.
Fixed by Christos Tsantilas on behalf of Measurement Factory.
__________________________________________________________________
Revision history:
2018-04-16 18:20:15 UTC Initial Report
2018-04-16 22:02:25 UTC Patches Released
2018-04-18 12:28:00 UTC Advisory Released
__________________________________________________________________
END
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The University of Queensland
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