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AUSCERT External Security Bulletin Redistribution
ESB-2015.2461
Squid Proxy Cache Security Update Advisory SQUID-2015:3
22 September 2015
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AusCERT Security Bulletin Summary
---------------------------------
Product: Squid
Publisher: Squid
Operating System: Windows
UNIX variants (UNIX, Linux, OSX)
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
Original Bulletin:
http://www.squid-cache.org/Advisories/SQUID-2015_3.txt
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__________________________________________________________________
Squid Proxy Cache Security Update Advisory SQUID-2015:3
__________________________________________________________________
Advisory ID: SQUID-2015:3
Date: September 17, 2015
Summary: Multiple Remote Denial of service issues
in SSL/TLS processing.
Affected versions: Squid 3.5.0.1 -> 3.5.8
Fixed in version: Squid 3.5.9
__________________________________________________________________
http://www.squid-cache.org/Advisories/SQUID-2015_3.txt
__________________________________________________________________
Problem Description:
Due to integer overflow issues Squid is vulnerable to a denial
of service attack when processing SSL or TLS messages.
Due to lack of input validation Squid is vulnerable to a denial
of service attack when processing SSL or TLS messages.
__________________________________________________________________
Severity:
These problems allow any trusted client or external server to
perform a denial of service attack on the Squid service and all
other services on the same machine.
There exists popular software which triggers these bugs
unintentionally.
However, the bugs are exploitable only if you have configured a
Squid-3.5 listening port with ssl-bump.
__________________________________________________________________
Updated Packages:
These bugs are fixed by Squid version 3.5.9.
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-3.4 and older versions are not vulnerable.
All Squid-3.5 built without OpenSSL support are not vulnerable.
All unpatched Squid-3.5 with http_port or https_port configured
with the ssl-bump option in squid.conf are vulnerable.
The following command can be used to easily determine if a
vulnerable configuration is being used:
squid -k parse 2>&1 | grep ssl-bump
__________________________________________________________________
Workaround:
Remove ssl-bump configuration options from squid.conf
__________________________________________________________________
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@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@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:
The vulnerability was reported by Aleksandr Demchenko.
Fixes by Alex Rousskov and Christos Tsantilas of The Measurement
Factory.
__________________________________________________________________
Revision history:
2015-08-27 08:39:03 GMT Initial Report
2015-09-17 13:04:55 GMT Packages Released
__________________________________________________________________
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===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
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