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Squid Proxy Cache Security Update Advisory SQUID-2014:3
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Advisory ID: SQUID-2014:3
Date: September 15, 2014
Summary: Buffer overflow in SNMP processing
Affected versions: Squid 3.x -> 3.4.7
Fixed in version: Squid 3.4.8
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http://www.squid-cache.org/Advisories/SQUID-2014_3.txt
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-6270
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Problem Description:
Due to incorrect buffer management Squid can be caused by an
attacker to write outside its allocated SNMP buffer.
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Severity:
The bug is important because it allows remote attackers to crash
Squid, causing a disruption in service. However, the bug is
exploitable only if you have configured Squid to receive SNMP
messages.
Sites that do not use SNMP are not vulnerable.
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Updated Packages:
This bug is fixed by Squid version 3.4.8
In addition, patches addressing this problem for stable releases
can be found in our patch archives:
Squid 3.0:
http://www.squid-cache.org/Versions/v3/3.0/changesets/squid-3.0-9202.patch
Squid 3.1:
http://www.squid-cache.org/Versions/v3/3.1/changesets/squid-3.1-10489.patch
Squid 3.2:
http://www.squid-cache.org/Versions/v3/3.2/changesets/squid-3.2-11829.patch
Squid 3.3:
http://www.squid-cache.org/Versions/v3/3.3/changesets/squid-3.3-12682.patch
Squid 3.4:
http://www.squid-cache.org/Versions/v3/3.4/changesets/squid-3.4-13172.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 built with --disable-snmp are not vulnerable to the
problem.
All Squid operating with "snmp_port 0" in squid.conf are not
vulnerable to the problem.
All Squid-3.x operating with snmp_port omitted from squid.conf
are not vulnerable to the problem.
All Squid-2.x operating with snmp_port omitted from squid.conf
are vulnerable to the problem.
All unpatched Squid versions up to and including 3.4.7 with
snmp_port configured to a non-0 value are vulnerable to the
problem.
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Workaround:
Either,
Configure the firewall controlling access to Squid service such
that only specific trusted sources can deliver SNMP packets to
the Squid SNMP listening port.
Or,
Disable SNMP. Which may be done in any of the following ways:
* Build Squid with ./configure --disable-snmp
* For Squid-2.x add the following directive to squid.conf file:
snmp_port 0
* For Squid-3.x remove from squid.conf (and include'd files) any of
the following directives which are present:
snmp_port
snmp_access
snmp_incoming_address
snmp_outgoing_address
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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 you install and build Squid from the original Squid sources
then the squid-users@xxxxxxxxxxxxxxx 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 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@xxxxxxxxxxxxxxx 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:
The vulnerability was discovered and fixed by Sebastian Krahmer
of the OpenSUSE Project.
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Revision history:
2014-09-09 12:01 GMT Initial Report
2014-09-10 06:12 GMT CVE Assignment
2014-09-15 08:15 GMT Patches and Packages Released
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