[squid-users] [ADVISORY] SQUID-2014:4 Multiple issues in pinger ICMP processing.

[Amos Jeffries]

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      Squid Proxy Cache Security Update Advisory SQUID-2014:4
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Advisory ID:            SQUID-2014:4
Date:                   September 15, 2014
Summary:                Multiple issues in pinger ICMP 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_4.txt
    http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-7141
    http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-7142
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Problem Description:

 Due to incorrect bounds checking Squid pinger binary is
 vulnerable to denial of service or information leak attack when
 processing larger than normal ICMP or ICMPv6 packets.

 Due to incorrect input validation Squid pinger binary is
 vulnerable to denial of service or information leak attacks when
 processing ICMP or ICMPv6 packets.

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Severity:

 Several bugs allow any remote server to perform a denial of
 service attack on the Squid service by crashing the pinger.

 Some of these bugs allow attackers to leak arbitrary amounts of
 information from the heap into Squid log files. This is of higher
 importance than usual because the pinger process operates with
 root priviliges.

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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 3.1:
http://www.squid-cache.org/Versions/v3/3.1/changesets/squid-3.1-10490.patch

Squid 3.2:
http://www.squid-cache.org/Versions/v3/3.2/changesets/squid-3.2-11830.patch

Squid 3.3:
http://www.squid-cache.org/Versions/v3/3.3/changesets/squid-3.3-12683.patch

Squid 3.4:
http://www.squid-cache.org/Versions/v3/3.4/changesets/squid-3.4-13173.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-icmp are not vulnerable to these
 problems.

 Check the server running processes list to determine if the Squid
 service is running a "pinger" child process.

 All unpatched Squid-2.x and Squid-3.x versions up to and
 including 3.4.7 running the pinger process are vulnerable to
 these problems.

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Workaround:

 Configuring the firewall controlling access to Squid service such
 that only ICMP ECHO packets are allowed delivery to the Squid
 pinger process will limit the denial of service vulnerability.

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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 at 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 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 at 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:

 Several of the vulnerabilities were discovered and fixed by
 Sebastian Krahmer of the OpenSUSE Project.

 Some of the vulnerabilities were discovered and fixed by Amos
 Jeffries of Treehouse Networks Ltd.

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Revision history:

 2014-09-09 08:39 GMT Initial Report
 2014-09-15 08:15 GMT Patches and Packages Released
 2014-09-22 06:08 GMT CVE assignment
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