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             AUSCERT External Security Bulletin Redistribution

          Squid Proxy Cache Security Update Advisory SQUID-2014:1
                               12 March 2014


        AusCERT Security Bulletin Summary

Product:           Squid
Publisher:         Squid
Operating System:  UNIX variants (UNIX, Linux, OSX)
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2014-0128  

Original Bulletin: 

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    Squid Proxy Cache Security Update Advisory SQUID-2014:1

Advisory ID:            SQUID-2014:1
Date:                   March 09, 2014
Summary:                Denial of Service in SSL-Bump
Affected versions:      Squid 3.1 -> 3.3.11,
                        Squid 3.4 -> 3.4.3
Fixed in version:       Squid 3.3.12, 3.4.4


Problem Description:

 Due to incorrect state management Squid is vulnerable to a denial
 of service attack when processing certain HTTPS requests.



 This problem allows any client who can generate HTTPS requests
 to perform a denial of service attack on the Squid service.

 There are popular client software implementations which generate
 HTTPS requests and triggering this vulnerability during their
 normal activities.


Updated Packages:

 This bug is fixed by Squid versions 3.3.12 and 3.4.4.

 In addition, patches addressing this problem can be found in
 our patch archives.

Squid 3.3:

Squid 3.4:

 If you are using a prepackaged version of Squid then please refer
 to the package vendor for availability information on updated


Determining if your version is vulnerable:

 All Squid versions without SSL-Bump feature configured are not

 All Squid-3.0 and older versions, including Squid-2 are not

 All unpatched Squid-3.1 versions are vulnerable.

 All unpatched Squid-3.2 versions are vulnerable.

 All unpatched Squid-3.3 versions up to and including 3.3.11 are

 All unpatched Squid-3.4 versions up to and including 3.4.3 are




 Disable SSL-bump for clients affected by adding "ssl_bump none"
 rule(s) at the top of the ssl_bump configuration directives.


 Disable SSL-bump featrue completely by removing ssl-bump option
 from all http_port and/or https_port configuration directives.


 Use TCP_RESET instead of all Squid-generated error pages.
 Note that this is only a partial workaround as some error pages
 cannot be overridden.


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

 For reporting of non-security bugs in the latest STABLE release
 the squid bugzilla database should be used

 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.



 The vulnerability was reported by Mathias Fischer and Fabian
 Hugelshofer from Open Systems AG.

 Fixes by Alex Rousskov from The Measurement Factory.


Revision history:

 2014-02-21 16:04 GMT Initial Report
 2014-02-22 23:51 GMT Patch Provided
 2014-03-09 00:14 GMT Packages Released

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