squid: Denial of Service in SSL-Bump (CVE-2014-0128)
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
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
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.
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
If your install and build Squid from the original Squid sources
then the email@example.com 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
firstname.lastname@example.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.
2014-02-21 16:04 GMT Initial Report
2014-02-22 23:51 GMT Patch Provided
2014-03-09 00:14 GMT Packages Released
(from redmine: issue id 2871, created on 2014-04-28, closed on 2014-05-21)