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Vulnerability of Squid: denial of service via TLS

Synthesis of the vulnerability 

An attacker can trigger an error in TLS connections management between Squid and remote servers, in order to trigger a denial of service.
Impacted systems: Squid, SUSE Linux Enterprise Desktop, SLES.
Severity of this alert: 2/4.
Creation date: 16/02/2016.
Références of this alert: CERTFR-2016-AVI-067, CVE-2016-2390, SQUID-2016:1, SUSE-SU-2016:1996-1, SUSE-SU-2016:2089-1, VIGILANCE-VUL-18953.

Description of the vulnerability 

The Squid product may be built with OpenSSL to manage TLS connections.

One may configure Squid to use TLS between the proxy and the remote server even if TLS is not used between the client and the proxy. However, in case of connection errors, Squid may attempt to connect again with 2 parallels TCP connections. This case is not handled and will lead to proxy malfunction or proxy abort.

An attacker can therefore trigger an error in TLS connections management between Squid and remote servers, in order to trigger a denial of service.
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This computer weakness note impacts software or systems such as Squid, SUSE Linux Enterprise Desktop, SLES.

Our Vigil@nce team determined that the severity of this security bulletin is medium.

The trust level is of type confirmed by the editor, with an origin of internet server.

An attacker with a expert ability can exploit this weakness announce.

Solutions for this threat 

Squid: version 3.5.14.
The version 3.5.14 is fixed:
  http://www.squid-cache.org/Versions/v3/3.5/squid-3.5.14.tar.gz

SUSE LE 11 SP4: new squid3 packages.
New packages are available:
  SUSE LE 11 SP4: squid3 3.1.23-8.16.27.1
  SUSE LE 11 SP4: squid3 3.1.23-8.16.30.1
  SUSE LE 11 SP4: squid3 3.1.23-8.16.27.1
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