Squid 3.x < 3.5.17 / 4.x < 4.0.9 Esi.cc Multiple Vulnerabilities

Medium Nessus Plugin ID 91193

Synopsis

The remote proxy server is affected by multiple vulnerabilities.

Description

According to its banner, the version of Squid running on the remote host is 3.x prior to 3.5.17 or 4.x prior to 4.0.9. It is, therefore, affected by multiple vulnerabilities :

- An assertion fault exists in file esi/Esi.cc that is triggered when handling ESI responses. An unauthenticated, remote attacker can exploit this, via an HTTP server that uses specially crafted Edge Side Includes (ESI), to cause a denial of service condition or the execution of arbitrary code. (CVE-2016-4052)

- A flaw exists in file esi/Esi.cc due to improper validation of user-supplied input when handling ESI responses. An unauthenticated, remote attacker can exploit this, via specially crafted ESI responses, to disclose sensitive stack layout information.
(CVE-2016-4053)

- A buffer overflow condition exists in file esi/Esi.cc due to improper validation of user-supplied input when handling ESI responses. An unauthenticated, remote attacker can exploit this, via specially crafted ESI responses, to cause a denial of service condition or the execution of arbitrary code. (CVE-2016-4054)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.
Furthermore, the patch released to address these issues does not update the version given in the banner. If the patch has been applied properly, and the service has been restarted, then consider this to be a false positive.

Solution

Upgrade to Squid version 3.5.17 / 4.0.9 or later. Alternatively, apply the vendor-supplied patch.

See Also

http://www.squid-cache.org/Advisories/

http://www.squid-cache.org/Advisories/SQUID-2016_6.txt

Plugin Details

Severity: Medium

ID: 91193

File Name: squid_4_0_9_Esi_cc.nasl

Version: 1.3

Type: remote

Family: Firewalls

Published: 2016/05/17

Modified: 2018/07/30

Dependencies: 49692

Risk Information

Risk Factor: Medium

CVSS v2.0

Base Score: 6.8

Temporal Score: 5

Vector: CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P

Temporal Vector: CVSS2#E:U/RL:OF/RC:C

Vulnerability Information

CPE: cpe:/a:squid-cache:squid

Required KB Items: www/squid, Settings/ParanoidReport

Exploit Available: false

Exploit Ease: No known exploits are available

Patch Publication Date: 2016/04/20

Vulnerability Publication Date: 2016/04/20

Reference Information

CVE: CVE-2016-4052, CVE-2016-4053, CVE-2016-4054