Detections
Analytics

Squid 3.x < 3.5.15 / 4.x < 4.0.7 Multiple DoS

high Nessus Plugin ID 89080

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Synopsis

The remote proxy server is potentially affected by multiple denial of service vulnerabilities.

Description

According to its banner, the version of Squid running on the remote host is 3.x prior to 3.5.15 or 4.x prior to 4.0.7. It is, therefore, potentially affected by multiple denial of service vulnerabilities :

 - A flaw exists due to not properly appending data to String objects. A remote attacker can exploit this, via a crafted HTTP Vary header, to cause an assertion failure and daemon exit, resulting in a denial of service. (CVE-2016-2569)

 - A flaw exists in the Edge Side Includes (ESI) parser due to a failure to check buffer limits during XML parsing.
 A remote attacker can exploit this, via a crafted XML document, to cause an assertion failure and daemon exit, resulting in a denial of service. (CVE-2016-2570)

 - A flaw exists in http.cc that allows the storage of certain data even after a response-parsing failure. A remote attacker can exploit this, via a malformed server response, to cause an assertion failure and daemon exit, resulting in a denial of service.
 CVE-2016-2571)

 - A flaw exists in http.cc due to reliance on the HTTP status code even after a response-parsing failure. A remote attacker can exploit this, via a malformed server response, to cause an assertion failure and daemon exit, resulting in a denial of service.
 (CVE-2016-2572)

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 3.5.15 / 4.0.7 or later. Alternatively, apply the vendor-supplied patch.

See Also

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

http://www.squid-cache.org/Advisories/SQUID-2016_2.txt

Plugin Details

Severity: High

ID: 89080

File Name: squid_4_0_7.nasl

Version: 1.5

Type: remote

Family: Firewalls

Published: 3/2/2016

Updated: 11/20/2019

Configuration: Enable paranoid mode

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

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

CVSS Score Source: CVE-2016-2572

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

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

Required KB Items: Settings/ParanoidReport, www/squid

Exploit Ease: No known exploits are available

Patch Publication Date: 2/23/2016

Vulnerability Publication Date: 2/23/2016

Reference Information

CVE: CVE-2016-2569, CVE-2016-2570, CVE-2016-2571, CVE-2016-2572