Squid < 2.5.STABLE5 %xx URL Encoding ACL Bypass

High Nessus Network Monitor Plugin ID 1212

Synopsis

The remote proxy server is vulnerable to a flaw which allows for the bypassing of authentication

Description

The remote Squid caching proxy, according to its version number, is vulnerable to a flaw that may allow an attacker to gain access to unauthorized resources. The flaw in itself consists of sending a malformed username containing the %00 (null) character, that may allow an attacker to access otherwise restricted resources.

Solution

Upgrade to Squid 2.5.STABLE5 or later.

See Also

http://www.squid-cache.org/Advisories/SQUID-2004_1.txt

http://www.squid-cache.org/Versions/v2/2.5/bugs

Plugin Details

Severity: High

ID: 1212

Family: Web Servers

Published: 2004/08/20

Modified: 2016/11/23

Dependencies: 3389

Nessus ID: 12124

Risk Information

Risk Factor: High

CVSSv2

Base Score: 7.5

Temporal Score: 6.5

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

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

CVSSv3

Base Score: 7.3

Temporal Score: 7

Vector: CVSS3#AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Temporal Vector: CVSS3#E:H/RL:O/RC:C

Vulnerability Information

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

Patch Publication Date: 2004/03/15

Vulnerability Publication Date: 2004/03/15

Reference Information

CVE: CVE-2004-0189

BID: 9778