Squid Web Proxy Cache 2.5 might allow remote attackers to obtain sensitive information via URLs containing invalid hostnames that cause DNS operations to fail, which results in references to previously used error messages.

An updated Squid package that fixes security issues is now available.

This update has been rated as having important security impact by the Red Hat Security Response Team.

Squid is a full-featured Web proxy cache.

A bug was found in the way Squid displays error messages. A remote attacker could submit a request containing an invalid hostname which would result in Squid displaying a previously used error message. The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CVE-2004-2479 to this issue.

Two denial of service bugs were found in the way Squid handles malformed requests. A remote attacker could submit a specially crafted request to Squid that would cause the server to crash. The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the names CVE-2005-2794 and CVE-2005-2796 to these issues.

Please note that CVE-2005-2796 does not affect Red Hat Enterprise Linux 2.1

Users of Squid should upgrade to this updated package that contains backported patches, and is not vulnerable to these issues.

The remote Redhat Enterprise Linux 4 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2005:766 advisory.

    Squid is a full-featured Web proxy cache.

    A bug was found in the way Squid displays error messages. A remote attacker     could submit a request containing an invalid hostname which would result in     Squid displaying a previously used error message. The Common     Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name     CAN-2004-2479 to this issue.

    Two denial of service bugs were found in the way Squid handles malformed     requests. A remote attacker could submit a specially crafted request to     Squid that would cause the server to crash. The Common Vulnerabilities and     Exposures project (cve.mitre.org) has assigned the names CAN-2005-2794 and     CAN-2005-2796 to these issues.

    Please note that CAN-2005-2796 does not affect Red Hat Enterprise Linux 2.1

    Users of Squid should upgrade to this updated package that contains     backported patches, and is not vulnerable to these issues.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

According to its banner, the version of Squid running on the remote host is prior to 2.5.STABLE8. It is, therefore, affected by an information disclosure vulnerability due to improper handling of malformed host names. An unauthenticated, remote attacker can exploit this issue to disclose the contents of recently freed memory as error messages.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote host running a Squid proxy on this port.
There is a vulnerability in the remote version of this software that may allow an attacker to obtain sensitive information via URLs containing invalid hostnames that cause DNS operations to fail, which results in references to previously used error messages.

The remote host running a Squid proxy on this port.
There is a vulnerability in the remote version of this software that may allow an attacker to disclose the content of its memory by causing the use of a freed pointer.

ID	Name	Product	Family	Severity
21855	CentOS 3 / 4 : squid (CESA-2005:766)	Nessus	CentOS Local Security Checks	medium
19713	RHEL 4 : squid (RHSA-2005:766)	Nessus	Red Hat Local Security Checks	high
15929	Squid < 2.5.STABLE8 Malformed Host Name Error Message Information Disclosure	Nessus	Firewalls	medium
2448	Squid 2.5.x < 2.5.STABLE8 Information Disclosure	Nessus Network Monitor	Web Servers	medium
801044	Squid Proxy Failed DNS Lookup Random Error Messages Information Disclosure	Log Correlation Engine	Web Servers	medium

Detections

Analytics

CVE-2004-2479

high

Tenable Plugins

medium

high

medium

medium

medium