Squid Proxy up to 2.5.STABLE8 FQDN Lookup DNS Reply denial of service

CVSS Meta Temp Score
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CTI Interest Score
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7.2$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as problematic, was found in Squid Proxy up to 2.5.STABLE8. Affected is an unknown function of the component FQDN Lookup Handler. Such manipulation as part of DNS Reply leads to denial of service. This vulnerability is referenced as CVE-2005-0446. It is possible to launch the attack remotely. No exploit is available. It is advisable to implement a patch to correct this issue.

Detailsinfo

A vulnerability was found in Squid Proxy up to 2.5.STABLE8 (Firewall Software) and classified as critical. Affected by this issue is some unknown functionality of the component FQDN Lookup Handler. The manipulation as part of a DNS Reply leads to a denial of service vulnerability. Using CWE to declare the problem leads to CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. Impacted is availability. CVE summarizes:

Squid 2.5.STABLE8 and earlier allows remote attackers to cause a denial of service (crash) via certain DNS responses regarding (1) Fully Qualified Domain Names (FQDN) in fqdncache.c or (2) IP addresses in ipcache.c, which trigger an assertion failure.

The bug was discovered 02/14/2005. The weakness was published 02/11/2005 with Squid Team (Website). The advisory is shared for download at squid-cache.org. This vulnerability is handled as CVE-2005-0446 since 02/16/2005. The attack may be launched remotely. No form of authentication is required for exploitation. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1499.

The vulnerability scanner Nessus provides a plugin with the ID 19615 (Fedora Core 3 : squid-2.5.STABLE8-1.FC3.1 (2005-154)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Fedora Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 115086 (Squid Proxy DNS Denial Of Service Vulnerability).

Applying a patch is able to eliminate this problem. The bugfix is ready for download at squid-cache.org. A possible mitigation has been published 2 weeks after the disclosure of the vulnerability. Furthermore it is possible to detect and prevent this kind of attack with TippingPoint and the filter 11671.

The vulnerability is also documented in the databases at X-Force (19332), Tenable (19615), SecurityFocus (BID 12551†), OSVDB (13776†) and Secunia (SA14271†). Once again VulDB remains the best source for vulnerability data.

Productinfo

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Version

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.5
VulDB Meta Temp Score: 7.2

VulDB Base Score: 7.5
VulDB Temp Score: 7.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Denial of service
CWE: CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 19615
Nessus Name: Fedora Core 3 : squid-2.5.STABLE8-1.FC3.1 (2005-154)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍
Nessus Port: 🔍

OpenVAS ID: 53518
OpenVAS Name: Debian Security Advisory DSA 688-1 (squid)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Patch: squid-cache.org
TippingPoint: 🔍

McAfee IPS: 🔍
McAfee IPS Version: 🔍

ISS Proventia IPS: 🔍
PaloAlto IPS: 🔍

Timelineinfo

02/11/2005 🔍
02/14/2005 +3 days 🔍
02/14/2005 +0 days 🔍
02/14/2005 +0 days 🔍
02/14/2005 +0 days 🔍
02/14/2005 +0 days 🔍
02/16/2005 +1 days 🔍
02/16/2005 +0 days 🔍
02/20/2005 +4 days 🔍
02/23/2005 +3 days 🔍
05/02/2005 +68 days 🔍
09/12/2005 +133 days 🔍
07/05/2025 +7236 days 🔍

Sourcesinfo

Vendor: squid-cache.org

Advisory: squid-cache.org
Researcher: http://www.squid-cache.org
Organization: Squid Team
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2005-0446 (🔍)
GCVE (CVE): GCVE-0-2005-0446
GCVE (VulDB): GCVE-100-1220

OVAL: 🔍

X-Force: 19332 - Squid Web Proxy Cache xstrndup function denial of service, Medium Risk
SecurityFocus: 12551 - Squid Proxy DNS Name Resolver Remote Denial Of Service Vulnerability
Secunia: 14271 - Squid FQDN Lookup Denial of Service Vulnerability, Less Critical
OSVDB: 13776 - Squid Malformed FQDN Lookup DoS
Vulnerability Center: 7115 - DoS in Squid Web Proxy Cache 2.5 .STABLE5 - 2.5 .STABLE8 via DNS Responses, High

Entryinfo

Created: 02/16/2005 12:45
Updated: 07/05/2025 13:55
Changes: 02/16/2005 12:45 (101), 07/01/2019 12:47 (2), 07/05/2025 13:55 (19)
Complete: 🔍
Cache ID: 216::103

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