Squid Proxy up to 2.6.STABLE16/3.0 Update input validation

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
5.3$0-$5k0.00

Summaryinfo

A vulnerability was found in Squid Proxy up to 2.6.STABLE16/3.0. It has been rated as problematic. The affected element is an unknown function of the component Update Handler. This manipulation causes input validation. This vulnerability appears as CVE-2007-6239. There is no available exploit. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as problematic was found in Squid Proxy up to 2.6.STABLE16/3.0 (Firewall Software). Affected by this vulnerability is an unknown function of the component Update Handler. The manipulation with an unknown input leads to a input validation vulnerability. The CWE definition for the vulnerability is CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. As an impact it is known to affect availability. The summary by CVE is:

The "cache update reply processing" functionality in Squid 2.x before 2.6.STABLE17 and Squid 3.0 allows remote attackers to cause a denial of service (crash) via unknown vectors related to HTTP headers and an Array memory leak during requests for cached objects.

The bug was discovered 11/27/2007. The weakness was presented 12/04/2007 with Squid (Website). The advisory is shared at squid-cache.org. This vulnerability is known as CVE-2007-6239 since 12/04/2007. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Neither technical details nor an exploit are publicly available.

It is declared as proof-of-concept. The vulnerability was handled as a non-public zero-day exploit for at least 7 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 67623 (Oracle Linux 3 / 4 / 5 : squid (ELSA-2007-1130)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Oracle Linux Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 155186 (Oracle Enterprise Linux squid Security Update (ELSA-2007-1130)).

Upgrading eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at squid-cache.org. The best possible mitigation is suggested to be upgrading to the latest version. A possible mitigation has been published 3 months after the disclosure of the vulnerability. Furthermore it is possible to detect and prevent this kind of attack with TippingPoint and the filter 13928.

The vulnerability is also documented in the databases at X-Force (38837), Tenable (67623), SecurityFocus (BID 26687†), OSVDB (39381†) and Secunia (SA34467†). See VDB-41797 for similar entry. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.9
VulDB Meta Temp Score: 5.3

VulDB Base Score: 5.9
VulDB Temp Score: 5.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock

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

NVD Base Score: 🔍

Exploitinginfo

Class: Input validation
CWE: CWE-20
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Proof-of-Concept

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Nessus ID: 67623
Nessus Name: Oracle Linux 3 / 4 / 5 : squid (ELSA-2007-1130)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍
Nessus Port: 🔍

OpenVAS ID: 60358
OpenVAS Name: Debian Security Advisory DSA 1482-1 (squid)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

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

Patch: squid-cache.org
TippingPoint: 🔍
ISS Proventia IPS: 🔍
PaloAlto IPS: 🔍
Fortigate IPS: 🔍

Timelineinfo

11/27/2007 🔍
11/27/2007 +0 days 🔍
11/27/2007 +0 days 🔍
12/04/2007 +7 days 🔍
12/04/2007 +0 days 🔍
12/04/2007 +0 days 🔍
12/04/2007 +0 days 🔍
12/04/2007 +0 days 🔍
12/10/2007 +5 days 🔍
12/18/2007 +8 days 🔍
02/05/2008 +49 days 🔍
03/25/2009 +414 days 🔍
07/12/2013 +1570 days 🔍
06/02/2025 +4343 days 🔍

Sourcesinfo

Vendor: squid-cache.org

Advisory: squid-cache.org
Organization: Squid
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2007-6239 (🔍)
GCVE (CVE): GCVE-0-2007-6239
GCVE (VulDB): GCVE-100-3493

OVAL: 🔍

CERT: 🔍
X-Force: 38837
SecurityFocus: 26687 - Squid Proxy Cache Update Reply Processing Remote Denial of Service Vulnerability
Secunia: 34467 - Gentoo update for Squid, Moderately Critical
OSVDB: 39381 - Squid Cache Update Reply Processing Remote DoS
SecurityTracker: 1019036
Vulnerability Center: 17048 - National Science Foundation Squid Vulnerability Allows Remote Attacker to Cause DoS, High
Vupen: ADV-2007-4066

See also: 🔍

Entryinfo

Created: 12/18/2007 17:25
Updated: 06/02/2025 02:24
Changes: 12/18/2007 17:25 (103), 08/01/2019 11:27 (1), 12/09/2024 05:50 (17), 06/02/2025 02:24 (4)
Complete: 🔍
Cache ID: 216:85C:103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Interested in the pricing of exploits?

See the underground prices here!