Squid Proxy up to 3.1.15 DNS Reply resource management

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

Summaryinfo

A vulnerability marked as problematic has been reported in Squid Proxy up to 3.1.15. This affects an unknown part of the component DNS Reply Handler. This manipulation causes resource management. This vulnerability is registered as CVE-2011-4096. No exploit is available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Squid Proxy up to 3.1.15 (Firewall Software). It has been declared as critical. Affected by this vulnerability is an unknown code of the component DNS Reply Handler. The manipulation with an unknown input leads to a resource management vulnerability. The CWE definition for the vulnerability is CWE-399. As an impact it is known to affect availability. The summary by CVE is:

The idnsGrokReply function in Squid before 3.1.16 does not properly free memory, which allows remote attackers to cause a denial of service (daemon abort) via a DNS reply containing a CNAME record that references another CNAME record that contains an empty A record.

The weakness was published 11/01/2011 by M.A. Young (Website). It is possible to read the advisory at bugs.squid-cache.org. This vulnerability is known as CVE-2011-4096 since 10/18/2011. The attack can be launched remotely. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 68401 (Oracle Linux 6 : squid (ELSA-2011-1791)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Oracle Linux Local Security Checks. The commercial vulnerability scanner Qualys is able to test this issue with plugin 169027 (SUSE Enterprise Linux Security Update for squid3 (SUSE-SU-2016:1996-1)).

Upgrading eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at bugs.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.

The vulnerability is also documented in the databases at X-Force (71067), Tenable (68401), SecurityFocus (BID 50449†), Secunia (SA46609†) and SecurityTracker (ID 1026265†). Similar entries are available at VDB-7183, VDB-9526, VDB-67519 and VDB-67520. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

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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

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

NVD Base Score: 🔍

Exploitinginfo

Class: Resource management
CWE: CWE-399 / 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: 68401
Nessus Name: Oracle Linux 6 : squid (ELSA-2011-1791)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Port: 🔍

OpenVAS ID: 70700
OpenVAS Name: Debian Security Advisory DSA 2381-1 (squid3)
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: bugs.squid-cache.org
McAfee IPS: 🔍
McAfee IPS Version: 🔍

Fortigate IPS: 🔍

Timelineinfo

10/18/2011 🔍
10/31/2011 +12 days 🔍
11/01/2011 +1 days 🔍
11/17/2011 +16 days 🔍
11/17/2011 +0 days 🔍
11/21/2011 +4 days 🔍
11/21/2011 +0 days 🔍
01/06/2012 +46 days 🔍
07/12/2013 +553 days 🔍
08/07/2024 +4044 days 🔍

Sourcesinfo

Vendor: squid-cache.org

Advisory: bugs.squid-cache.org
Researcher: M.A. Young
Status: Not defined
Confirmation: 🔍

CVE: CVE-2011-4096 (🔍)
GCVE (CVE): GCVE-0-2011-4096
GCVE (VulDB): GCVE-100-4435

OVAL: 🔍

X-Force: 71067
SecurityFocus: 50449
Secunia: 46609 - Squid DNS Replies Invalid Free Denial of Service Vulnerability, Moderately Critical
SecurityTracker: 1026265
Vulnerability Center: 33892 - Squid before 3.1.16 idnsGrokReply Function Remote DoS Vulnerability via Crafted DNS Reply, High

See also: 🔍

Entryinfo

Created: 11/21/2011 01:00
Updated: 08/07/2024 10:49
Changes: 11/21/2011 01:00 (81), 04/05/2017 14:52 (7), 03/19/2021 17:11 (3), 03/19/2021 17:15 (2), 03/19/2021 17:20 (1), 08/07/2024 10:49 (16)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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