Squid Proxy up to 3.5.14/4.0.6 HTTP Header input validation

CVSS Meta Temp Score
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CTI Interest Score
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7.3$0-$5k0.00

Summaryinfo

A vulnerability was found in Squid Proxy up to 3.5.14/4.0.6. It has been declared as problematic. Impacted is an unknown function of the component HTTP Header Handler. The manipulation results in input validation. This vulnerability was named CVE-2016-2569. The attack may be performed from remote. There is no available exploit. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical has been found in Squid Proxy up to 3.5.14/4.0.6 (Firewall Software). Affected is some unknown processing of the component HTTP Header Handler. The manipulation with an unknown input leads to a input validation vulnerability. CWE is classifying the issue as 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. This is going to have an impact on availability. CVE summarizes:

Squid 3.x before 3.5.15 and 4.x before 4.0.7 does not properly append data to String objects, which allows remote servers to cause a denial of service (assertion failure and daemon exit) via a long string, as demonstrated by a crafted HTTP Vary header.

The weakness was presented 02/27/2016 by Alex with Open Systems AG (Website). The advisory is shared for download at squid-cache.org. This vulnerability is traded as CVE-2016-2569 since 02/26/2016. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are neither technical details nor an exploit publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 89045 (Debian DLA-445-2 : squid3 regression update), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Debian Local Security Checks and running in the context l. 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 to version 3.5.15 or 4.0.7 eliminates this vulnerability. A possible mitigation has been published 5 days after the disclosure of the vulnerability. Furthermore it is possible to detect and prevent this kind of attack with TippingPoint and the filter 24467.

The vulnerability is also documented in the databases at Tenable (89045), SecurityFocus (BID 83406†) and Vulnerability Center (SBV-57368†). See VDB-4435, VDB-7183, VDB-9526 and VDB-67519 for similar entries. Once again VulDB remains the best source 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: 7.3

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

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

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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: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 89045
Nessus Name: Debian DLA-445-2 : squid3 regression update
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 103320
OpenVAS Name: Squid Multiple Denial of Service Vulnerabilities March16 (Windows)
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: 🔍

Upgrade: Proxy 3.5.15/4.0.7
TippingPoint: 🔍

McAfee IPS: 🔍
McAfee IPS Version: 🔍

Fortigate IPS: 🔍

Timelineinfo

02/23/2016 🔍
02/23/2016 +0 days 🔍
02/26/2016 +3 days 🔍
02/27/2016 +1 days 🔍
02/27/2016 +0 days 🔍
02/28/2016 +1 days 🔍
03/01/2016 +2 days 🔍
03/03/2016 +2 days 🔍
03/17/2016 +14 days 🔍
07/08/2022 +2304 days 🔍

Sourcesinfo

Vendor: squid-cache.org

Advisory: RHSA-2016:2600
Researcher: Alex
Organization: Open Systems AG
Status: Not defined
Confirmation: 🔍

CVE: CVE-2016-2569 (🔍)
GCVE (CVE): GCVE-0-2016-2569
GCVE (VulDB): GCVE-100-81108
SecurityFocus: 83406 - Squid Multiple Denial of Service Vulnerabilities
SecurityTracker: 1035101
Vulnerability Center: 57368 - Squid Remote DoS due to Improper Appending Data to String Objects, Medium

See also: 🔍

Entryinfo

Created: 02/28/2016 21:36
Updated: 07/08/2022 15:39
Changes: 02/28/2016 21:36 (73), 02/01/2019 14:38 (19), 07/08/2022 15:39 (5)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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