Squid Proxy up to 3.5.14/4.0.6 Edge Side Includes Parser esi/CustomParser.cc 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.
7.0$0-$5k0.00

Summaryinfo

A vulnerability was found in Squid Proxy up to 3.5.14/4.0.6. It has been rated as problematic. The affected element is an unknown function of the file esi/CustomParser.cc of the component Edge Side Includes Parser. This manipulation causes input validation. The identification of this vulnerability is CVE-2016-2570. It is possible to initiate the attack remotely. There is no exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as critical was found in Squid Proxy up to 3.5.14/4.0.6 (Firewall Software). Affected by this vulnerability is an unknown function of the file esi/CustomParser.cc of the component Edge Side Includes Parser. 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 Edge Side Includes (ESI) parser in Squid 3.x before 3.5.15 and 4.x before 4.0.7 does not check buffer limits during XML parsing, which allows remote HTTP servers to cause a denial of service (assertion failure and daemon exit) via a crafted XML document, related to esi/CustomParser.cc and esi/CustomParser.h.

The weakness was shared 02/27/2016 (oss-sec). The advisory is shared at openwall.com. This vulnerability is known as CVE-2016-2570 since 02/26/2016. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are known, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 88944 (FreeBSD : squid -- remote DoS in HTTP response processing (660ebbf5-daeb-11e5-b2bd-002590263bf5)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family FreeBSD 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 before and not just after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at X-Force (111078) and Tenable (88944). The entries VDB-4435, VDB-7183, VDB-9526 and VDB-67519 are related to this item. 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: 7.5
VulDB Meta Temp Score: 7.0

VulDB Base Score: 7.5
VulDB Temp Score: 6.5
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

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: Unproven

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Nessus ID: 88944
Nessus Name: FreeBSD : squid -- remote DoS in HTTP response processing (660ebbf5-daeb-11e5-b2bd-002590263bf5)
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: 🔍

0-Day Time: 🔍

Upgrade: Proxy 3.5.15/4.0.7

Timelineinfo

02/23/2016 🔍
02/24/2016 +1 days 🔍
02/26/2016 +1 days 🔍
02/27/2016 +1 days 🔍
02/27/2016 +0 days 🔍
02/28/2016 +1 days 🔍
07/08/2022 +2322 days 🔍

Sourcesinfo

Vendor: squid-cache.org

Advisory: RHSA-2016:2600
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2016-2570 (🔍)
GCVE (CVE): GCVE-0-2016-2570
GCVE (VulDB): GCVE-100-81109
X-Force: 111078 - Squid Edge Side Includes denial of service
SecurityTracker: 1035101

See also: 🔍

Entryinfo

Created: 02/28/2016 21:36
Updated: 07/08/2022 15:45
Changes: 02/28/2016 21:36 (58), 08/16/2018 07:33 (20), 07/08/2022 15:45 (5)
Complete: 🔍
Cache ID: 216::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 ▸

Do you need the next level of professionalism?

Upgrade your account now!