VDB-154311 · CVE-2020-11945 · GCVE-0-2020-11945

Squid Web Proxy up to 5.0.1 Digest Authentication Nonce handler integer overflow

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.
7.6	$0-$5k	0.00

Summaryinfo

A vulnerability has been found in Squid Web Proxy up to 5.0.1 and classified as critical. This vulnerability affects unknown code of the component Digest Authentication Nonce handler. Performing a manipulation results in integer overflow. This vulnerability is identified as CVE-2020-11945. The attack can be initiated remotely. There is not any exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Squid Web Proxy up to 5.0.1 (Firewall Software). It has been classified as critical. This affects an unknown part of the component Digest Authentication Nonce handler. The manipulation with an unknown input leads to a integer overflow vulnerability. CWE is classifying the issue as CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

An issue was discovered in Squid before 5.0.2. A remote attacker can replay a sniffed Digest Authentication nonce to gain access to resources that are otherwise forbidden. This occurs because the attacker can overflow the nonce reference counter (a short integer). Remote code execution may occur if the pooled token credentials are freed (instead of replayed as valid credentials).

The weakness was released 04/23/2020 (oss-sec). It is possible to read the advisory at openwall.com. This vulnerability is uniquely identified as CVE-2020-11945 since 04/20/2020. The exploitability is told to be difficult. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly available.

Upgrading to version 5.0.2 eliminates this vulnerability.

Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

Firewall Software

Vendor

Squid

Name

Web Proxy

Version

License

open-source

Website

Vendor: http://www.squid-cache.org/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.7
VulDB Meta Temp Score: 7.6

VulDB Base Score: 5.6
VulDB Temp Score: 5.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 9.8
NVD Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

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

NVD Base Score: 🔍

Exploitinginfo

Class: Integer overflow
CWE: CWE-190 / CWE-189
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Web Proxy 5.0.2
Patch: github.com

Timelineinfo

04/20/2020 🔍
04/23/2020 +3 days 🔍
04/24/2020 +1 days 🔍
06/02/2024 +1500 days 🔍

Sourcesinfo

Vendor: squid-cache.org

Advisory: eeebf0f37a72a2de08348e85ae34b02c34e9a811
Status: Not defined
Confirmation: 🔍

CVE: CVE-2020-11945 (🔍)
GCVE (CVE): GCVE-0-2020-11945
GCVE (VulDB): GCVE-100-154311

Entryinfo

Created: 04/24/2020 07:34
Updated: 06/02/2024 11:42
Changes: 04/24/2020 07:34 (40), 04/24/2020 07:39 (18), 10/12/2020 14:42 (1), 06/02/2024 11:35 (19), 06/02/2024 11:42 (2)
Complete: 🔍
Cache ID: 216::103