VDB-157487 · CVE-2020-14059 · GCVE-0-2020-14059

Squid Web Proxy up to 5.2 Synchronization Ipc::Mem::PageStack::pop improper synchronization

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.
5.1	$0-$5k	0.00

Summaryinfo

A vulnerability, which was classified as problematic, has been found in Squid Web Proxy up to 5.2. Affected by this vulnerability is the function Ipc::Mem::PageStack::pop of the component Synchronization. The manipulation leads to improper synchronization. This vulnerability is uniquely identified as CVE-2020-14059. The attack is possible to be carried out remotely. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Squid Web Proxy up to 5.2 (Firewall Software) and classified as problematic. This issue affects the function Ipc::Mem::PageStack::pop of the component Synchronization. The manipulation with an unknown input leads to a improper synchronization vulnerability. Using CWE to declare the problem leads to CWE-662. The product utilizes multiple threads or processes to allow temporary access to a shared resource that can only be exclusive to one process at a time, but it does not properly synchronize these actions, which might cause simultaneous accesses of this resource by multiple threads or processes. Impacted is availability. The summary by CVE is:

An issue was discovered in Squid 5.x before 5.0.3. Due to an Incorrect Synchronization, a Denial of Service can occur when processing objects in an SMP cache because of an Ipc::Mem::PageStack::pop ABA problem during access to the memory page/slot management list.

The weakness was disclosed 06/30/2020 (Website). It is possible to read the advisory at squid-cache.org. The identification of this vulnerability is CVE-2020-14059 since 06/13/2020. The exploitation is known to be easy. The attack may be initiated remotely. The successful exploitation needs a simple authentication. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 5.3 eliminates this vulnerability.

The entry VDB-157486 is pretty similar. 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: 5.4
VulDB Meta Temp Score: 5.3

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.5
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: Improper synchronization
CWE: CWE-662
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 5.3

Timelineinfo

06/13/2020 🔍
06/30/2020 +17 days 🔍
07/01/2020 +1 days 🔍
10/28/2020 +119 days 🔍

Sourcesinfo

Vendor: squid-cache.org

Advisory: squid-cache.org
Status: Not defined
Confirmation: 🔍

CVE: CVE-2020-14059 (🔍)
GCVE (CVE): GCVE-0-2020-14059
GCVE (VulDB): GCVE-100-157487
See also: 🔍

Entryinfo

Created: 07/01/2020 09:05
Updated: 10/28/2020 08:24
Changes: 07/01/2020 09:05 (41), 07/01/2020 09:10 (18), 10/28/2020 08:24 (1)
Complete: 🔍
Cache ID: 216::103