Squid Web Proxy up to 4.12/5.0.3 Locking peer_digest.cc peerDigestHandleReply Response denial of service

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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8.2$0-$5k0.00

Summaryinfo

A vulnerability labeled as problematic has been found in Squid Web Proxy up to 4.12/5.0.3. This affects the function peerDigestHandleReply of the file peer_digest.cc of the component Locking. The manipulation as part of Response results in denial of service. This vulnerability is reported as CVE-2020-24606. The attack can be launched remotely. No exploit exists. The affected component should be upgraded.

Detailsinfo

A vulnerability, which was classified as critical, was found in Squid Web Proxy up to 4.12/5.0.3 (Firewall Software). Affected is the function peerDigestHandleReply of the file peer_digest.cc of the component Locking. The manipulation as part of a Response leads to a denial of service vulnerability. CWE is classifying the issue as CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. This is going to have an impact on availability. CVE summarizes:

Squid before 4.13 and 5.x before 5.0.4 allows a trusted peer to perform Denial of Service by consuming all available CPU cycles during handling of a crafted Cache Digest response message. This only occurs when cache_peer is used with the cache digests feature. The problem exists because peerDigestHandleReply() livelocking in peer_digest.cc mishandles EOF.

The weakness was disclosed 08/24/2020. This vulnerability is traded as CVE-2020-24606 since 08/24/2020. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1499.

Upgrading to version 4.13 or 5.0.4 eliminates this vulnerability.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.6
VulDB Meta Temp Score: 8.4

VulDB Base Score: 8.6
VulDB Temp Score: 8.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 8.6
NVD Vector: 🔍

CVSSv2info

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

Exploitinginfo

Class: Denial of service
CWE: 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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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Web Proxy 4.13/5.0.4

Timelineinfo

08/24/2020 🔍
08/24/2020 +0 days 🔍
08/25/2020 +1 days 🔍
11/11/2020 +78 days 🔍

Sourcesinfo

Vendor: squid-cache.org

Status: Not defined

CVE: CVE-2020-24606 (🔍)
GCVE (CVE): GCVE-0-2020-24606
GCVE (VulDB): GCVE-100-160212

Entryinfo

Created: 08/25/2020 06:45
Updated: 11/11/2020 07:17
Changes: 08/25/2020 06:45 (40), 08/25/2020 06:50 (12), 11/11/2020 07:17 (1)
Complete: 🔍
Cache ID: 216::103

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