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Vulnerability · Published Sep 2, 2020 · Assigned by mitre

CVE-2020-15810

Medium 6.5

In plain English

A medium-severity security flaw in the squid package (Alpine). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 2.4% (higher than 84% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)6.5Medium
Exploit odds (30 days)2.4%top 15.7% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official description

An issue was discovered in Squid before 4.13 and 5.x before 5.0.4. Due to incorrect data validation, HTTP Request Smuggling attacks may succeed against HTTP and HTTPS traffic. This leads to cache poisoning. This allows any client, including browser scripts, to bypass local security and poison the proxy cache and any downstream caches with content from an arbitrary source. When configured for relaxed header parsing (the default), Squid relays headers containing whitespace characters to upstream servers. When this occurs as a prefix to a Content-Length header, the frame length specified will be ignored by Squid (allowing for a conflicting length to be used from another Content-Length header) but relayed upstream.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.20squid4.13.0-r0ALPINE-CVE-2020-15810
Alpine:v3.21squid4.13.0-r0ALPINE-CVE-2020-15810
Alpine:v3.22squid4.13.0-r0ALPINE-CVE-2020-15810
Alpine:v3.23squid4.13.0-r0ALPINE-CVE-2020-15810
Alpine:v3.24squid4.13.0-r0ALPINE-CVE-2020-15810
Debian:12squid4.13-1DEBIAN-CVE-2020-15810
Debian:13squid4.13-1DEBIAN-CVE-2020-15810
Debian:14squid4.13-1DEBIAN-CVE-2020-15810
Rocky Linux:8libecap0:1.0.1-2.module+el8.4.0+404+316a0dc5RLSA-2020:3623

Affected products (as reported)

VendorProductVersions
n/a n/a n/a

References