NetSight
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medium6.5

CVE-2020-15810

An issue was discovered in Squid before 4.13 and 5.x before 5.0.4.

Impact

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 products

VendorProductAffected versions
Squid-CacheSquid
before 4.13
from 5.0 before 5.0.4
CanonicalUbuntu Linux
Versions 16.04, 18.04, 20.04
DebianDebian Linux
Versions 9.0, 10.0
FedoraprojectFedora
Versions 31, 32, 33
OpensuseLeap
Versions 15.1, 15.2

Weakness classification

CWE-444

References