HTTP: Squid Proxy Authorization Denail Of Service
This signature detects attempts to exploit a known vulnerability against Squid Proxy. A successful attack can lead to Denial of service.
Extended Description
An issue was discovered in Squid 3.3.9 through 3.5.28 and 4.x through 4.7. When Squid is configured to use Digest authentication, it parses the header Proxy-Authorization. It searches for certain tokens such as domain, uri, and qop. Squid checks if this token's value starts with a quote and ends with one. If so, it performs a memcpy of its length minus 2. Squid never checks whether the value is just a single quote (which would satisfy its requirements), leading to a memcpy of its length minus 1.
Affected Products
Debian debian_linux
References
CVE: CVE-2019-12525
Short Name
HTTP:HEADER:SQUID-PROXY-AUTH
Severity
Major
Recommended
False
Recommended Action
None
Category
HTTP
Keywords
Authorization CVE-2019-12525 Denail Of Proxy Service Squid
Release Date
01/05/2020
Supported Platforms
srx-branch-12.3
srx-19.3
srx-branch-19.3
vsrx3bsd-19.2
srx-branch-19.4
vsrx-19.4
mx-12.3
mx-19.4
vmx-19.4
mx-19.3
vsrx3bsd-19.4
srx-19.4
vsrx-12.3
vmx-19.3
vsrx-19.2
srx-12.3
Sigpack Version
3590
False Positive
Unknown
Vendors
Opensuse
Fedoraproject
Squid-cache
Debian
Canonical
CVSS Score
7.5