A vulnerability classified as critical was found in Squid Web Proxy up to 4.11/5.0.2 (Firewall Software). This vulnerability affects some unknown processing of the file http/ContentLengthInterpreter.cc. The manipulation as part of a HTTP Request leads to a request smuggling vulnerability. The CWE definition for the vulnerability is CWE-444. The product acts as an intermediary HTTP agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed HTTP requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

An issue was discovered in http/ContentLengthInterpreter.cc in Squid before 4.12 and 5.x before 5.0.3. A Request Smuggling and Poisoning attack can succeed against the HTTP cache. The client sends an HTTP request with a Content-Length header containing "+\ "-" or an uncommon shell whitespace character prefix to the length field-value.

The weakness was disclosed 06/30/2020 (GitHub Repository). The advisory is shared for download at github.com. This vulnerability was named CVE-2020-15049 since 06/25/2020. The attack can be initiated remotely. Required for exploitation is a single authentication. There are known technical details, but no exploit is available.

Upgrading to version 4.12 or 5.0.3 eliminates this vulnerability.

Productinfo

Type

• Firewall Software

Vendor

• Squid

Name

• Web Proxy

Version

• 4.0
• 4.1
• 4.2
• 4.3
• 4.4
• 4.5
• 4.6
• 4.7
• 4.8
• 4.9
• 4.10
• 4.11
• 5.0.0
• 5.0.1
• 5.0.2

License

• open-source

CPE 2.3info

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CPE 2.2info

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