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Ubuntu: (Multiple Advisories) (CVE-2020-15811): Squid vulnerabilities

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Ubuntu: (Multiple Advisories) (CVE-2020-15811): Squid vulnerabilities

Severity
4
CVSS
(AV:N/AC:L/Au:S/C:N/I:P/A:N)
Published
08/27/2020
Created
09/01/2020
Added
08/28/2020
Modified
03/22/2023

Description

An issue was discovered in Squid before 4.13 and 5.x before 5.0.4. Due to incorrect data validation, HTTP Request Splitting 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 browser cache and any downstream caches with content from an arbitrary source. Squid uses a string search instead of parsing the Transfer-Encoding header to find chunked encoding. This allows an attacker to hide a second request inside Transfer-Encoding: it is interpreted by Squid as chunked and split out into a second request delivered upstream. Squid will then deliver two distinct responses to the client, corrupting any downstream caches.

Solution(s)

  • ubuntu-upgrade-squid

References

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