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CVE-2020-15811

Status Candidate

Overview

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.

Related Files

Red Hat Security Advisory 2020-3623-01
Posted Sep 3, 2020
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2020-3623-01 - Squid is a high-performance proxy caching server for web clients, supporting FTP, Gopher, and HTTP data objects. Issues addressed include a HTTP request smuggling vulnerability.

tags | advisory, web
systems | linux, redhat
advisories | CVE-2020-15810, CVE-2020-15811
MD5 | ddb845760e3fe557d5f94b143c3f5342
Ubuntu Security Notice USN-4477-1
Posted Aug 27, 2020
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4477-1 - Amit Klein discovered that Squid incorrectly validated certain data. A remote attacker could possibly use this issue to perform an HTTP request smuggling attack, resulting in cache poisoning. RĂ©gis Leroy discovered that Squid incorrectly validated certain data. A remote attacker could possibly use this issue to perform an HTTP request splitting attack, resulting in cache poisoning. Lubos Uhliarik discovered that Squid incorrectly handled certain Cache Digest response messages sent by trusted peers. A remote attacker could possibly use this issue to cause Squid to consume resources, resulting in a denial of service. Various other issues were also addressed.

tags | advisory, remote, web, denial of service
systems | linux, ubuntu
advisories | CVE-2020-15810, CVE-2020-15811, CVE-2020-24606
MD5 | 44c77ca040383d52dd8b135b79c2c848
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