medium
6.5
CWE
444 20 697
Advisory Published
Updated

CVE-2020-15811: Input Validation

First published: Mon Aug 24 2020(Updated: )

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.

Credit: cve@mitre.org cve@mitre.org cve@mitre.org

Affected SoftwareAffected VersionHow to fix
Squid-Cache Squid<4.13
Squid-Cache Squid>=5.0<5.0.4
Canonical Ubuntu Linux=16.04
Canonical Ubuntu Linux=18.04
Canonical Ubuntu Linux=20.04
Debian Debian Linux=9.0
Debian Debian Linux=10.0
Fedoraproject Fedora=31
Fedoraproject Fedora=32
Fedoraproject Fedora=33
openSUSE Leap=15.1
openSUSE Leap=15.2
debian/squid<=4.12-1<=4.6-1<=4.6-1+deb10u3
4.13-1
4.6-1+deb10u4
IBM Security Guardium<=10.5
IBM Security Guardium<=10.6
IBM Security Guardium<=11.0
IBM Security Guardium<=11.1
IBM Security Guardium<=11.2
IBM Security Guardium<=11.3
ubuntu/squid<4.10-1ubuntu1.2
4.10-1ubuntu1.2
ubuntu/squid<4.13-1ubuntu1
4.13-1ubuntu1
ubuntu/squid<4.13-1ubuntu1
4.13-1ubuntu1
ubuntu/squid3<3.5.27-1ubuntu1.9
3.5.27-1ubuntu1.9
ubuntu/squid3<3.5.12-1ubuntu7.15
3.5.12-1ubuntu7.15
debian/squid
4.6-1+deb10u7
4.6-1+deb10u10
4.13-10+deb11u2
4.13-10+deb11u3
5.7-2
5.7-2+deb12u1
6.6-1
6.9-1

Remedy

https://github.com/squid-cache/squid/security/advisories/GHSA-c7p8-xqhm-49wv

Remedy

http://www.squid-cache.org/Versions/v4/changesets/SQUID-2020_8.patch

Remedy

https://github.com/squid-cache/squid/commit/fd68382860633aca92065e6c343cfd1b12b126e7

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is the vulnerability ID of this issue?

    The vulnerability ID of this issue is CVE-2020-15811.

  • What is the severity of CVE-2020-15811?

    The severity of CVE-2020-15811 is medium.

  • What is the affected software?

    The affected software is Squid-Cache Squid versions before 4.13 and 5.x before 5.0.4.

  • What is the impact of this vulnerability?

    This vulnerability allows HTTP Request Splitting attacks to succeed against HTTP and HTTPS traffic, leading to cache poisoning.

  • How can I fix CVE-2020-15811?

    To fix CVE-2020-15811, upgrade to Squid version 4.13 or 5.0.4 or later.

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