Vulnerabilities
Misconfiguration
Runtime Security
Compliance
CVE Vulnerabilities

CVE-2019-18677

Cross-Site Request Forgery (CSRF)

Published: Nov 26, 2019 | Modified: Nov 07, 2023
CVSS 3.x
6.1
MEDIUM
Source:
NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CVSS 2.x
5.8 MEDIUM
AV:N/AC:M/Au:N/C:P/I:P/A:N
RedHat/V2
RedHat/V3
7.4 MODERATE
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Ubuntu
MEDIUM
Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2019-18677
CWEhttps://cwe.mitre.org/data/definitions/352.html

An issue was discovered in Squid 3.x and 4.x through 4.8 when the append_domain setting is used (because the appended characters do not properly interact with hostname length restrictions). Due to incorrect message processing, it can inappropriately redirect traffic to origins it should not be delivered to.

Weakness

The web application does not, or can not, sufficiently verify whether a well-formed, valid, consistent request was intentionally provided by the user who submitted the request.

Affected Software

Name Vendor Start Version End Version
Squid Squid-cache 2.0 (including) 2.7 (including)
Squid Squid-cache 3.0 (including) 3.5.28 (including)
Squid Squid-cache 4.0 (including) 4.8 (including)
Squid Squid-cache 2.7-stable2 (including) 2.7-stable2 (including)
Squid Squid-cache 2.7-stable3 (including) 2.7-stable3 (including)
Squid Squid-cache 2.7-stable4 (including) 2.7-stable4 (including)
Squid Squid-cache 2.7-stable5 (including) 2.7-stable5 (including)
Squid Squid-cache 2.7-stable6 (including) 2.7-stable6 (including)
Squid Squid-cache 2.7-stable7 (including) 2.7-stable7 (including)
Squid Squid-cache 2.7-stable8 (including) 2.7-stable8 (including)
Squid Squid-cache 2.7-stable9 (including) 2.7-stable9 (including)
Red Hat Enterprise Linux 8 RedHat squid:4-8030020200828070549.30b713e6 *
Squid Ubuntu devel *
Squid Ubuntu disco *
Squid Ubuntu eoan *
Squid Ubuntu focal *
Squid Ubuntu groovy *
Squid Ubuntu hirsute *
Squid Ubuntu trusty *
Squid Ubuntu upstream *
Squid3 Ubuntu bionic *
Squid3 Ubuntu precise/esm *
Squid3 Ubuntu trusty *
Squid3 Ubuntu xenial *

Potential Mitigations

  • Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
  • For example, use anti-CSRF packages such as the OWASP CSRFGuard. [REF-330]
  • Another example is the ESAPI Session Management control, which includes a component for CSRF. [REF-45]
  • Use the “double-submitted cookie” method as described by Felten and Zeller:
  • When a user visits a site, the site should generate a pseudorandom value and set it as a cookie on the user’s machine. The site should require every form submission to include this value as a form value and also as a cookie value. When a POST request is sent to the site, the request should only be considered valid if the form value and the cookie value are the same.
  • Because of the same-origin policy, an attacker cannot read or modify the value stored in the cookie. To successfully submit a form on behalf of the user, the attacker would have to correctly guess the pseudorandom value. If the pseudorandom value is cryptographically strong, this will be prohibitively difficult.
  • This technique requires Javascript, so it may not work for browsers that have Javascript disabled. [REF-331]

References

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