CVE-2019-12529

Impact:
Moderate
Public Date:
2019-07-11
CWE:
CWE-119
Bugzilla:
1730528: CVE-2019-12529 squid: OOB read in Proxy-Authorization header causes DoS

The MITRE CVE dictionary describes this issue as:

An issue was discovered in Squid 2.x through 2.7.STABLE9, 3.x through 3.5.28, and 4.x through 4.7. When Squid is configured to use Basic Authentication, the Proxy-Authorization header is parsed via uudecode. uudecode determines how many bytes will be decoded by iterating over the input and checking its table. The length is then used to start decoding the string. There are no checks to ensure that the length it calculates isn't greater than the input buffer. This leads to adjacent memory being decoded as well. An attacker would not be able to retrieve the decoded data unless the Squid maintainer had configured the display of usernames on error pages.

Find out more about CVE-2019-12529 from the MITRE CVE dictionary dictionary and NIST NVD.

Statement

Red Hat Enterprise Linux 5:
This vulnerability has been rated as having a security impact of Moderate. After evaluation and in accordance with the criteria noted in the product support life cycle, there are no plans to address this issue in an upcoming release. Please contact Red Hat Support for further information.

Red Hat Enterprise Linux 6:
This vulnerability has been rated as having a security impact of Moderate. After evaluation and in accordance with the criteria noted in the product support life cycle, there are no plans to address this issue in an upcoming release. Please contact Red Hat Support for further information.

Red Hat Enterprise Linux 7:
This vulnerability is currently targeted to be addressed in an upcoming release.

Red Hat Enterprise Linux 8:
This vulnerability is currently targeted to be addressed in an upcoming release.

CVSS v3 metrics

NOTE: The following CVSS v3 metrics and score provided are preliminary and subject to review.

CVSS3 Base Score 4.3
CVSS3 Base Metrics CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Attack Vector Adjacent Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality None
Integrity Impact None
Availability Impact Low

Affected Packages State

Platform Package State
Red Hat Enterprise Linux 8 squid Affected
Red Hat Enterprise Linux 7 squid Affected
Red Hat Enterprise Linux 6 squid34 Out of support scope
Red Hat Enterprise Linux 6 squid Out of support scope
Red Hat Enterprise Linux 5 squid Out of support scope
Unless explicitly stated as not affected, all previous versions of packages in any minor update stream of a product listed here should be assumed vulnerable, although may not have been subject to full analysis.

Mitigation

Remove 'auth_param basic ...' configuration settings from squid.conf

External References

Last Modified

CVE description copyright © 2017, The MITRE Corporation