CVE-2019-12529

Description

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.

How to fix CVE-2019-12529

To remediate CVE-2019-12529, upgrade the affected package to a fixed version below.

• —upgrade to 4.8-r0 or later
• —upgrade to 4.8-1 or later

Is CVE-2019-12529 being exploited?

Moderate — EPSS is 17.5%. Track this CVE but it's not at the top of the prioritisation list.

Affected packages (2)

• from 0, < 4.8-r0
• from 0, < 4.8-1

CVSS scores

References (2)

• ADVISORYsecurity.alpinelinux.org/vuln/CVE-2019-12529
• ADVISORYsecurity-tracker.debian.org/tracker/CVE-2019-12529