CVE-2022-3437

Description

A heap-based buffer overflow vulnerability was found in Samba within the GSSAPI unwrap_des() and unwrap_des3() routines of Heimdal. The DES and Triple-DES decryption routines in the Heimdal GSSAPI library allow a length-limited write buffer overflow on malloc() allocated memory when presented with a maliciously small packet. This flaw allows a remote user to send specially crafted malicious data to the application, possibly resulting in a denial of service (DoS) attack.

How to fix CVE-2022-3437

To remediate CVE-2022-3437, upgrade the affected package to a fixed version below.

• —upgrade to 7.7.1-r0 or later
• —upgrade to 4.15.12-r0 or later
• —upgrade to 7.7.0+dfsg-2+deb11u2 or later
• —upgrade to 2:4.13.13+dfsg-1~deb11u6 or later

Is CVE-2022-3437 being exploited?

Low — EPSS is 0.7%, meaning exploitation activity has not been observed at scale.

Affected packages (4)

• from 0, < 7.7.1-r0
• from 0, < 4.15.12-r0
• from 0, < 7.7.0+dfsg-2+deb11u2
• from 0, < 2:4.13.13+dfsg-1~deb11u6

CVSS scores

References (2)

• ADVISORYsecurity.alpinelinux.org/vuln/CVE-2022-3437
• ADVISORYsecurity-tracker.debian.org/tracker/CVE-2022-3437