Overly broad permissions can turn one compromised account into a much larger security problem. Learn how to reduce unnecessary access, review privileges, and apply least privilege across modern Linux systems. Review Linux Privileges×

Alerts This Week
Warning Icon 1 507
Alerts This Week
Warning Icon 1 507

Ubuntu 20.04 LTS USN-5936-1 Critical Samba Denial Of Service

ubuntu
Calendar Grey March 8, 2023
Scroller Ubuntu
Urgent Samba patches released for Ubuntu 20.04 LTS. Main concerns involve potential denial of service and privilege escalation risks.
Several security issues were fixed in Samba.

Summary

Several security issues were fixed in Samba.

Software Description:

- samba: SMB/CIFS file, print, and login server for Unix

Details:

Evgeny Legerov discovered that Samba incorrectly handled buffers in

certain GSSAPI routines of Heimdal. A remote attacker could possibly use

this issue to cause Samba to crash, resulting in a denial of service.

(CVE-2022-3437)

Tom Tervoort discovered that Samba incorrectly used weak rc4-hmac Kerberos

keys. A remote attacker could possibly use this issue to elevate

privileges. (CVE-2022-37966, CVE-2022-37967)

It was discovered that Samba supported weak RC4/HMAC-MD5 in NetLogon Secure

Channel. A remote attacker could possibly use this issue to elevate

privileges. (CVE-2022-38023)

Greg Hudson discovered that Samba incorrectly handled PAC parsing. On

32-bit systems, a remote attacker could use this issue to escalate

privileges, or possibly execute arbitrary code. (CVE-2022-42898)

Joseph Sutton discovered that Samba could be...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service critical remote code execution privilege escalation samba ubuntu

Update Instructions

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 20.04 LTS:
   samba                           2:4.15.13+dfsg-0ubuntu0.20.04.1

This update uses a new upstream release, which includes additional bug
fixes. In general, a standard system update will make all the necessary
changes.

References

https://ubuntu.com/security/notices/USN-5936-1

CVE-2022-3437, CVE-2022-37966, CVE-2022-37967, CVE-2022-38023,

CVE-2022-42898, CVE-2022-45141

Severity
critical
Lowest
Low
Medium
High
Critical

March 08, 2023

Topics%20covered

Topics Covered

security advisory denial of service critical remote code execution privilege escalation samba ubuntu

Package Information

https://launchpad.net/ubuntu/+source/samba/2:4.15.13+dfsg-0ubuntu0.20.04.1

Get the latest News and Insights

Get the latest Linux and open source security news straight to your inbox.