Ubuntu 20.04 LTS: USN-4409-1 Critical: Samba Denial of Service

ubuntu

July 2, 2020

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:

Andrew Bartlett discovered that Samba incorrectly handled certain LDAP queries.

A remote attacker could use this issue to cause Samba to crash, resulting

in a denial of service, or possibly execute arbitrary code. This issue only

affected Ubuntu 18.04 LTS, Ubuntu 19.10 and Ubuntu 20.04 LTS. (CVE-2020-10730)

Douglas Bagnall discovered that Samba incorrectly handled certain queries.

A remote attacker could possibly use this issue to cause a denial of service.

(CVE-2020-10745)

Andrei Popa discovered that Samba incorrectly handled certain LDAP queries.

A remote attacker could use this issue to cause Samba to crash, resulting

in a denial of service, or possibly execute arbitrary code. This issue only

affected Ubuntu 18.04 LTS, Ubuntu 19.10 and Ubuntu 20.04 LTS.

(CVE-2020-10760)

Topics Covered

security advisory denial of service security issue samba Ubuntu

Update Instructions

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

Ubuntu 20.04 LTS:
  samba                           2:4.11.6+dfsg-0ubuntu1.3

Ubuntu 19.10:
  samba                           2:4.10.7+dfsg-0ubuntu2.6

Ubuntu 18.04 LTS:
  samba                           2:4.7.6+dfsg~ubuntu-0ubuntu2.17

Ubuntu 16.04 LTS:
  samba                           2:4.3.11+dfsg-0ubuntu0.16.04.28

Ubuntu 14.04 ESM:
  samba                           2:4.3.11+dfsg-0ubuntu0.14.04.20+esm7

Ubuntu 12.04 ESM:
  samba                           2:3.6.25-0ubuntu0.12.04.20

In general, a standard system update will make all the necessary changes.