Dropbear SSH Server Use After Free Remote Code Execution Vulnerability

Bugtraq ID:	52159
Class:	Design Error
CVE:	CVE-2012-0920
Remote:	Yes
Local:	No
Published:	Feb 24 2012 12:00AM
Updated:	May 23 2017 04:28PM
Credit:	Danny Fullerton
Vulnerable:	Oracle Communications Session Border Controller SCZ7.4.0 Oracle Communications Session Border Controller SCZ7.3.0 Oracle Communications Session Border Controller SCZ7.2.0 Gentoo Linux Dropbear SSH Server 2011.54 Dropbear SSH Server 0.52 Debian Linux 6.0 sparc Debian Linux 6.0 s/390 Debian Linux 6.0 powerpc Debian Linux 6.0 mips Debian Linux 6.0 ia-64 Debian Linux 6.0 ia-32 Debian Linux 6.0 arm Debian Linux 6.0 amd64
Not Vulnerable:	Dropbear SSH Server 2012.55

Dropbear SSH Server Use After Free Remote Code Execution Vulnerability

Dropbear SSH Server is prone to a remote code-execution vulnerability due to a use-after-free error.

An attacker can leverage this issue to execute arbitrary code with root-level privileges. This may allow an attacker to fully compromise the vulnerable system.

Note: To exploit the issue an attacker must be authenticated using a public key and a command restriction is enforced.

Dropbear SSH Server versions from 0.52 to 2011.54 are vulnerable.

Dropbear SSH Server Use After Free Remote Code Execution Vulnerability

Currently we are not aware of any working exploits. If you feel we are in error or if you are aware of more recent information, please mail us at: [email protected].

Dropbear SSH Server Use After Free Remote Code Execution Vulnerability

Solution:
Updates are available. Please see the references for more information.

Dropbear SSH Server Use After Free Remote Code Execution Vulnerability

References:

• dropbear changeset 654:818108bf7749 (Dropbear)
  
• Dropbear SSH Server Homepage (Dropbear)
  
• Oracle Critical Patch Update Advisory - April 2017 (Oracle)