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Dropbear SSH Server Use-After-Free

Dropbear SSH Server Use-After-Free
Posted Feb 24, 2012
Authored by Danny Fullerton

The Dropbear SSH server suffers from a use-after-free vulnerability that allows for arbitrary code execution.

tags | advisory, arbitrary, code execution
advisories | CVE-2012-0920
MD5 | 8326671660b7dbfd6d85df752e9322e6

Dropbear SSH Server Use-After-Free

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Dropbear SSH server use-after-free vulnerability

Impact: A remote authenticated user can execute arbitrary code on the
target system.
Class: Use After Free - CWE-416
CVE ID: CVE-2012-0920
CVSS: 8.5 (AV:N/AC:M/AU:S/C:C/I:C/A:C)

Description:
This vulnerability is located within the Dropbear daemon and occurs due
to the way the server manages channels concurrency. A specially crafted
request can trigger a `use after free` condition which can be used to
execute arbitrary code under root privileges provided the user has been
authenticated using a public key (authorized_keys file) and a command
restriction is enforced (command option).

Solution: Upgrade to version 2012.55 or higher.

Reference: https://secure.ucc.asn.au/hg/dropbear/rev/818108bf7749

Disclosure Timeline:
2012-01-24 - Vulnerability reported to vendor.
2012-02-24 - Coordinated public release of advisory.

Credit:
This vulnerability was discovered by Danny Fullerton from Mantor
Organization.
Special thanks to Matt.

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