Dropbear: Multiple vulnerabilities — GLSA 201702-23

Multiple vulnerabilities have been found in Dropbear, the worst of which allows remote attackers to execute arbitrary code.

Affected Packages

net-misc/dropbear on all architectures
Affected versions < 2016.74
Unaffected versions >= 2016.74

Background

Dropbear is an SSH server and client designed with a small memory footprint.

Description

Multiple vulnerabilities have been discovered in Dropbear. Please review the CVE identifiers referenced below for details.

Impact

A remote attacker could possibly execute arbitrary code with root privileges if usernames containing special characters can be created on a system. Also, a dbclient user who can control username or host arguments could potentially run arbitrary code with the privileges of the process.

In addition, a remote attacker could entice a user to process a specially crafted SSH key using dropbearconvert, possibly resulting in execution of arbitrary code with the privileges of the process or a Denial of Service condition.

Workaround

There is no known workaround at this time.

Resolution

All Dropbear users should upgrade to the latest version:

 # emerge --sync
 # emerge --ask --oneshot --verbose ">=net-misc/dropbear-2016.74"
 

References

Release Date
February 20, 2017

Latest Revision
February 20, 2017: 1

Severity
normal

Exploitable
remote

Bugzilla entries