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Gentoo: GLSA-201702-23 Normal: Remote Code Execution Risk in Dropbear

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Calendar Grey February 21, 2017
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Several security flaws in Dropbear SSH enable remote adversaries to run arbitrary commands. Update advised for protection.
Multiple vulnerabilities have been found in Dropbear, the worst of which allows remote attackers to execute arbitrary code.

Summary

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

Topics%20covered

Topics Covered

security advisory network security Gentoo code execution remote access advisory Dropbear

Resolution

All Dropbear users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose ">=net-misc/dropbear-2016.74"

References

[ 1 ] CVE-2016-7406 http://nvd.nist.gov/nvd.cfm?cvename=CVE-2016-7406 [ 2 ] CVE-2016-7407 http://nvd.nist.gov/nvd.cfm?cvename=CVE-2016-7407 [ 3 ] CVE-2016-7408 http://nvd.nist.gov/nvd.cfm?cvename=CVE-2016-7408 [ 4 ] CVE-2016-7409 http://nvd.nist.gov/nvd.cfm?cvename=CVE-2016-7409

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: https://security.gentoo.org/glsa/201702-23
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Concerns

Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users' machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.

Severity: Normal
Title: Dropbear: Multiple vulnerabilities
Date: February 20, 2017
Bugs: #605560
ID: 201702-23

Topics%20covered

Topics Covered

security advisory network security Gentoo code execution remote access advisory Dropbear

Synopsis

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

Background

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

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Affected Packages

------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 net-misc/dropbear < 2016.74 >= 2016.74

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.