Bug 800655 - (CVE-2012-0920) CVE-2012-0920 dropbear: use-after-free vulnerability
CVE-2012-0920 dropbear: use-after-free vulnerability
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
All Linux
high Severity high
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Assigned To: Red Hat Product Security
: Security
Depends On: 800656 800657
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Reported: 2012-03-06 16:20 EST by Vincent Danen
Modified: 2014-08-29 12:29 EDT (History)
4 users (show)

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Doc Type: Bug Fix
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Last Closed: 2012-08-03 13:27:22 EDT
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Description Vincent Danen 2012-03-06 16:20:32 EST
It was reported [1] that the Dropbear SSH server suffered from a use-after-free flaw in how the server managed channels concurrency.  A specially-crafted request could trigger a use-after-free condition which could then be used to potentially execute arbitrary code with root privileges, provided that the user has been authenticated using a public key and also that a command restriction is enforced (the "command" option must be used in the authorized_keys file).

This has been corrected upstream in version 2012.55 [2] and is reported to affect versions 0.52 through 2011.54.

[1] http://archives.neohapsis.com/archives/fulldisclosure/2012-02/0404.html
[2] https://secure.ucc.asn.au/hg/dropbear/rev/818108bf7749
Comment 1 Vincent Danen 2012-03-06 16:36:39 EST
Tracking bugs were filed for:

Fedora-all: bug #800656
EPEL-6: bug #800657
Comment 2 Vincent Danen 2012-08-03 13:27:22 EDT
dropbear-0.55-1 has been pushed to all supported versions of Fedora and EPEL:


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