CVE-2013-4434
First published: Fri Oct 25 2013(Updated: )
Dropbear SSH Server before 2013.59 generates error messages for a failed logon attempt with different time delays depending on whether the user account exists, which allows remote attackers to discover valid usernames.
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Dropbear SSH | <2013.59 |
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Reference Links
- http://lists.opensuse.org/opensuse-updates/2013-10/msg00061.html
- http://lists.opensuse.org/opensuse-updates/2013-11/msg00046.html
- http://secunia.com/advisories/55173
- http://www.openwall.com/lists/oss-security/2013/10/16/11
- http://www.securityfocus.com/bid/62993
- https://matt.ucc.asn.au/dropbear/CHANGES
- https://secure.ucc.asn.au/hg/dropbear/rev/d7784616409a
- https://support.citrix.com/article/CTX216642
Frequently Asked Questions
What is the severity of CVE-2013-4434?
CVE-2013-4434 is classified as a medium severity vulnerability due to the potential for username enumeration.
How do I fix CVE-2013-4434?
To fix CVE-2013-4434, upgrade the Dropbear SSH Server to version 2013.59 or later.
What does CVE-2013-4434 allow attackers to do?
CVE-2013-4434 allows remote attackers to potentially discover valid usernames by observing the timing of error messages during failed login attempts.
Which versions of Dropbear SSH are affected by CVE-2013-4434?
CVE-2013-4434 affects all versions of Dropbear SSH before 2013.59.
Is CVE-2013-4434 a configuration issue?
CVE-2013-4434 is a vulnerability in the Dropbear SSH server implementation, not a configuration issue.
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