Dropbear Remote Denial Of Service Vulnerability

BID:17024

Info

Dropbear Remote Denial Of Service Vulnerability

Bugtraq ID: 17024
Class: Failure to Handle Exceptional Conditions
CVE:
Remote: Yes
Local: No
Published: Mar 07 2006 12:00AM
Updated: Mar 13 2006 05:50PM
Credit: Discovery of this vulnerability is credited to Pablo Fernandez.
Vulnerable: Dropbear SSH Server 0.47
Dropbear SSH Server 0.46
Dropbear SSH Server 0.45
+ Debian Linux 3.1 sparc
 + Debian Linux 3.1 s/390
 + Debian Linux 3.1 ppc
 + Debian Linux 3.1 mipsel
 + Debian Linux 3.1 mips
 + Debian Linux 3.1 m68k
 + Debian Linux 3.1 ia-64
 + Debian Linux 3.1 ia-32
 + Debian Linux 3.1 hppa
 + Debian Linux 3.1 arm
 + Debian Linux 3.1 amd64
 + Debian Linux 3.1 alpha
 + Debian Linux 3.1
Dropbear SSH Server 0.44
Dropbear SSH Server 0.43
Dropbear SSH Server 0.42
Dropbear SSH Server 0.41
Dropbear SSH Server 0.40
Dropbear SSH Server 0.39
Dropbear SSH Server 0.38
Dropbear SSH Server 0.37
Dropbear SSH Server 0.36
Dropbear SSH Server 0.35
Dropbear SSH Server 0.34
Dropbear SSH Server 0.33
Dropbear SSH Server 0.32
Dropbear SSH Server 0.31
Dropbear SSH Server 0.30
Dropbear SSH Server 0.29
Dropbear SSH Server 0.28
Not Vulnerable: Dropbear SSH Server 0.48

Discussion

Dropbear Remote Denial Of Service Vulnerability

Dropbear is prone to a remote denial-of-service vulnerability.

A remote attacker may exploit this issue by maintaining 30 simultaneous connections to the server.
This will allow the attacker to deny service to all legitimate users and prevent the administrative user from connecting to or restarting the server.

Exploit / POC

Dropbear Remote Denial Of Service Vulnerability

This issue can be trivially exploited by creating 30 connections to the server.

Solution / Fix

Dropbear Remote Denial Of Service Vulnerability

Solution:

Currently we are not aware of any vendor-supplied patches for this issue. If you feel we are in error or are aware of more recent information, please mail us at: [email protected]:[email protected]

The vendor has released version 0.48 to address this issue.


Dropbear SSH Server 0.28

Dropbear SSH Server 0.29

Dropbear SSH Server 0.30

Dropbear SSH Server 0.31

Dropbear SSH Server 0.32

Dropbear SSH Server 0.33

Dropbear SSH Server 0.34

Dropbear SSH Server 0.35

Dropbear SSH Server 0.36

Dropbear SSH Server 0.37

Dropbear SSH Server 0.38

Dropbear SSH Server 0.39

Dropbear SSH Server 0.40

Dropbear SSH Server 0.41

Dropbear SSH Server 0.42

Dropbear SSH Server 0.43

Dropbear SSH Server 0.44

Dropbear SSH Server 0.45

Dropbear SSH Server 0.46

Dropbear SSH Server 0.47

References

Dropbear Remote Denial Of Service Vulnerability

References:
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