Asterisk SIP Authentication Request User Enumeration Weakness

BID:48485

Info

Asterisk SIP Authentication Request User Enumeration Weakness

Bugtraq ID: 48485
Class: Design Error
CVE: CVE-2011-2536
Remote: Yes
Local: No
Published: Jun 28 2011 12:00AM
Updated: Oct 24 2011 08:22PM
Credit: The vendor has reported this issue.
Vulnerable: Gentoo Linux
Asterisk Asterisk Business Edition C.3.6.4
Asterisk Asterisk Business Edition C.3.6.3
Asterisk Asterisk Business Edition C.3.6.2
Asterisk Asterisk Business Edition C.3.3.2
Asterisk Asterisk Business Edition C.3.2 3
Asterisk Asterisk Business Edition C.3.2 2
Asterisk Asterisk Business Edition C.3.1.0
Asterisk Asterisk Business Edition C.3.1 1
Asterisk Asterisk 1.8.4 2
Asterisk Asterisk 1.8.4 1
Asterisk Asterisk 1.8.2 4
Asterisk Asterisk 1.8.1
Asterisk Asterisk 1.8
Asterisk Asterisk 1.6.2 16.2
Asterisk Asterisk 1.6.2 .5
Asterisk Asterisk 1.6.2
Asterisk Asterisk 1.4.39 2
Asterisk Asterisk 1.4.27 1
Asterisk Asterisk 1.4.26 .3
Asterisk Asterisk 1.4.26
Asterisk Asterisk 1.4.24 .1
Asterisk Asterisk 1.4.24
Asterisk Asterisk 1.4.23 .1
Asterisk Asterisk 1.4.23
Asterisk Asterisk 1.4.22
Asterisk Asterisk 1.4.19 .1
Asterisk Asterisk 1.4.19
Asterisk Asterisk 1.4.18
Asterisk Asterisk 1.4.17
Asterisk Asterisk 1.4.16
Asterisk Asterisk 1.4.15
Asterisk Asterisk 1.4.14
Asterisk Asterisk 1.4.13
Asterisk Asterisk 1.4.12
Asterisk Asterisk 1.4.11
Asterisk Asterisk 1.4.10
Asterisk Asterisk 1.4.4
Asterisk Asterisk 1.4.3
Asterisk Asterisk 1.4.2
Asterisk Asterisk 1.4.1
Asterisk Asterisk 1.8.4.3
Asterisk Asterisk 1.8.3.3
Asterisk Asterisk 1.8.3.1
Asterisk Asterisk 1.8.2.1
Asterisk Asterisk 1.8.1.2
Asterisk Asterisk 1.8
Asterisk Asterisk 1.6.2.2
Asterisk Asterisk 1.6.2.18.1
Asterisk Asterisk 1.6.2.17.3
Asterisk Asterisk 1.6.2.17.1
Asterisk Asterisk 1.6.2.16.1
Asterisk Asterisk 1.6.2.15.1
Asterisk Asterisk 1.4.41.1
Asterisk Asterisk 1.4.39.1
Asterisk Asterisk 1.4.38.1
Asterisk Asterisk 1.4.26.2
Asterisk Asterisk 1.4.26.1
Asterisk Asterisk 1.4.22.1
Asterisk Asterisk 1.4.21.2
Asterisk Asterisk 1.4.18.1
Asterisk Asterisk 1.4.40.1
Not Vulnerable: Asterisk Asterisk Business Edition C.3.7.3
Asterisk Asterisk 1.8.4.4
Asterisk Asterisk 1.6.2.18.2
Asterisk Asterisk 1.4.41.2

Discussion

Asterisk SIP Authentication Request User Enumeration Weakness

Asterisk is prone to a user-enumeration weakness.

An attacker may leverage this issue to harvest valid usernames, which may aid in brute-force attacks.

This issue is fixed in the following versions:

Asterisk 1.4.41.2, 1.6.2.18.2, and 1.8.4.4
Asterisk Business Edition C.3.7.3

Exploit / POC

Asterisk SIP Authentication Request User Enumeration Weakness

An attacker can exploit this issue using readily available tools.

Solution / Fix

Asterisk SIP Authentication Request User Enumeration Weakness

Solution:
Updates are available. Please see the references for more information.

References

Asterisk SIP Authentication Request User Enumeration Weakness

References:

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