59697 : Asterisk SIP REGISTER Response Username Enumeration Weakness
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Views This Week	Views All Time	Added to OSVDB	Last Modified	Modified (since 2008)	Percent Complete
8	1049	over 3 years ago	over 3 years ago	3 times	90%

Timeline

Disclosure Date
2009-11-04

Description

Asterisk contains a flaw that may allow an attacker to determine valid usernames. The issue is triggered when different responses are being sent using a valid or an invalid username in 'REGISTER' messages. This can be exploited to determine valid usernames by sending a specially crafted 'REGISTER' message. .

Classification

Location: Remote / Network Access
Attack Type: Information Disclosure
Impact: Loss of Confidentiality
Solution: Patch / RCS, Upgrade
Disclosure: Vendor Verified

Solution

Upgrade to version 1.2.35, 1.4.26.3, 1.6.0.17, 1.6.19 or higher, as it has been reported to fix this vulnerability. In addition, Digium has released a patch for some older versions.

Products

Digium, Inc.	Asterisk	1.2.x
		1.2.35 (not affected)
		1.4.x
		1.4.26.3 (not affected)
		1.6.0.x
		1.6.0.17 (not affected)
		1.6.1.x
		1.6.1.9 (not affected)

References

Security Tracker: 1023133
CVE ID: 2009-3727 (see also: NVD)
Bugtraq ID: 36924
Secunia Advisory ID: 37265 37479 37677 40039
Vendor Specific News/Changelog Entry: http://downloads.asterisk.org/pub/security/AST-2009-008.html
https://www.redhat.com/archives/fedora-package-announce/2009-November/msg00789.html
https://www.redhat.com/archives/fedora-package-announce/2009-November/msg00838.html
Vendor Specific Advisory URL: http://www.debian.org/security/2009/dsa-1952
http://www.gentoo.org/security/en/glsa/glsa-201006-20.xml

Credit

Patrik Karlsson - patrikcqure.net - cqure.net

CVSSv2 Score

CVSSv2 Base Score = 5.0
Source: nvd.nist.gov | Generated: 2009-11-11 | Disagree?

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