35369 : Asterisk Manager Interface Passwordless User MD5 Authentication DoS
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Info

Last Modified
about 1 year ago

Percent Complete
100%

Disclosure
Apr 25, 2007

Discovery
Unknown

Dates

Exploit
Apr 25, 2007

Solution
Unknown

Keywords

 "TCP Port 5038"

Description

 A remote overflow exists in multiple Asterisk releases. The Manager Interface fails to properly verify user-supplied input resulting in a NULL pointer dereference. With a specially crafted MD5 login request, an attacker can cause a denial of service resulting in a loss of availability for the application.

Classification

 Location: Remote/Network Access Required
Attack Type: Denial of Service
Impact: Loss of Availability
Exploit: Exploit Available
Disclosure: OSVDB Verified

Technical

 This vulnerability is only present when the Asterisk Manager Interface is enabled (not by default) and a user exists in 'manager.conf' without a password/secret assigned to it.

Solution

 Upgrade to Asterisk 1.2.18 or 1.4.3, Asterisk Business Edition B.1.3.3, AsteriskNOW Beta6 and Asterisk Appliance Developer Kit 0.4.0 or higher, as they have been reported to fix this vulnerability. An upgrade is required as there are no known workarounds.

Products
Digium
Watch-list
Asterisk
Watch-list
 1.2.0
1.2.1
1.2.2
1.2.3
1.2.4
1.2.5
1.2.6
1.2.7
1.2.8
1.2.9
1.2.10
1.2.11
1.2.12
1.4.0
1.4.1
1.2.16
1.2.15
1.2.14
1.2.13
1.4.2
1.0.x
1.4.0-beta1
1.4.0-beta2
1.4.0-beta3
1.4.0-beta4
1.2.17
1.2.12.1
1.2.9.1
1.2.7.1
1.2.0-beta1
1.2.0-beta2
1.2.0rc1
1.2.0rc2
Asterisk Appliance Developer Kit
Watch-list
 0.3.2a
0.2.0
AsteriskNOW
Watch-list
 beta5
Asterisk Business Edition
Watch-list
 A.x.x
B.1.3

References

Tools & Filters

Nessus

 25938

Credit
  • Michael Spruel - L.A. Fitness International
  • Jeremy Lee - L.A. Fitness International
  • Peter Nguyen - L.A. Fitness International

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