Asterisk PBX username information disclosure

asterisk-username-info-disclosure (45059) The risk level is classified as LowLow Risk

Description:

Asterisk PBX could allow a remote attacker to obtain sensitive information. When Digest authentication is used, a different error message is returned depending on whether or not a valid SIP username has been entered during a login attempt. A remote attacker could exploit this vulnerability using brute force techniques to enumerate valid usernames and gain unauthorized access to the system.

*CVSS:

Base Score: 4.3
  Access Vector: Network
  Access Complexity: Medium
  Authentication: None
  Confidentiality Impact: Partial
  Integrity Impact: None
  Availability Impact: None
 
Temporal Score: 3.2
  Exploitability: Unproven
  Remediation Level: Official-Fix
  Report Confidence: Confirmed

Consequences:

Obtain Information

Remedy:

Refer to AST-2009-003 for patch, upgrade or suggested workaround information. See References.

References:

  • AST-2009-003: SIP responses expose valid usernames.
  • Asterisk Web site: Asterisk :: The Open Source PBX & Telephony Platform .
  • Misel Consulting Advisory, September 2, 2008: CVE-2008-3903: Disclosure of SIP username in Asterisk PBX..
  • BID-34353: Asterisk Authentication SIP Response Remote Information Disclosure Vulnerability
  • CVE-2008-3903: Asterisk Open Source 1.2.x before 1.2.32, 1.4.x before 1.4.24.1, and 1.6.0.x before 1.6.0.8; Asterisk Business Edition A.x.x, B.x.x before B.2.5.8, C.1.x.x before C.1.10.5, and C.2.x.x before C.2.3.3; s800i 1.3.x before 1.3.0.2; and Trixbox PBX 2.6.1, when Digest authentication and authalwaysreject are enabled, generates different responses depending on whether a SIP username is valid, which allows remote attackers to enumerate valid usernames.
  • DSA-1952: asterisk -- several vulnerabilities
  • GLSA-200905-01: Asterisk: Multiple vulnerabilities
  • OSVDB ID: 48473: Asterisk PBX Digest Authentication Remote Username Enumeration
  • SA34564: Asterisk SIP Response User Enumeration Weakness

Platforms Affected:

  • Debian Debian Linux 5.0
  • Digium Asterisk Business Edition A
  • Digium Asterisk Business Edition B.1.3.2
  • Digium Asterisk Business Edition B.1.3.3
  • Digium Asterisk Business Edition B.2.2.0
  • Digium Asterisk Business Edition B.2.2.1
  • Digium Asterisk Business Edition B.2.3.1
  • Digium Asterisk Business Edition B.2.3.2
  • Digium Asterisk Business Edition B.2.3.3
  • Digium Asterisk Business Edition B.2.3.4
  • Digium Asterisk Business Edition B.2.3.5
  • Digium Asterisk Business Edition B.2.3.6
  • Digium Asterisk Business Edition B.2.5.1
  • Digium Asterisk Business Edition B.2.5.2
  • Digium Asterisk Business Edition B.2.5.3
  • Digium Asterisk Business Edition B.2.5.4
  • Digium Asterisk Business Edition B.2.5.5
  • Digium Asterisk Business Edition B.2.5.6
  • Digium Asterisk Business Edition C.1.0 Beta7
  • Digium Asterisk Business Edition C.1.0 Beta8
  • Digium Asterisk Business Edition C.1.10.3
  • Digium Asterisk Business Edition C.1.6.0
  • Digium Asterisk Business Edition C.1.6.1
  • Digium Asterisk Business Edition C.1.6.2
  • Digium Asterisk Business Edition C.1.8.1
  • Digium Asterisk Open Source 1.2
  • Digium Asterisk Open Source 1.2.0 Beta2
  • Digium Asterisk Open Source 1.2.0 Beta1
  • Digium Asterisk Open Source 1.2.1
  • Digium Asterisk Open Source 1.2.10
  • Digium Asterisk Open Source 1.2.11
  • Digium Asterisk Open Source 1.2.12
  • Digium Asterisk Open Source 1.2.13
  • Digium Asterisk Open Source 1.2.14
  • Digium Asterisk Open Source 1.2.15
  • Digium Asterisk Open Source 1.2.16
  • Digium Asterisk Open Source 1.2.17
  • Digium Asterisk Open Source 1.2.18
  • Digium Asterisk Open Source 1.2.19
  • Digium Asterisk Open Source 1.2.21
  • Digium Asterisk Open Source 1.2.22
  • Digium Asterisk Open Source 1.2.23
  • Digium Asterisk Open Source 1.2.24
  • Digium Asterisk Open Source 1.2.25
  • Digium Asterisk Open Source 1.2.26
  • Digium Asterisk Open Source 1.2.27
  • Digium Asterisk Open Source 1.2.28
  • Digium Asterisk Open Source 1.2.29
  • Digium Asterisk Open Source 1.2.3
  • Digium Asterisk Open Source 1.2.30
  • Digium Asterisk Open Source 1.2.5
  • Digium Asterisk Open Source 1.2.6
  • Digium Asterisk Open Source 1.2.7
  • Digium Asterisk Open Source 1.2.7.1
  • Digium Asterisk Open Source 1.2.8
  • Digium Asterisk Open Source 1.2.9
  • Digium Asterisk Open Source 1.4 Beta
  • Digium Asterisk Open Source 1.4.1
  • Digium Asterisk Open Source 1.4.10
  • Digium Asterisk Open Source 1.4.11
  • Digium Asterisk Open Source 1.4.12
  • Digium Asterisk Open Source 1.4.13
  • Digium Asterisk Open Source 1.4.14
  • Digium Asterisk Open Source 1.4.15
  • Digium Asterisk Open Source 1.4.16
  • Digium Asterisk Open Source 1.4.17
  • Digium Asterisk Open Source 1.4.18
  • Digium Asterisk Open Source 1.4.18.1
  • Digium Asterisk Open Source 1.4.19
  • Digium Asterisk Open Source 1.4.2
  • Digium Asterisk Open Source 1.4.21.1
  • Digium Asterisk Open Source 1.4.3
  • Digium Asterisk Open Source 1.4.4
  • Digium Asterisk Open Source 1.4.5
  • Digium Asterisk Open Source 1.4.6
  • Digium Asterisk Open Source 1.4.7
  • Digium Asterisk Open Source 1.4.8
  • Digium Asterisk Open Source 1.4.9
  • Digium Asterisk Open Source 1.4_revision_95946
  • Digium Asterisk Open Source 1.6
  • Digium Asterisk Open Source 1.6 beta6
  • Digium Asterisk Open Source 1.6.1.0 rc1
  • Digium Asterisk Open Source 1.6.10 rc2
  • Digium Asterisk Open Source 1.6.3
  • Digium Asterisk Open Source 1.6.6
  • Gentoo Linux
  • Trixbox PBX 2.6.1

Reported:

Sep 02, 2008

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