Asterisk Dial() weak security

asterisk-dial-weak-security (56397) The risk level is classified as MediumMedium Risk

Description:

Asterisk could provide weaker than expected security, caused by an error when the ${EXTEN} channel variable in a dialplan is used with wildcard patterns. A remote attacker could exploit this vulnerability using a specially-crafted SIP INVITE message to create an additional outgoing channel leg that was not originally intentioned by the dialplan programmer.

*CVSS:

Base Score: 5
  Access Vector: Network
  Access Complexity: Low
  Authentication: None
  Confidentiality Impact: None
  Integrity Impact: Partial
  Availability Impact: None
 
Temporal Score: 3.7
  Exploitability: Unproven
  Remediation Level: Official-Fix
  Report Confidence: Confirmed

Consequences:

Bypass Security

Remedy:

Refer to AST-2010-002 for patch, upgrade or suggested workaround information. See References.

References:

  • AST-2010-002: Asterisk Dialplan injection vulnerability.
  • BID-38314: Asterisk Dialplan '${EXTEN}' Variable String Injection Vulnerability
  • CVE-2010-0685: The design of the dialplan functionality in Asterisk Open Source 1.2.x, 1.4.x, and 1.6.x; and Asterisk Business Edition B.x.x and C.x.x, when using the ${EXTEN} channel variable and wildcard pattern matches, allows context-dependent attackers to inject strings into the dialplan using metacharacters that are injected when the variable is expanded, as demonstrated using the Dial application to process a crafted SIP INVITE message that adds an unintended outgoing channel leg. NOTE: it could be argued that this is not a vulnerability in Asterisk, but a class of vulnerabilities that can occur in any program that uses this feature without the associated filtering functionality that is already available.
  • OSVDB ID: 62451: Asterisk Dialplan Wildcard Pattern Configuration Manipulation
  • SA38641: Asterisk Dialplan Wildcard Pattern Weakness
  • SECTRACK ID: 1023637: Asterisk Scripting Support Lets Remote Users Inject Data into Dialplans

Platforms Affected:

  • 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.2.5.0
  • 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
  • Digium Asterisk Business Edition C.1.8.0
  • Digium Asterisk Business Edition C.1.8.1
  • Digium Asterisk Business Edition C.2.3
  • Digium Asterisk Business Edition C.3
  • Digium Asterisk Open Source 1.2
  • Digium Asterisk Open Source 1.2.0
  • Digium Asterisk Open Source 1.2.0 rc1
  • Digium Asterisk Open Source 1.2.0 Beta1
  • Digium Asterisk Open Source 1.2.0 rc2
  • Digium Asterisk Open Source 1.2.0 Beta2
  • Digium Asterisk Open Source 1.2.1
  • Digium Asterisk Open Source 1.2.10
  • Digium Asterisk Open Source 1.2.10 Netsec
  • Digium Asterisk Open Source 1.2.11 Netsec
  • Digium Asterisk Open Source 1.2.11
  • Digium Asterisk Open Source 1.2.12
  • Digium Asterisk Open Source 1.2.12 Netsec
  • Digium Asterisk Open Source 1.2.12.1
  • Digium Asterisk Open Source 1.2.12.1 Netsec
  • Digium Asterisk Open Source 1.2.13
  • Digium Asterisk Open Source 1.2.13 Netsec
  • Digium Asterisk Open Source 1.2.14
  • Digium Asterisk Open Source 1.2.14 Netsec
  • Digium Asterisk Open Source 1.2.15
  • Digium Asterisk Open Source 1.2.15 Netsec
  • Digium Asterisk Open Source 1.2.16 Netsec
  • Digium Asterisk Open Source 1.2.16
  • Digium Asterisk Open Source 1.2.17 Netsec
  • Digium Asterisk Open Source 1.2.17
  • Digium Asterisk Open Source 1.2.18
  • Digium Asterisk Open Source 1.2.18 Netsec
  • Digium Asterisk Open Source 1.2.19 Netsec
  • Digium Asterisk Open Source 1.2.19
  • Digium Asterisk Open Source 1.2.2 Netsec
  • Digium Asterisk Open Source 1.2.2
  • Digium Asterisk Open Source 1.2.20 Netsec
  • Digium Asterisk Open Source 1.2.20
  • Digium Asterisk Open Source 1.2.21
  • Digium Asterisk Open Source 1.2.21 Netsec
  • Digium Asterisk Open Source 1.2.21.1 Netsec
  • Digium Asterisk Open Source 1.2.21.1
  • Digium Asterisk Open Source 1.2.22 Netsec
  • Digium Asterisk Open Source 1.2.22
  • Digium Asterisk Open Source 1.2.23 Netsec
  • Digium Asterisk Open Source 1.2.23
  • Digium Asterisk Open Source 1.2.24
  • Digium Asterisk Open Source 1.2.24 Netsec
  • Digium Asterisk Open Source 1.2.25 Netsec
  • Digium Asterisk Open Source 1.2.25
  • Digium Asterisk Open Source 1.2.26 Netsec
  • Digium Asterisk Open Source 1.2.26
  • Digium Asterisk Open Source 1.2.26.1 Netsec
  • Digium Asterisk Open Source 1.2.26.1
  • Digium Asterisk Open Source 1.2.26.2
  • Digium Asterisk Open Source 1.2.26.2 Netsec
  • Digium Asterisk Open Source 1.2.27
  • Digium Asterisk Open Source 1.2.28
  • Digium Asterisk Open Source 1.2.28.1
  • Digium Asterisk Open Source 1.2.29
  • Digium Asterisk Open Source 1.2.3
  • Digium Asterisk Open Source 1.2.3 Netsec
  • Digium Asterisk Open Source 1.2.30
  • Digium Asterisk Open Source 1.2.30.2
  • Digium Asterisk Open Source 1.2.30.3
  • Digium Asterisk Open Source 1.2.30.4
  • Digium Asterisk Open Source 1.2.31
  • Digium Asterisk Open Source 1.2.32
  • Digium Asterisk Open Source 1.2.33
  • Digium Asterisk Open Source 1.2.34
  • Digium Asterisk Open Source 1.2.4
  • Digium Asterisk Open Source 1.2.4 Netsec
  • Digium Asterisk Open Source 1.2.5
  • Digium Asterisk Open Source 1.2.5 Netsec
  • Digium Asterisk Open Source 1.2.6 Netsec
  • Digium Asterisk Open Source 1.2.6
  • Digium Asterisk Open Source 1.2.7
  • Digium Asterisk Open Source 1.2.7 Netsec
  • Digium Asterisk Open Source 1.2.7.1 Netsec
  • Digium Asterisk Open Source 1.2.7.1
  • Digium Asterisk Open Source 1.2.8 Netsec
  • Digium Asterisk Open Source 1.2.8
  • Digium Asterisk Open Source 1.2.9
  • Digium Asterisk Open Source 1.2.9.1
  • Digium Asterisk Open Source 1.2.9.1 Netsec
  • Digium Asterisk Open Source 1.4
  • Digium Asterisk Open Source 1.4 Beta
  • Digium Asterisk Open Source 1.4.0 Beta4
  • Digium Asterisk Open Source 1.4.0 Beta3
  • Digium Asterisk Open Source 1.4.0 Beta2
  • Digium Asterisk Open Source 1.4.0
  • Digium Asterisk Open Source 1.4.1
  • Digium Asterisk Open Source 1.4.10
  • Digium Asterisk Open Source 1.4.10.1
  • Digium Asterisk Open Source 1.4.11
  • Digium Asterisk Open Source 1.4.12
  • Digium Asterisk Open Source 1.4.12.1
  • 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 1.4.16.1
  • Digium Asterisk Open Source 1.4.16.2
  • 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 rc1
  • Digium Asterisk Open Source 1.4.19 rc2
  • Digium Asterisk Open Source 1.4.19
  • Digium Asterisk Open Source 1.4.19 rc4
  • Digium Asterisk Open Source 1.4.19 RC-2
  • Digium Asterisk Open Source 1.4.19 rc3
  • Digium Asterisk Open Source 1.4.19.1
  • Digium Asterisk Open Source 1.4.19.2
  • Digium Asterisk Open Source 1.4.2
  • Digium Asterisk Open Source 1.4.20 rc1
  • Digium Asterisk Open Source 1.4.20 rc2
  • Digium Asterisk Open Source 1.4.20 rc3
  • Digium Asterisk Open Source 1.4.20
  • Digium Asterisk Open Source 1.4.21 rc2
  • Digium Asterisk Open Source 1.4.21 rc1
  • Digium Asterisk Open Source 1.4.21
  • Digium Asterisk Open Source 1.4.21.1
  • Digium Asterisk Open Source 1.4.21.2
  • Digium Asterisk Open Source 1.4.22 rc3
  • Digium Asterisk Open Source 1.4.22
  • Digium Asterisk Open Source 1.4.22 rc4
  • Digium Asterisk Open Source 1.4.22.1
  • Digium Asterisk Open Source 1.4.22.2
  • Digium Asterisk Open Source 1.4.23 rc3
  • Digium Asterisk Open Source 1.4.23
  • Digium Asterisk Open Source 1.4.23 rc1
  • Digium Asterisk Open Source 1.4.23 rc2
  • Digium Asterisk Open Source 1.4.23.1
  • Digium Asterisk Open Source 1.4.24
  • Digium Asterisk Open Source 1.4.25
  • Digium Asterisk Open Source 1.4.26
  • Digium Asterisk Open Source 1.4.26.1
  • Digium Asterisk Open Source 1.4.26.2
  • Digium Asterisk Open Source 1.4.3
  • Digium Asterisk Open Source 1.4.4
  • Digium Asterisk Open Source 1.4.4_2007-04-27
  • 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 1.4.7.1
  • 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

Reported:

Feb 16, 2010

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