Asterisk NEW message denial of service

asterisk-new-dos (42049) The risk level is classified as MediumMedium Risk

Description:

Asterisk is vulnerable to a denial of service, caused by the improper verification of NEW responses during IAX2 handshakes by the IAX2 channel driver. By sending a spoofed NEW message, a remote attacker could cause the system to release early audio packets to the targeted address and cause a denial of service.

*CVSS:

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

Consequences:

Denial of Service

Remedy:

Refer to AST-2008-006 for patch, upgrade or suggested workaround information. See References.

References:

  • AST-2008-006: 3-way handshake in IAX2 incomplete.
  • Asterisk Web site: Asterisk :: The Open Source PBX & Telephony Platform .
  • CVE-2008-1923: The IAX2 channel driver (chan_iax2) in Asterisk 1.2 before revision 72630 and 1.4 before revision 65679, when configured to allow unauthenticated calls, sends early audio to an unverified source IP address of a NEW message, which allows remote attackers to cause a denial of service (traffic amplification) via a spoofed NEW message.

Platforms Affected:

  • Digium Asterisk Appliance Developer Kit
  • 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.2.5.0
  • Digium Asterisk Business Edition B.2.5.1
  • Digium Asterisk Business Edition C.1.0 Beta7
  • Digium Asterisk Business Edition C.1.0 Beta8
  • Digium Asterisk Business Edition C.1.6.1
  • Digium Asterisk Business Edition C.1.8.0
  • Digium Asterisk Open Source 1.0
  • Digium Asterisk Open Source 1.0.0
  • Digium Asterisk Open Source 1.0.1
  • Digium Asterisk Open Source 1.0.11
  • Digium Asterisk Open Source 1.0.11.1
  • Digium Asterisk Open Source 1.0.12
  • Digium Asterisk Open Source 1.0.2
  • Digium Asterisk Open Source 1.0.3
  • Digium Asterisk Open Source 1.0.4
  • Digium Asterisk Open Source 1.0.5
  • Digium Asterisk Open Source 1.0.6
  • Digium Asterisk Open Source 1.0.7
  • Digium Asterisk Open Source 1.0.8
  • Digium Asterisk Open Source 1.0.9
  • Digium Asterisk Open Source 1.2.0
  • 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
  • Digium Asterisk Open Source 1.2.11 Netsec
  • 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 1.2.13
  • 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 Netsec
  • Digium Asterisk Open Source 1.2.15
  • Digium Asterisk Open Source 1.2.16
  • Digium Asterisk Open Source 1.2.16 Netsec
  • Digium Asterisk Open Source 1.2.17
  • Digium Asterisk Open Source 1.2.17 Netsec
  • Digium Asterisk Open Source 1.2.18 Netsec
  • Digium Asterisk Open Source 1.2.18
  • Digium Asterisk Open Source 1.2.19 Netsec
  • Digium Asterisk Open Source 1.2.19
  • Digium Asterisk Open Source 1.2.2
  • Digium Asterisk Open Source 1.2.20
  • Digium Asterisk Open Source 1.2.20 Netsec
  • Digium Asterisk Open Source 1.2.21
  • Digium Asterisk Open Source 1.2.21 Netsec
  • Digium Asterisk Open Source 1.2.21.1
  • Digium Asterisk Open Source 1.2.21.1 Netsec
  • 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 Netsec
  • Digium Asterisk Open Source 1.2.24
  • Digium Asterisk Open Source 1.2.25 Netsec
  • Digium Asterisk Open Source 1.2.25
  • Digium Asterisk Open Source 1.2.26
  • Digium Asterisk Open Source 1.2.26 Netsec
  • 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 Netsec
  • Digium Asterisk Open Source 1.2.26.2
  • Digium Asterisk Open Source 1.2.27
  • Digium Asterisk Open Source 1.2.28
  • Digium Asterisk Open Source 1.2.3
  • Digium Asterisk Open Source 1.2.3 Netsec
  • 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
  • Digium Asterisk Open Source 1.2.6 Netsec
  • 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
  • Digium Asterisk Open Source 1.2.8 Netsec
  • Digium Asterisk Open Source 1.2.9
  • Digium Asterisk Open Source 1.2.9.1 Netsec
  • Digium Asterisk Open Source 1.2.9.1
  • Digium Asterisk Open Source 1.4.0 Beta4
  • Digium Asterisk Open Source 1.4.0
  • Digium Asterisk Open Source 1.4.0 Beta2
  • Digium Asterisk Open Source 1.4.0 Beta3
  • 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 rc3
  • Digium Asterisk Open Source 1.4.19 rc4
  • Digium Asterisk Open Source 1.4.19 rc1
  • Digium Asterisk Open Source 1.4.19 rc2
  • Digium Asterisk Open Source 1.4.2
  • 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 1.4.7.1
  • Digium Asterisk Open Source 1.4.8
  • Digium Asterisk Open Source 1.4.9
  • Digium AsteriskNOW 1.0
  • Digium AsteriskNOW 1.0.1
  • Digium AsteriskNOW 1.0.2
  • Digium S800i 1.0
  • Digium S800i 1.0.1
  • Digium S800i 1.0.2
  • Digium S800i 1.0.3
  • Digium S800i 1.0.3.3
  • Digium S800i 1.1.0
  • Digium S800i 1.1.0.1
  • Digium s800i 1.1.0.2

Reported:

Apr 22, 2008

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