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Sid 1-48265

Message

PROTOCOL-VOIP SIP wildcard VIA address flood attempt

Summary

This event is generated when a SIP wildcard VIA address flood attacks an internal VOIP device.

Impact

Attempted Denial of Service

CVE-2018-15454:

CVSS base score 8.6

CVSS impact score 4.0

CVSS exploitability score 3.9

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Detailed information

A vulnerability in the Session Initiation Protocol (SIP) inspection engine of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause an affected device to reload or trigger high CPU, resulting in a denial of service (DoS) condition.

The vulnerability is due to improper handling of SIP traffic. An attacker could exploit this vulnerability by sending SIP requests designed to specifically trigger this issue at a high rate across an affected device. CVE-2018-15454: A vulnerability in the Session Initiation Protocol (SIP) inspection engine of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause an affected device to reload or trigger high CPU, resulting in a denial of service (DoS) condition. The vulnerability is due to improper handling of SIP traffic. An attacker could exploit this vulnerability by sending SIP requests designed to specifically trigger this issue at a high rate across an affected device. Software updates that address this vulnerability are not yet available.

Affected systems

  • cisco adaptivesecurityappliance_software 9.4(1)
  • cisco adaptivesecurityappliance_software 9.4(1.1)
  • cisco adaptivesecurityappliance_software 9.4(3)
  • cisco adaptivesecurityappliance_software 9.4(4)2
  • cisco adaptivesecurityappliance_software 9.4(4)5
  • cisco adaptivesecurityappliance_software 9.4(4)6
  • cisco adaptivesecurityappliance_software 9.4(4)8
  • cisco adaptivesecurityappliance_software 9.4(4)10
  • cisco adaptivesecurityappliance_software 9.4(4)12
  • cisco adaptivesecurityappliance_software 9.4(4)13
  • cisco adaptivesecurityappliance_software 9.4(4)14
  • cisco adaptivesecurityappliance_software 9.4(4)16
  • cisco adaptivesecurityappliance_software 9.4(4)17
  • cisco adaptivesecurityappliance_software 9.4(4)18
  • cisco adaptivesecurityappliance_software 9.4.1
  • cisco adaptivesecurityappliance_software 9.4.1.1
  • cisco adaptivesecurityappliance_software 9.4.1.2
  • cisco adaptivesecurityappliance_software 9.4.1.3
  • cisco adaptivesecurityappliance_software 9.4.1.5
  • cisco adaptivesecurityappliance_software 9.4.2
  • cisco adaptivesecurityappliance_software 9.4.2.3
  • cisco adaptivesecurityappliance_software 9.4.3
  • cisco adaptivesecurityappliance_software 9.4.3.4
  • cisco adaptivesecurityappliance_software 9.4.3.6
  • cisco adaptivesecurityappliance_software 9.4.3.8
  • cisco adaptivesecurityappliance_software 9.4.3.11
  • cisco adaptivesecurityappliance_software 9.4.3.12
  • cisco adaptivesecurityappliance_software 9.4.4
  • cisco adaptivesecurityappliance_software 9.6
  • cisco adaptivesecurityappliance_software 9.6(1)
  • cisco adaptivesecurityappliance_software 9.6(2)
  • cisco adaptivesecurityappliance_software 9.6(3)3
  • cisco adaptivesecurityappliance_software 9.6(3)8
  • cisco adaptivesecurityappliance_software 9.6(3)9
  • cisco adaptivesecurityappliance_software 9.6(3)11
  • cisco adaptivesecurityappliance_software 9.6(3)12
  • cisco adaptivesecurityappliance_software 9.6(3)14
  • cisco adaptivesecurityappliance_software 9.6(3)17
  • cisco adaptivesecurityappliance_software 9.6(3.1)
  • cisco adaptivesecurityappliance_software 9.6(4)
  • cisco adaptivesecurityappliance_software 9.6(4)3
  • cisco adaptivesecurityappliance_software 9.6(4)5
  • cisco adaptivesecurityappliance_software 9.6(4)6
  • cisco adaptivesecurityappliance_software 9.6(4)8
  • cisco adaptivesecurityappliance_software 9.6.0
  • cisco adaptivesecurityappliance_software 9.6.1
  • cisco adaptivesecurityappliance_software 9.6.1.3
  • cisco adaptivesecurityappliance_software 9.6.1.5
  • cisco adaptivesecurityappliance_software 9.6.1.10
  • cisco adaptivesecurityappliance_software 9.6.2
  • cisco adaptivesecurityappliance_software 9.6.2.1
  • cisco adaptivesecurityappliance_software 9.6.2.2
  • cisco adaptivesecurityappliance_software 9.6.2.3
  • cisco adaptivesecurityappliance_software 9.6.2.7
  • cisco adaptivesecurityappliance_software 9.8
  • cisco adaptivesecurityappliance_software 9.8(0.56)
  • cisco adaptivesecurityappliance_software 9.8(1)
  • cisco adaptivesecurityappliance_software 9.8(1.200)
  • cisco adaptivesecurityappliance_software 9.8(2)
  • cisco adaptivesecurityappliance_software 9.8(2)8
  • cisco adaptivesecurityappliance_software 9.8(2)14
  • cisco adaptivesecurityappliance_software 9.8(2)17
  • cisco adaptivesecurityappliance_software 9.8(2)20
  • cisco adaptivesecurityappliance_software 9.8(2)24
  • cisco adaptivesecurityappliance_software 9.8(2)26
  • cisco adaptivesecurityappliance_software 9.8(2)28
  • cisco adaptivesecurityappliance_software 9.8(3)
  • cisco adaptivesecurityappliance_software 9.9
  • cisco adaptivesecurityappliance_software 9.9(1)
  • cisco adaptivesecurityappliance_software 9.9(2)
  • cisco adaptivesecurityappliance_software 9.9(2)1
  • cisco firepowerthreatdefense 6.1.0
  • cisco firepowerthreatdefense 6.2.0.1
  • cisco firepowerthreatdefense 6.2.0.3
  • cisco firepowerthreatdefense 6.2.0.4
  • cisco firepowerthreatdefense 6.2.2.2
  • cisco firepowerthreatdefense 6.2.2.3
  • cisco firepowerthreatdefense 6.2.3.1

Ease of attack

CVE-2018-15454:

Access Vector

Access Complexity

Authentication

False positives

None Known

False negatives

None Known

Corrective action

tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20181031-asaftd-sip-dos

Contributors

  • Cisco's Talos Intelligence Group

Additional References

  • tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20181031-asaftd-sip-dos