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Asterisk SIP Channel Driver Denial Of Service Vulnerability (Linux)

Information

Severity

Severity

High

Family

Family

Denial of Service

CVSSv2 Base

CVSSv2 Base

7.8

CVSSv2 Vector

CVSSv2 Vector

AV:N/AC:L/Au:N/C:N/I:N/A:C

Solution Type

Solution Type

Vendor Patch

Created

Created

12 years ago

Modified

Modified

3 years ago

Summary

This host has Asterisk installed and is prone to Denial of Service vulnerability.

Insight

Insight

The flaw is due to an error in SIP channel driver which fails to use maximum width when invoking 'sscanf' style functions. This can be exploited via SIP packets containing large sequences of ASCII decimal characters as demonstrated via vectors related to the CSeq value in a SIP header, large Content-Length value and SDP.

Affected Software

Affected Software

Asterisk version 1.2.x before 1.2.34, 1.4.x before 1.4.26.1, 1.6.0.x before 1.6.0.12, and 1.6.1.x before 1.6.1.4 on Linux.

Solution

Solution

Upgrade to version 1.2.34, 1.4.26.1, 1.6.0.12, 1.6.1.4 or later.

Common Vulnerabilities and Exposures (CVE)