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CVE
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CVE-2016-9938

Date: (C)2016-12-14   (M)2017-12-06 


An issue was discovered in Asterisk Open Source 11.x before 11.25.1, 13.x before 13.13.1, and 14.x before 14.2.1 and Certified Asterisk 11.x before 11.6-cert16 and 13.x before 13.8-cert4. The chan_sip channel driver has a liberal definition for whitespace when attempting to strip the content between a SIP header name and a colon character. Rather than following RFC 3261 and stripping only spaces and horizontal tabs, Asterisk treats any non-printable ASCII character as if it were whitespace. This means that headers such as Contact\x01: will be seen as a valid Contact header. This mostly does not pose a problem until Asterisk is placed in tandem with an authenticating SIP proxy. In such a case, a crafty combination of valid and invalid To headers can cause a proxy to allow an INVITE request into Asterisk without authentication since it believes the request is an in-dialog request. However, because of the bug described above, the request will look like an out-of-dialog request to Asterisk. Asterisk will then process the request as a new call. The result is that Asterisk can process calls from unvetted sources without any authentication. If you do not use a proxy for authentication, then this issue does not affect you. If your proxy is dialog-aware (meaning that the proxy keeps track of what dialogs are currently valid), then this issue does not affect you. If you use chan_pjsip instead of chan_sip, then this issue does not affect you.

CVSS Score: 5.0Access Vector: NETWORK
Exploit Score: 10.0Access Complexity: LOW
Impact Score: 2.9Authentication: NONE
 Confidentiality: NONE
 Integrity: PARTIAL
 Availability: NONE





Reference:
SECTRACK-1037408
BID-94789
http://downloads.asterisk.org/pub/security/AST-2016-009.html

CPE    121
cpe:/a:digium:asterisk:11.2.0:rc1
cpe:/a:digium:certified_asterisk:11.6:cert3
cpe:/a:digium:certified_asterisk:11.6:cert2
cpe:/a:digium:certified_asterisk:11.6:cert1
...
CWE    1
CWE-285

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