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This vulnerability has been modified since it was last analyzed by the NVD. It is awaiting reanalysis which may result in further changes to the information provided.
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.
Source: MITRE Description Last Modified: 12/12/2016 View Analysis Description
Source: MITRE Description Last Modified: 12/12/2016
Base Score: 5.3 MEDIUM Vector: AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N (V3 legend) Impact Score: 1.4 Exploitability Score: 3.9
Attack Vector (AV): Network Attack Complexity (AC): Low Privileges Required (PR): None User Interaction (UI): None Scope (S): Unchanged Confidentiality (C): None Integrity (I): Low Availability (A): None
Base Score: 5.0 MEDIUM Vector: (AV:N/AC:L/Au:N/C:N/I:P/A:N) (V2 legend) Impact Subscore: 2.9 Exploitability Subscore: 10.0
Access Vector (AV): Network Access Complexity (AC): Insufficient_Info Authentication (AU): None Confidentiality (C): None Integrity (I): Partial Availability (A): None Additional Information: Allows unauthorized modification
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Vulnerability Type (View All)
http://www.securitytracker.com/id/1037408 [No Types Assigned]
OR *cpe:2.3:a:digium:certified_asterisk:11.0.0:*:*:*:*:*:*:* *cpe:2.3:a:digium:certified_asterisk:11.0.0:rc1:*:*:*:*:*:* *cpe:2.3:a:digium:certified_asterisk:11.0.0:rc2:*:*:*:*:*:* *cpe:2.3:a:digium:certified_asterisk:11.1.0:*:*:*:*:*:*:* *cpe:2.3:a:digium:certified_asterisk:11.1.0:rc1:*:*:*:*:*:* *cpe:2.3:a:digium:certified_asterisk:11.1.0:rc2:*:*:*:*:*:* *cpe:2.3:a:digium:certified_asterisk:11.1.0:rc3:*:*:*:*:*:* *cpe:2.3:a:digium:certified_asterisk:11.2
OR *cpe:2.3:a:asterisk:open_source:11.0.0:*:*:*:*:*:*:* *cpe:2.3:a:asterisk:open_source:11.0.0:beta1:*:*:*:*:*:* *cpe:2.3:a:asterisk:open_source:11.0.0:beta2:*:*:*:*:*:* *cpe:2.3:a:asterisk:open_source:11.0.0:rc1:*:*:*:*:*:* *cpe:2.3:a:asterisk:open_source:11.0.0:rc2:*:*:*:*:*:* *cpe:2.3:a:asterisk:open_source:11.0.1:*:*:*:*:*:*:* *cpe:2.3:a:asterisk:open_source:11.0.2:*:*:*:*:*:*:* *cpe:2.3:a:asterisk:open_source:11.1.0:*:*:*:*:*:*:* *cpe:2.3:a:aster
OR *cpe:2.3:a:digium:asterisk:11.0.0:*:*:*:*:*:*:* *cpe:2.3:a:digium:asterisk:11.0.0:beta1:*:*:*:*:*:* *cpe:2.3:a:digium:asterisk:11.0.0:beta2:*:*:*:*:*:* *cpe:2.3:a:digium:asterisk:11.0.0:rc1:*:*:*:*:*:* *cpe:2.3:a:digium:asterisk:11.0.0:rc2:*:*:*:*:*:* *cpe:2.3:a:digium:asterisk:11.0.1:*:*:*:*:*:*:* *cpe:2.3:a:digium:asterisk:11.0.2:*:*:*:*:*:*:* *cpe:2.3:a:digium:asterisk:11.1.0:*:*:*:*:*:*:* *cpe:2.3:a:digium:asterisk:11.1.0:rc1:*:*:*:*:*:* *
(AV:N/AC:L/Au:N/C:N/I:P/A:N)
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
CWE-285
http://downloads.asterisk.org/pub/security/AST-2016-009.html No Types Assigned
http://downloads.asterisk.org/pub/security/AST-2016-009.html Mitigation, Vendor Advisory
http://www.securityfocus.com/bid/94789 No Types Assigned
http://www.securityfocus.com/bid/94789 Third Party Advisory, VDB Entry
http://www.securityfocus.com/bid/94789 [No Types Assigned]