National Vulnerability Database

National Vulnerability Database

National Vulnerability
Database

CVE-2016-9938 Detail

Current Description

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
View Analysis Description

Impact

CVSS v3.0 Severity and Metrics:

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

CVSS v2.0 Severity and Metrics:

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

References to Advisories, Solutions, and Tools

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Hyperlink Resource
http://downloads.asterisk.org/pub/security/AST-2016-009.html Mitigation Vendor Advisory
http://www.securityfocus.com/bid/94789 Third Party Advisory VDB Entry
http://www.securitytracker.com/id/1037408

Technical Details

Vulnerability Type (View All)

Known Affected Software Configurations Switch to CPE 2.2

Configuration 1 ( hide )
 cpe:2.3:a:digium:asterisk:11.0.0:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:11.0.0:beta1:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:11.0.0:beta2:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:11.0.0:rc1:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:11.0.0:rc2:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:11.0.1:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:11.0.2:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:11.1.0:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:11.1.0:rc1:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:11.1.0:rc3:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:11.1.1:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:11.1.2:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:11.2.0:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:11.2.0:rc1:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:11.2.0:rc2:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:11.2.1:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:11.2.2:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:11.3.0:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:11.4.0:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:11.5.0:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:11.5.1:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:11.6.0:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:11.6.1:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:11.7.0:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:11.8.0:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:11.8.1:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:11.9.0:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:11.10.0:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:11.10.1:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:11.10.2:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:11.11.0:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:11.12.0:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:11.12.1:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:11.13.0:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:11.13.1:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:11.14.0:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:11.14.1:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:11.14.2:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:11.15.0:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:11.15.1:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:11.16.0:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:11.17.0:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:11.17.1:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:11.18.0:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:11.19.0:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:11.20.0:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:11.21.0:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:11.21.1:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:11.21.2:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:11.22.0:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:11.22.0:rc1:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:11.23.0:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:11.23.0:rc1:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:11.23.1:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:11.24.0:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:11.24.1:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:11.25.0:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:13.0.0:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:13.0.0:beta1:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:13.0.0:beta2:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:13.0.0:beta3:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:13.0.1:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:13.0.2:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:13.1.0:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:13.1.1:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:13.2.0:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:13.2.1:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:13.3.0:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:13.3.1:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:13.3.2:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:13.4.0:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:13.5.0:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:13.6.0:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:13.7.0:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:13.7.1:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:13.7.2:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:13.8.0:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:13.8.0:rc1:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:13.8.1:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:13.8.2:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:13.9.0:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:13.9.1:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:13.10.0:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:13.10.0:rc1:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:13.11.0:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:13.11.1:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:13.11.2:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:13.12.0:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:13.12.1:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:13.12.2:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:13.13.0:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:14.0.0:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:14.0.0:beta1:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:14.0.0:beta2:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:14.0.0:rc1:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:14.0.0:rc2:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:14.0.1:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:14.0.2:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:14.1.0:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:14.1.1:*:*:*:*:*:*:*
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 cpe:2.3:a:digium:asterisk:14.1.2:*:*:*:*:*:*:*
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Configuration 2 ( hide )

Showing 100 of 146 CPEs, view all CPEs here.

Change History

4 change records found - show changes

Quick Info

CVE Dictionary Entry:
CVE-2016-9938
NVD Published Date:
12/12/2016
NVD Last Modified:
07/26/2017