Executive Summary

Informations
Name CVE-2016-9938 First vendor Publication 2016-12-12
Vendor Cve Last vendor Modification 2017-07-27

Security-Database Scoring CVSS v3

Cvss vector : CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Overall CVSS Score 5.3
Base Score 5.3 Environmental Score 5.3
impact SubScore 1.4 Temporal Score 5.3
Exploitabality Sub Score 3.9
 
Attack Vector Network Attack Complexity Low
Privileges Required None User Interaction None
Scope Unchanged Confidentiality Impact None
Integrity Impact Low Availability Impact None
Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector : (AV:N/AC:L/Au:N/C:N/I:P/A:N)
Cvss Base Score 5 Attack Range Network
Cvss Impact Score 2.9 Attack Complexity Low
Cvss Expoit Score 10 Authentication None Required
Calculate full CVSS 2.0 Vectors scores

Detail

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.

Original Source

Url : http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-9938

CWE : Common Weakness Enumeration

% Id Name
100 % CWE-285 Improper Access Control (Authorization)

CPE : Common Platform Enumeration

TypeDescriptionCount
Application 102
Application 44

Nessus® Vulnerability Scanner

Date Description
2016-12-19 Name : A telephony application running on the remote host is affected by an authenti...
File : asterisk_ast_2016_009.nasl - Type : ACT_GATHER_INFO

Sources (Detail)

Source Url
BID http://www.securityfocus.com/bid/94789
CONFIRM http://downloads.asterisk.org/pub/security/AST-2016-009.html
SECTRACK http://www.securitytracker.com/id/1037408

Alert History

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Date Informations
2020-05-23 00:54:06
  • Multiple Updates
2017-07-27 09:22:59
  • Multiple Updates
2017-01-04 00:21:07
  • Multiple Updates
2016-12-22 21:23:19
  • Multiple Updates
2016-12-20 13:23:28
  • Multiple Updates
2016-12-16 09:23:27
  • Multiple Updates
2016-12-13 05:23:21
  • First insertion