Vulnerability CVE-2016-9938 - CERT Civis.Net

Vulnerability Name:

CVE-2016-9938 (CCN-119610)

Assigned:

2016-11-11

Published:

2016-11-11

Updated:

2017-07-27

Summary:

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 v3 Severity:

5.3 Medium (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N)
4.6 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:U/RL:O/RC:C)

Exploitability Metrics:	Attack Vector (AV): Network Attack Complexity (AC): Low Privileges Required (PR): None User Interaction (UI): None
Scope:	Scope (S): Unchanged
Impact Metrics:	Confidentiality (C): None Integrity (I): Low Availibility (A): None

5.3 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N)
4.6 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:U/RL:O/RC:C)

Exploitability Metrics:	Attack Vector (AV): Network Attack Complexity (AC): Low Privileges Required (PR): None User Interaction (UI): None
Scope:	Scope (S): Unchanged
Impact Metrics:	Confidentiality (C): None Integrity (I): Low Availibility (A): None

CVSS v2 Severity:

5.0 Medium (CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:P/A:N)

Exploitability Metrics:	Access Vector (AV): Network Access Complexity (AC): Low Authentication (Au): None
Impact Metrics:	Confidentiality (C): None Integrity (I): Partial Availibility (A): None

5.0 Medium (CCN CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:P/A:N)

Exploitability Metrics:	Access Vector (AV): Network Access Complexity (AC): Low Athentication (Au): None
Impact Metrics:	Confidentiality (C): None Integrity (I): Partial Availibility (A): None

Vulnerability Type:

Vulnerability Consequences:

Bypass Security

References:

Source: MITRE
Type: CNA
CVE-2016-9938

Source: CCN
Type: Asterisk Project Security Advisory - AST-2016-009
Authentication Bypass

Source: CONFIRM
Type: Mitigation, Vendor Advisory
http://downloads.asterisk.org/pub/security/AST-2016-009.html

Source: BID
Type: Third Party Advisory, VDB Entry
94789

Source: CCN
Type: BID-94789
Asterisk Open Source and Certified Asterisk 'chan_sip' Driver Authentication Bypass Vulnerability

Source: SECTRACK
Type: UNKNOWN
1037408

Source: XF
Type: UNKNOWN
asterisk-chansip-sec-bypass(119610)

Vulnerable Configuration:

Configuration 1:

cpe:/a:digium:asterisk:11.0.0:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:11.0.0:beta1:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:11.0.0:beta2:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:11.0.0:rc1:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:11.0.0:rc2:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:11.0.1:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:11.0.2:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:11.1.0:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:11.1.0:rc1:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:11.1.0:rc3:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:11.1.1:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:11.1.2:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:11.2.0:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:11.2.0:rc1:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:11.2.0:rc2:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:11.2.1:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:11.2.2:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:11.3.0:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:11.4.0:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:11.5.0:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:11.5.1:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:11.6.0:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:11.6.1:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:11.7.0:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:11.8.0:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:11.8.1:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:11.9.0:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:11.10.0:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:11.10.1:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:11.10.2:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:11.11.0:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:11.12.0:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:11.12.1:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:11.13.0:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:11.13.1:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:11.14.0:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:11.14.1:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:11.14.2:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:11.15.0:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:11.15.1:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:11.16.0:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:11.17.0:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:11.17.1:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:11.18.0:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:11.19.0:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:11.20.0:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:11.21.0:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:11.21.1:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:11.21.2:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:11.22.0:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:11.22.0:rc1:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:11.23.0:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:11.23.0:rc1:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:11.23.1:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:11.24.0:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:11.24.1:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:11.25.0:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:13.0.0:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:13.0.0:beta1:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:13.0.0:beta2:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:13.0.0:beta3:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:13.0.1:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:13.0.2:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:13.1.0:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:13.1.1:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:13.2.0:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:13.2.1:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:13.3.0:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:13.3.1:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:13.3.2:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:13.4.0:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:13.5.0:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:13.6.0:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:13.7.0:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:13.7.1:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:13.7.2:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:13.8.0:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:13.8.0:rc1:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:13.8.1:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:13.8.2:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:13.9.0:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:13.9.1:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:13.10.0:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:13.10.0:rc1:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:13.11.0:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:13.11.1:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:13.11.2:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:13.12.0:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:13.12.1:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:13.12.2:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:13.13.0:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:14.0.0:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:14.0.0:beta1:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:14.0.0:beta2:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:14.0.0:rc1:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:14.0.0:rc2:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:14.0.1:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:14.0.2:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:14.1.0:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:14.1.1:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:14.1.2:*:*:*:*:*:*:*

OR cpe:/a:digium:asterisk:14.2.0:*:*:*:*:*:*:*

Configuration 2:

cpe:/a:digium:certified_asterisk:11.0.0:*:*:*:*:*:*:*

OR cpe:/a:digium:certified_asterisk:11.0.0:rc1:*:*:*:*:*:*

OR cpe:/a:digium:certified_asterisk:11.0.0:rc2:*:*:*:*:*:*

OR cpe:/a:digium:certified_asterisk:11.1.0:*:*:*:*:*:*:*

OR cpe:/a:digium:certified_asterisk:11.1.0:rc1:*:*:*:*:*:*

OR cpe:/a:digium:certified_asterisk:11.1.0:rc2:*:*:*:*:*:*

OR cpe:/a:digium:certified_asterisk:11.1.0:rc3:*:*:*:*:*:*

OR cpe:/a:digium:certified_asterisk:11.2.0:*:*:*:*:*:*:*

OR cpe:/a:digium:certified_asterisk:11.2.0:rc1:*:*:*:*:*:*

OR cpe:/a:digium:certified_asterisk:11.2.0:rc2:*:*:*:*:*:*

OR cpe:/a:digium:certified_asterisk:11.3.0:*:*:*:*:*:*:*

OR cpe:/a:digium:certified_asterisk:11.3.0:rc1:*:*:*:*:*:*

OR cpe:/a:digium:certified_asterisk:11.3.0:rc2:*:*:*:*:*:*

OR cpe:/a:digium:certified_asterisk:11.4.0:*:*:*:*:*:*:*

OR cpe:/a:digium:certified_asterisk:11.4.0:rc1:*:*:*:*:*:*

OR cpe:/a:digium:certified_asterisk:11.4.0:rc2:*:*:*:*:*:*

OR cpe:/a:digium:certified_asterisk:11.4.0:rc3:*:*:*:*:*:*

OR cpe:/a:digium:certified_asterisk:11.5.0:*:*:*:*:*:*:*

OR cpe:/a:digium:certified_asterisk:11.5.0:rc1:*:*:*:*:*:*

OR cpe:/a:digium:certified_asterisk:11.5.0:rc2:*:*:*:*:*:*

OR cpe:/a:digium:certified_asterisk:11.6:cert1:*:*:*:*:*:*

OR cpe:/a:digium:certified_asterisk:11.6:cert1:*:*:lts:*:*:*

OR cpe:/a:digium:certified_asterisk:11.6:cert10:*:*:lts:*:*:*

OR cpe:/a:digium:certified_asterisk:11.6:cert11:*:*:lts:*:*:*

OR cpe:/a:digium:certified_asterisk:11.6:cert12:*:*:lts:*:*:*

OR cpe:/a:digium:certified_asterisk:11.6:cert13:*:*:lts:*:*:*

OR cpe:/a:digium:certified_asterisk:11.6:cert14:*:*:lts:*:*:*

OR cpe:/a:digium:certified_asterisk:11.6:cert15:*:*:lts:*:*:*

OR cpe:/a:digium:certified_asterisk:11.6:cert1_rc1:*:*:*:*:*:*

OR cpe:/a:digium:certified_asterisk:11.6:cert1_rc2:*:*:*:*:*:*

OR cpe:/a:digium:certified_asterisk:11.6:cert2:*:*:*:*:*:*

OR cpe:/a:digium:certified_asterisk:11.6:cert2:*:*:lts:*:*:*

OR cpe:/a:digium:certified_asterisk:11.6:cert3:*:*:*:*:*:*

OR cpe:/a:digium:certified_asterisk:11.6:cert3:*:*:lts:*:*:*

OR cpe:/a:digium:certified_asterisk:11.6:cert4:*:*:lts:*:*:*

OR cpe:/a:digium:certified_asterisk:11.6:cert5:*:*:lts:*:*:*

OR cpe:/a:digium:certified_asterisk:11.6:cert6:*:*:lts:*:*:*

OR cpe:/a:digium:certified_asterisk:11.6:cert7:*:*:lts:*:*:*

OR cpe:/a:digium:certified_asterisk:11.6:cert8:*:*:lts:*:*:*

OR cpe:/a:digium:certified_asterisk:11.6:cert9:*:*:lts:*:*:*

OR cpe:/a:digium:certified_asterisk:11.6.0:*:*:*:lts:*:*:*

OR cpe:/a:digium:certified_asterisk:11.6.0:-:*:*:*:*:*:*

OR cpe:/a:digium:certified_asterisk:11.6.0:rc1:*:*:*:*:*:*

OR cpe:/a:digium:certified_asterisk:11.6.0:rc2:*:*:*:*:*:*

Configuration CCN 1:

cpe:/a:digium:certified_asterisk:13.8:cert1:*:*:*:*:*:*

Denotes that component is vulnerable

Oval Definitions

Definition ID	Class	Title	Last Modified
oval:com.ubuntu.bionic:def:201699380000000	V	CVE-2016-9938 on Ubuntu 18.04 LTS (bionic) - low.	2016-12-12
oval:com.ubuntu.artful:def:20169938000	V	CVE-2016-9938 on Ubuntu 17.10 (artful) - low.	2016-12-12
oval:com.ubuntu.trusty:def:20169938000	V	CVE-2016-9938 on Ubuntu 14.04 LTS (trusty) - low.	2016-12-12
oval:com.ubuntu.xenial:def:201699380000000	V	CVE-2016-9938 on Ubuntu 16.04 LTS (xenial) - low.	2016-12-12
oval:com.ubuntu.bionic:def:20169938000	V	CVE-2016-9938 on Ubuntu 18.04 LTS (bionic) - low.	2016-12-12
oval:com.ubuntu.xenial:def:20169938000	V	CVE-2016-9938 on Ubuntu 16.04 LTS (xenial) - low.	2016-12-12
oval:com.ubuntu.disco:def:201699380000000	V	CVE-2016-9938 on Ubuntu 19.04 (disco) - low.	2016-12-12
oval:com.ubuntu.cosmic:def:20169938000	V	CVE-2016-9938 on Ubuntu 18.10 (cosmic) - low.	2016-12-12
oval:com.ubuntu.cosmic:def:201699380000000	V	CVE-2016-9938 on Ubuntu 18.10 (cosmic) - low.	2016-12-12
oval:com.ubuntu.precise:def:20169938000	V	CVE-2016-9938 on Ubuntu 12.04 LTS (precise) - low.	2016-12-12