In Asterisk 11.x before 11.25.2, 13.x before 13.17.1, and 14.x before 14.6.1 and Certified Asterisk 11.x before 11.6-cert17 and 13.x before 13.13-cert5, unauthorized command execution is possible. The app_minivm module has an "externnotify" program configuration option that is executed by the MinivmNotify dialplan application. The application uses the caller-id name and number as part of a built string passed to the OS shell for interpretation and execution. Since the caller-id name and number can come from an untrusted source, a crafted caller-id name or number allows an arbitrary shell command injection.

The remote host is affected by the vulnerability described in GLSA-201710-29 (Asterisk: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in Asterisk. Please review       the referenced CVE identifiers for details.
  Impact :

    A remote attacker could execute arbitrary code, cause a denial of       service condition, or cause an unauthorized data disclosure by enticing a       user to run malicious code.
  Workaround :

    There is no known workaround at this time.

A security vulnerability was discovered in Asterisk, an Open Source PBX and telephony toolkit, that may lead to unauthorized command execution.

The app_minivm module has an 'externnotify' program configuration option that is executed by the MinivmNotify dialplan application. The application uses the caller-id name and number as part of a built string passed to the OS shell for interpretation and execution. Since the caller-id name and number can come from an untrusted source, a crafted caller-id name or number allows an arbitrary shell command injection.

For Debian 7 'Wheezy', these problems have been fixed in version 1:1.8.13.1~dfsg1-3+deb7u7.

We recommend that you upgrade your asterisk packages.

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

According to its SIP banner, the version of Asterisk running on the remote host is 11.x prior to 11.25.2, 13.x prior to 13.17.1, 14.x prior to 14.6.1, 11.6 prior to 11.6-cert17, or 13.13 prior to 13.13-cert5. It is therefore, affected by multiple vulnerabilities as described in AST-2017-005, AST-2017-006, and AST-2017-007.

Note for AST-2017-005, only 11.4.0 is affected in the 11.x branch.

Also note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Asterisk project reports :

AST-2017-005 - A change was made to the strict RTP support in the RTP stack to better tolerate late media when a reinvite occurs. When combined with the symmetric RTP support this introduced an avenue where media could be hijacked. Instead of only learning a new address when expected the new code allowed a new source address to be learned at all times.

AST-2017-006 - The app_minivm module has an 'externnotify' program configuration option that is executed by the MinivmNotify dialplan application. The application uses the caller-id name and number as part of a built string passed to the OS shell for interpretation and execution. Since the caller-id name and number can come from an untrusted source, a crafted caller-id name or number allows an arbitrary shell command injection.

Multiple vulnerabilities have been discovered in Asterisk, an open source PBX and telephony toolkit, which may result in disclosure of RTP connections or the execution of arbitrary shell commands.

For additional information please refer to the upstream advisories:
http://downloads.asterisk.org/pub/security/AST-2017-005.html, http://downloads.asterisk.org/pub/security/AST-2017-006.html

ID	Name	Product	Family	Severity
104230	GLSA-201710-29 : Asterisk: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	critical
103683	Debian DLA-1122-1 : asterisk security update	Nessus	Debian Local Security Checks	critical
102958	Asterisk 11.x < 11.25.2 / 11.6 < 11.6-cert17 / 13.x < 13.17.1 / 14.x < 14.6.1 / 13.13 < 13.13-cert5 Multiple Vulnerabilities (AST-2017-005 - AST-2017-007)	Nessus	Misc.	critical
102940	FreeBSD : asterisk -- Unauthorized data disclosure and shell access command injection in app_minivm (c599f95c-8ee5-11e7-8be8-001999f8d30b)	Nessus	FreeBSD Local Security Checks	critical
102931	Debian DSA-3964-1 : asterisk - security update	Nessus	Debian Local Security Checks	critical

Detections

Analytics

CVE-2017-14100

critical

Tenable Plugins

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critical

critical

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critical