An issue was discovered in chan_skinny.c in Asterisk Open Source 13.18.2 and older, 14.7.2 and older, and 15.1.2 and older, and Certified Asterisk 13.13-cert7 and older. If the chan_skinny (aka SCCP protocol) channel driver is flooded with certain requests, it can cause the asterisk process to use excessive amounts of virtual memory, eventually causing asterisk to stop processing requests of any kind.

Update to upstream 14.7.4 release to address AST-2017-012 security issue

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Update to upstream 14.7.3 release for security alert AST-2017-013

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Update to upstream 14.7.2 release for bug fixes

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website.
Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Multiple vulnerabilities have been discovered in Asterisk, an open source PBX and telephony toolkit, which may result in denial of service, information disclosure and potentially the execution of arbitrary code.

A vulnerability has been discovered in Asterisk, an open source PBX and telephony toolkit, which may result in resource exhaustion and denial of service.

CVE-2017-17090: memory leak from chan_skinny. If the chan_skinny (AKA SCCP protocol) channel driver is flooded with certain requests it can cause the asterisk process to use excessive amounts of virtual memory eventually causing asterisk to stop processing requests of any kind.
The chan_skinny driver has been updated to release memory allocations in a correct manner thereby preventing any possiblity of exhaustion.

For Debian 7 'Wheezy', these problems have been fixed in version 1:1.8.13.1~dfsg1-3+deb7u8.

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 13.x prior to 13.18.3, 14.x prior to 14.7.3, 15.x prior to 15.1.3, or 13.13 prior to 13.13-cert8. It is therefore, affected by a memory exhaustion remote denial-of-service attack as described in AST-2017-013.

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 :

If the chan_skinny (AKA SCCP protocol) channel driver is flooded with certain requests it can cause the asterisk process to use excessive amounts of virtual memory eventually causing asterisk to stop processing requests of any kind.

ID	Name	Product	Family	Severity
105895	Fedora 27 : asterisk (2017-66e9367f7e)	Nessus	Fedora Local Security Checks	high
105498	Debian DSA-4076-1 : asterisk - security update	Nessus	Debian Local Security Checks	high
105494	Debian DLA-1225-1 : asterisk security update	Nessus	Debian Local Security Checks	high
105041	Asterisk 13.x < 13.18.3 / 14.x < 14.7.3 / 15.x < 15.1.3 / 13.13 < 13.13-cert8 Memory Exhaustion Remote DoS (AST-2017-013)	Nessus	Misc.	high
104985	FreeBSD : asterisk -- DOS Vulnerability in Asterisk chan_skinny (e91cf90c-d6dd-11e7-9d10-001999f8d30b)	Nessus	FreeBSD Local Security Checks	high

Detections

Analytics

CVE-2017-17090

high

Tenable Plugins

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high

high

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