A Buffer Overflow issue was discovered in Asterisk through 13.19.1, 14.x through 14.7.5, and 15.x through 15.2.1, and Certified Asterisk through 13.18-cert2. When processing a SUBSCRIBE request, the res_pjsip_pubsub module stores the accepted formats present in the Accept headers of the request. This code did not limit the number of headers it processed, despite having a fixed limit of 32. If more than 32 Accept headers were present, the code would write outside of its memory and cause a crash.

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

According to its SIP banner, the version of Asterisk running on the remote host is 13.x prior to 13.19.2, 14.x prior to 14.7.6, or 13.18 prior to 13.18-cert3. It is therefore, affected by a Multiple Denial of Service Vulnerabilities as described in AST-2018-002, AST-2018-003, AST-2018-004, & AST-2018-005 advisories.

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

According to its SIP banner, the version of Asterisk running on the remote host is 15.x prior to 15.2.2. It is therefore, affected by multiple vulnerabilities as described in AST-2018-001, AST-2018-002, AST-2018-003, AST-2018-004, AST-2018-005, & AST-2018-006 advisories.

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-2018-004 - When processing a SUBSCRIBE request the res_pjsip_pubsub module stores the accepted formats present in the Accept headers of the request. This code did not limit the number of headers it processed despite having a fixed limit of 32. If more than 32 Accept headers were present the code would write outside of its memory and cause a crash.

AST-2018-005 - A crash occurs when a number of authenticated INVITE messages are sent over TCP or TLS and then the connection is suddenly closed. This issue leads to a segmentation fault.

ID	Name	Product	Family	Severity
118158	Debian DSA-4320-1 : asterisk - security update	Nessus	Debian Local Security Checks	medium
107101	Asterisk 13.x < 13.19.2 / 14.x < 14.7.6 / 13.13 < 13.18-cert3 Multiple DoS Vulnerabilities (AST-2018-002, AST-2018-003, AST-2018-004, & AST-2018-005)	Nessus	Misc.	high
107100	Asterisk 15.x < 15.2.2 Multiple Vulnerabilities (AST-2018-001 - AST-2018-006)	Nessus	Misc.	high
106959	FreeBSD : asterisk -- multiple vulnerabilities (933654ce-17b8-11e8-90b8-001999f8d30b)	Nessus	FreeBSD Local Security Checks	high

Detections

Analytics

CVE-2018-7284

high

Tenable Plugins

medium

high

high

high