Digium Asterisk up to 15.6.1/16.0.0 DNS SRV/NAPTR Lookup memory corruption

Summaryinfo

A vulnerability was found in Digium Asterisk up to 15.6.1/16.0.0. It has been classified as critical. Affected by this issue is some unknown functionality of the component DNS SRV/NAPTR Lookup Handler. Performing a manipulation results in memory corruption. This vulnerability is identified as CVE-2018-19278. The attack can be initiated remotely. There is not any exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability, which was classified as critical, was found in Digium Asterisk up to 15.6.1/16.0.0 (Communications System). This affects an unknown code block of the component DNS SRV/NAPTR Lookup Handler. The manipulation with an unknown input leads to a memory corruption vulnerability. CWE is classifying the issue as CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Buffer overflow in DNS SRV and NAPTR lookups in Digium Asterisk 15.x before 15.6.2 and 16.x before 16.0.1 allows remote attackers to crash Asterisk via a specially crafted DNS SRV or NAPTR response, because a buffer size is supposed to match an expanded length but actually matches a compressed length.

The bug was discovered 11/14/2018. The weakness was released 11/14/2018 (Website). It is possible to read the advisory at downloads.asterisk.org. This vulnerability is uniquely identified as CVE-2018-19278 since 11/14/2018. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 118974 (Asterisk 15.x < 15.6.2 / 16.x < 16.0.1 DoS (AST-2018-010)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Misc. and running in the context r. The commercial vulnerability scanner Qualys is able to test this issue with plugin 371323 (Asterisk Open Source Denial of Service Vulnerability (AST-2018-010)).

Upgrading to version 15.6.2 or 16.0.1 eliminates this vulnerability. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (118974). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

• Communications System

Vendor

• Digium

Name

• Asterisk

Version

• 15.6.0
• 15.6.1
• 16.0

License

• open-source

Website

• Vendor: https://www.digium.com/

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