A vulnerability classified as problematic has been found in yajl-ruby gem 1.3.0 on Ruby (Ruby Gem). This affects the function Yajl::Parser.new.parse of the file yajl_encode.c. The manipulation with an unknown input leads to a format string vulnerability. CWE is classifying the issue as CWE-134. The software uses a function that accepts a format string as an argument, but the format string originates from an external source. This is going to have an impact on availability.

The bug was discovered 11/02/2017. The weakness was published 11/03/2017 (Website). The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2017-16516 since 11/03/2017. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details are known, but no exploit is available.

The vulnerability was handled as a non-public zero-day exploit for at least 1 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 104464 (Debian DLA-1167-1 : ruby-yajl security update), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Debian Local Security Checks and running in the context local.

Upgrading eliminates this vulnerability. A possible mitigation has been published 5 days after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (104464).

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• Ruby Gem

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• yajl-ruby gem

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