Is CVE-2016-7564 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2016-7564 being exploited in the wild.

How severe is CVE-2016-7564?

High severity, with a CVSS score of 7.5, published 18 January 2017.

Which products and versions are affected?

Artifex Software MuJS versions prior to commit a3a4fe8.

Is there a fix for CVE-2016-7564?

A patch was published on 2016-09-20: Fixed in MuJS source repository Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2016-7564 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2016-7564?

Check whether you run Artifex Mujs. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2016-7564: Artifex Software MuJS heap overflow in Fp_toString

CVE-2016-7564 · Severity: high · CVSS 7.5 · Published 2017-01-18

MuJS is a lightweight JavaScript interpreter often embedded in other software to provide scripting capabilities. A vulnerability in how it handles function names and parameters can allow an attacker to crash the application by providing specially crafted input. This results in a denial of service, potentially disrupting operations or services that rely on the MuJS engine.

Technologies: Artifex Mujs. Vendors: Artifex.

Quick answers

Is CVE-2016-7564 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2016-7564 being exploited in the wild.
How severe is CVE-2016-7564?: High severity, with a CVSS score of 7.5, published 18 January 2017.
Which products and versions are affected?: Artifex Software MuJS versions prior to commit a3a4fe8.
Is there a fix for CVE-2016-7564?: A patch was published on 2016-09-20: Fixed in MuJS source repository Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2016-7564 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2016-7564?: Check whether you run Artifex Mujs. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A heap-based buffer overflow exists in the Fp_toString function within jsfunction.c of the MuJS library. The vulnerability is caused by an off-by-one error where the code fails to allocate sufficient memory for the terminating null byte when calculating the string length for a function's representation. An attacker can trigger this overflow by providing crafted input that populates function names or parameters in a specific way, leading to a memory corruption (WRITE of size 1) and a subsequent crash. The issue was fixed in commit a3a4fe840b80706c706e86160352af5936f292d8.

Affected products

Artifex Software MuJS versions prior to commit a3a4fe8

Timeline

2016-09-20: disclosed: Vulnerability discovered and reported by Shi Ji
2016-09-20: patched: Fixed in MuJS source repository
2017-01-18: advisory: NVD publication date

References

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