Is CVE-2016-7563 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2016-7563 being exploited in the wild.

How severe is CVE-2016-7563?

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

Which products and versions are affected?

Artifex Software MuJS unspecified.

Is there a fix for CVE-2016-7563?

A patch was published on 2016-09-20: Fixed in commit f8234d830e17fc5e8fe09eb76d86dad3f6233c59 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2016-7563 attacked?

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

Am I affected by CVE-2016-7563?

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-2016-7563: Artifex Software MuJS out-of-bounds read in chartorune

CVE-2016-7563 · Severity: high · CVSS 7.5 · Published 2017-01-18

MuJS is a lightweight JavaScript interpreter used in various applications to execute scripts. A vulnerability was found where providing a specially crafted script ending with a specific character (an asterisk) can cause the software to crash. This could allow an attacker to disrupt services or applications that rely on MuJS to process untrusted input.

Technologies: Artifex Mujs. Vendors: Artifex.

Quick answers

Is CVE-2016-7563 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2016-7563 being exploited in the wild.
How severe is CVE-2016-7563?: High severity, with a CVSS score of 7.5, published 18 January 2017.
Which products and versions are affected?: Artifex Software MuJS unspecified.
Is there a fix for CVE-2016-7563?: A patch was published on 2016-09-20: Fixed in commit f8234d830e17fc5e8fe09eb76d86dad3f6233c59 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2016-7563 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2016-7563?: 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

An out-of-bounds read (CWE-125) exists in the MuJS JavaScript engine within the `chartorune` function (located in `utf.c`). The root cause is in the lexical analyzer's `lexcomment` function, which fails to properly validate bounds when encountering a '*' character at the end of a multi-line comment. If the input ends abruptly with an asterisk, the engine unconditionally attempts to read the next character, leading to a 1-byte heap-buffer-overflow read. This can be triggered by providing a malicious JavaScript file or string to the interpreter, resulting in a crash (Denial of Service). The issue was addressed in commit f8234d830e17fc5e8fe09eb76d86dad3f6233c59.

Affected products

Artifex Software MuJS unspecified

Timeline

2016-09-20: disclosed: Vulnerability reported by Shi Ji (@Puzzor)
2016-09-20: patched: Fixed in commit f8234d830e17fc5e8fe09eb76d86dad3f6233c59
2017-01-18: advisory: NVD publication date

References

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