The "process-execute" and "process-spawn" procedures in CHICKEN Scheme used fixed-size buffers for holding the arguments and environment variables to use in its execve() call. This would allow user-supplied argument/environment variable lists to trigger a buffer overrun. This affects all releases of CHICKEN up to and including 4.11 (it will be fixed in 4.12 and 5.0, which are not yet released).

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - The process-execute and process-spawn procedures in CHICKEN Scheme used fixed-size buffers for holding     the arguments and environment variables to use in its execve() call. This would allow user-supplied     argument/environment variable lists to trigger a buffer overrun. This affects all releases of CHICKEN up     to and including 4.11 (it will be fixed in 4.12 and 5.0, which are not yet released). (CVE-2016-6830)

Note that Nessus relies on the presence of the package as reported by the vendor.

There are packages installed that are affected by multiple vulnerabilities referenced in the following CVEs:

  - The "process-execute" and "process-spawn" procedures in CHICKEN Scheme used fixed-size buffers for holding
    the arguments and environment variables to use in its execve() call. This would allow user-supplied
    argument/environment variable lists to trigger a buffer overrun. This affects all releases of CHICKEN up
    to and including 4.11 (it will be fixed in 4.12 and 5.0, which are not yet released). (CVE-2016-6830)

  - The "process-execute" and "process-spawn" procedures did not free memory correctly when the execve() call
    failed, resulting in a memory leak. This could be abused by an attacker to cause resource exhaustion or a
    denial of service. This affects all releases of CHICKEN up to and including 4.11 (it will be fixed in 4.12
    and 5.0, which are not yet released). (CVE-2016-6831)

Peter Bex reports :

A buffer overflow error was found in the POSIX unit's procedures process-execute and process-spawn.

Additionally, a memory leak existed in this code, which would be triggered when an error is raised during argument and environment processing.

Irregex versions before 0.9.6 contain a resource exhaustion vulnerability: when compiling deeply nested regexes containing the '+' operator due to exponential expansion behaviour.

Security fix for CVE-2016-6830, CVE-2016-6831

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website.
Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Multiple vulnerabilities have been found in the CHICKEN Scheme compiler :

CVE-2016-6830

Buffer overrun in CHICKEN Scheme's 'process-execute' and 'process-spawn' procedures from the posix unit

CVE-2016-6831

Memory leak in CHICKEN Scheme's process-execute and process-spawn procedures

For Debian 7 'Wheezy', these problems have been fixed in version 4.7.0-1+deb7u1.

We recommend that you upgrade your chicken packages.

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

ID	Name	Product	Family	Severity
254866	Linux Distros Unpatched Vulnerability : CVE-2016-6830	Nessus	Misc.	critical
426427	Alpine: multiple chicken packages: security update to 4.11.1-r0	Tenable Cloud Security	Alpine Linux Local Security Checks	critical
426427	Alpine: multiple chicken packages: security update to 4.11.1-r0	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	critical
403802	Alpine: multiple chicken packages: security update to 4.11.1-r0	Tenable Cloud Security	Alpine Linux Local Security Checks	critical
403802	Alpine: multiple chicken packages: security update to 4.11.1-r0	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	critical
400944	Alpine: multiple chicken packages: security update to 4.11.0-r2 (deprecated)	Tenable Cloud Security	Alpine Linux Local Security Checks	critical
400944	Alpine: multiple chicken packages: security update to 4.11.0-r2 (deprecated)	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	critical
96995	FreeBSD : chicken -- multiple vulnerabilities (c6932dd4-eaff-11e6-9ac1-a4badb2f4699)	Nessus	FreeBSD Local Security Checks	critical
96615	Fedora 25 : chicken (2016-9b3ed5f170)	Nessus	Fedora Local Security Checks	critical
96614	Fedora 24 : chicken (2016-0ef628998f)	Nessus	Fedora Local Security Checks	critical
93834	Debian DLA-643-1 : chicken security update	Nessus	Debian Local Security Checks	critical

Detections

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CVE-2016-6830

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