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).

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
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

Analytics

CVE-2016-6831

high

Tenable Plugins

critical

critical

critical

critical