medium
5.5
CWE
416
Advisory Published
CVE Published
Updated

CVE-2016-9401: Use After Free

First published: Fri Nov 18 2016(Updated: )

A vulnerability was found in popd. It can be tricked to free a user supplied address in the following way: $ popd +-111111 This could be used to bypass restricted shells (rsh) on some environments to cause use-after-free. References: <a href="http://seclists.org/oss-sec/2016/q4/445">http://seclists.org/oss-sec/2016/q4/445</a>

Credit: cve@mitre.org

Affected SoftwareAffected VersionHow to fix
GNU Bash<4.4
GNU Bash=4.4-patch1
GNU Bash=4.4-patch2
GNU Bash=4.4-patch3
GNU Bash=4.4-patch4
GNU Bash=4.4-patch5
Debian=8.0
Red Hat Enterprise Linux Desktop=6.0
Red Hat Enterprise Linux Desktop=7.0
Red Hat Enterprise Linux Server=6.0
Red Hat Enterprise Linux Server=7.0
Red Hat Enterprise Linux Server=7.4
Red Hat Enterprise Linux Server=7.6
Red Hat Enterprise Linux Server=7.7
Red Hat Enterprise Linux Server=7.4
Red Hat Enterprise Linux Server=7.5
Red Hat Enterprise Linux Server=7.6
Red Hat Enterprise Linux Server=7.7
Red Hat Enterprise Linux Server=7.6
Red Hat Enterprise Linux Server=7.7
Red Hat Enterprise Linux Workstation=6.0
Red Hat Enterprise Linux Workstation=7.0

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Reference Links

Frequently Asked Questions

  • What is the severity of CVE-2016-9401?

    CVE-2016-9401 is considered a moderate severity vulnerability because it can be exploited to cause a use-after-free condition.

  • How do I fix CVE-2016-9401?

    To fix CVE-2016-9401, users should update to a patched version of GNU Bash that includes the security fix.

  • What types of systems are affected by CVE-2016-9401?

    CVE-2016-9401 affects GNU Bash versions prior to 4.4 and specific patched versions of 4.4.

  • What are the potential impacts of CVE-2016-9401?

    Exploitation of CVE-2016-9401 could allow an attacker to bypass restricted shells and execute unauthorized commands.

  • What versions of GNU Bash are safe from CVE-2016-9401?

    Versions of GNU Bash that have been patched after 4.4 or any version higher than 4.4 are safe from CVE-2016-9401.

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