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CVE-2012-6711

7.0 · HIGH

A heap-based buffer overflow exists in GNU Bash before 4.3 when wide characters, not supported by the current locale set in the LC_CTYPE environment variable, are printed through the echo built-in…

Published Jun 18, 2019CWE-119EPSS 0.53%

Overview

CVE-2012-6711 is a high-severity vulnerability. It was published on June 18, 2019 and has a CVSS 3.0 base score of 7.0 (HIGH).

This vulnerability has a CVSS 3.0 base score of 7.0, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

A heap-based buffer overflow exists in GNU Bash before 4.3 when wide characters, not supported by the current locale set in the LC_CTYPE environment variable, are printed through the echo built-in function. A local attacker, who can provide data to print through the "echo -e" built-in function, may use this flaw to crash a script or execute code with the privileges of the bash process. This occurs because ansicstr() in lib/sh/strtrans.c mishandles u32cconv().

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.savannah.gnu.org/cgit/bash.git/commit/?h=devel&id=863d31ae775d56b785dc5b0105b6d251515d81d5Refwww.securityfocus.com/bid/108824Refbugzilla.redhat.com/show_bug.cgi?id=1721071Refsupport.f5.com/csp/article/K05122252Refsupport.f5.com/csp/article/K05122252?utm_source=f5support&amp%3Butm_medium=RSSRefusn.ubuntu.com/4180-1/Refgit.savannah.gnu.org/cgit/bash.git/commit/?h=devel&id=863d31ae775d56b785dc5b0105b6d251515d81d5Refwww.securityfocus.com/bid/108824Refbugzilla.redhat.com/show_bug.cgi?id=1721071Refsupport.f5.com/csp/article/K05122252

How CyberStrike helps

Frequently asked questions

What is CVE-2012-6711?

CVE-2012-6711 is a high-severity vulnerability. It was published on June 18, 2019 and has a CVSS 3.0 base score of 7.0 (HIGH).

How severe is CVE-2012-6711?

This vulnerability has a CVSS 3.0 base score of 7.0, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2012-6711?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2012-6711?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2012-6711 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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