Vulnerability 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().
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Gnu | Bash | >= 4.2, <= 4.3 |
| Redhat | Enterprise Linux | 7.0 |
Related Weaknesses (CWE)
References
- http://git.savannah.gnu.org/cgit/bash.git/commit/?h=devel&id=863d31ae775d56b785dMailing ListPatchThird Party Advisory
- http://www.securityfocus.com/bid/108824
- https://bugzilla.redhat.com/show_bug.cgi?id=1721071Issue TrackingThird Party Advisory
- https://support.f5.com/csp/article/K05122252
- https://support.f5.com/csp/article/K05122252?utm_source=f5support&%3Butm_medi
- https://usn.ubuntu.com/4180-1/
- http://git.savannah.gnu.org/cgit/bash.git/commit/?h=devel&id=863d31ae775d56b785dMailing ListPatchThird Party Advisory
- http://www.securityfocus.com/bid/108824
- https://bugzilla.redhat.com/show_bug.cgi?id=1721071Issue TrackingThird Party Advisory
- https://support.f5.com/csp/article/K05122252
- https://support.f5.com/csp/article/K05122252?utm_source=f5support&%3Butm_medi
- https://usn.ubuntu.com/4180-1/
FAQ
What is CVE-2012-6711?
CVE-2012-6711 is a vulnerability with a CVSS score of 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 fun...
How severe is CVE-2012-6711?
CVE-2012-6711 has been rated HIGH with a CVSS base score of 7.0/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2012-6711?
Check the references section above for vendor advisories and patch information. Affected products include: Gnu Bash, Redhat Enterprise Linux.