CVE-2012-6711
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.51%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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 3.0
- 7.8 HIGHCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.51% probability · 42th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-119
- Affected
- gnu/bash · redhat/enterprise linux
- Source
- cve@mitre.org
References
- http://git.savannah.gnu.org/cgit/bash.git/commit/?h=devel&id=863d31ae775d56b785dc5b0105b6d251515d81d5Mailing List, Patch, Third Party Advisory
- http://www.securityfocus.com/bid/108824
- https://bugzilla.redhat.com/show_bug.cgi?id=1721071Issue Tracking, Third Party Advisory
- https://support.f5.com/csp/article/K05122252
- https://support.f5.com/csp/article/K05122252?utm_source=f5support&%3Butm_medium=RSS
- https://usn.ubuntu.com/4180-1/
- http://git.savannah.gnu.org/cgit/bash.git/commit/?h=devel&id=863d31ae775d56b785dc5b0105b6d251515d81d5Mailing List, Patch, Third Party Advisory
- http://www.securityfocus.com/bid/108824
- https://bugzilla.redhat.com/show_bug.cgi?id=1721071Issue Tracking, Third Party Advisory
- https://support.f5.com/csp/article/K05122252
- https://support.f5.com/csp/article/K05122252?utm_source=f5support&%3Butm_medium=RSS
- https://usn.ubuntu.com/4180-1/
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.