Original 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().
Affected software
- Bash ≥ 4.2 ≤ 4.3 exact match
Details
- Published
- 2019-06-18
- Last modified
- 2026-06-16
- CVSS vector
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H- CWE
- CWE-119
References
- cve.org/CVE-2012-6711
- nvd.nist.gov/vuln/detail/CVE-2012-6711
- git.savannah.gnu.org/cgit/bash.git/commit/?h=devel&id=863d31ae775d56b785dc5b0105b6d251515d...
- www.securityfocus.com/bid/108824
- bugzilla.redhat.com/show_bug.cgi?id=1721071
- support.f5.com/csp/article/K05122252
- support.f5.com/csp/article/K05122252?utm_source=f5support&%3Butm_medium=RSS
- usn.ubuntu.com/4180-1/
Track these versions on your own servers
InfraGuard collects installed software versions from every server and flags the ones with known vulnerabilities. Self-hosted — nothing leaves your network.
This product uses data from the NVD API but is not endorsed or certified by the NVD. CVE® is a registered trademark of The MITRE Corporation; CVE records are used under the CVE Program Terms of Use.