Heap-based Buffer Overflow in GNU Bash when Printing Wide Characters

CVE-2012-6711 · MEDIUM Severity

AV:L/AC:L/AU:N/C:P/I:P/A:P

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().

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