Description

The ADDW macro in stdio-common/vfscanf.c in the GNU C Library (aka glibc or libc6) before 2.21 does not properly consider data-type size during a risk-management decision for use of the alloca function, which might allow context-dependent attackers to cause a denial of service (segmentation violation) or overwrite memory locations beyond the stack boundary via a long line containing wide characters that are improperly handled in a wscanf call.

References

http://openwall.com/lists/oss-security/2015/02/04/1

http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html

http://www.securityfocus.com/bid/72499

http://www.ubuntu.com/usn/USN-2519-1

https://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commit;h=5bd80bfe9ca0d955bfbbc002781bc7b01b6bcb06

Details

Risk Information

CVSS v2