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 memory allocation, which allows context-dependent attackers to cause a denial of service (buffer overflow) or possibly have unspecified other impact via a long line containing wide characters that are improperly handled in a wscanf call.

References

• https://nvd.nist.gov/vuln/detail/CVE-2015-1472
• https://seclists.org/bugtraq/2019/Jun/14
• https://seclists.org/bugtraq/2019/Sep/7
• https://security.gentoo.org/glsa/201602-02
• https://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commit;h=5bd80bfe9ca0d955bfbbc002781bc7b01b6bcb06
• https://sourceware.org/ml/libc-alpha/2015-02/msg00119.html
• http://openwall.com/lists/oss-security/2015/02/04/1
• http://packetstormsecurity.com/files/153278/WAGO-852-Industrial-Managed-Switch-Series-Code-Execution-Hardcoded-Credentials.html
• http://packetstormsecurity.com/files/154361/Cisco-Device-Hardcoded-Credentials-GNU-glibc-BusyBox.html
• http://seclists.org/fulldisclosure/2019/Jun/18
• http://seclists.org/fulldisclosure/2019/Sep/7
• http://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.html
• http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html
• http://www.securityfocus.com/bid/72428
• http://www.ubuntu.com/usn/USN-2519-1
• https://sourceware.org/git/gitweb.cgi?p=glibc.git%3Ba=commit%3Bh=5bd80bfe9ca0d955bfbbc002781bc7b01b6bcb06