Heap-based buffer overflow in Glibc - CVE-2015-8983

Detailed vulnerability description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error in Integer overflow in the _IO_wstr_overflow function in libio/wstrops.c in the GNU C Library (aka glibc or libc6) before 2.22. A remote attacker can use vectors related to computing a size in bytes to trigger a heap-based buffer overflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

How to mitigate CVE-2015-8983

Sources

• http://www.openwall.com/lists/oss-security/2017/02/14/9
• http://www.securityfocus.com/bid/72740
• https://sourceware.org/bugzilla/show_bug.cgi?id=17269
• https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=bdf1ff052a8e23d637f2c838fa5642d78fcedc33
• https://www.sourceware.org/ml/libc-alpha/2015-08/msg00609.html