Integer overflow in the _IO_wstr_overflow function in libio/wstrops.c in the GNU C Library (aka glibc or libc6) before 2.22 allows context-dependent attackers to cause a denial of service (application crash) or possibly execute arbitrary code via vectors related to computing a size in bytes, which triggers a heap-based buffer overflow.

References

• https://nvd.nist.gov/vuln/detail/CVE-2015-8983
• 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
• http://www.openwall.com/lists/oss-security/2017/02/14/9
• http://www.securityfocus.com/bid/72740