The getaddrinfo function in glibc before 2.15, when compiled with libidn and the AI_IDN flag is used, allows context-dependent attackers to cause a denial of service (invalid free) and possibly execute arbitrary code via unspecified vectors, as demonstrated by an internationalized domain name to ping6.

References

• https://nvd.nist.gov/vuln/detail/CVE-2013-7424
• https://bugzilla.redhat.com/show_bug.cgi?id=1186614
• https://bugzilla.redhat.com/show_bug.cgi?id=981942
• https://sourceware.org/bugzilla/show_bug.cgi?id=18011
• https://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=2e96f1c7
• http://rhn.redhat.com/errata/RHSA-2015-1627.html
• http://www.openwall.com/lists/oss-security/2015/01/29/21
• http://www.securityfocus.com/bid/72710