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Embedthis GoAhead before 3.6.5 allows remote code execution if CGI is enabled and a CGI program is dynamically linked. This is a result of initializing the environment of forked CGI scripts using untrusted HTTP request parameters in the cgiHandler function in cgi.c. When combined with the glibc dynamic linker, this behaviour can be abused for remote code execution using special parameter names such as LD_PRELOAD. An attacker can POST their shared object payload in the body of the request, and reference it using /proc/self/fd/0.

• https://github.com/elttam/advisories/tree/master/CVE-2017-17562 x_refsource_MISC
• http://www.securitytracker.com/id/1040702 vdb-entryx_refsource_SECTRACK
• https://www.elttam.com.au/blog/goahead/ x_refsource_MISC
• https://www.exploit-db.com/exploits/43360/ exploitx_refsource_EXPLOIT-DB
• http://www.oracle.com/technetwork/security-advisory/cpuapr2018-3678067.html x_refsource_CONFIRM
• https://github.com/embedthis/goahead/commit/6f786c123196eb622625a920d54048629a7caa74 x_refsource_MISC
• https://github.com/embedthis/goahead/issues/249 x_refsource_MISC
• https://www.exploit-db.com/exploits/43877/ exploitx_refsource_EXPLOIT-DB
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2017-17562 government-resource