Signature Detail

HTTP: EmbedThis GoAhead Web Server Remote Code Execution

This signature detects attempts to exploit a known vulnerability against EmbedThis GoAhead Web Server. A successful attack can lead to arbitrary code execution under the security context of the server process

Extended Description

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.

Affected Products

• Embedthis goahead -
• Embedthis goahead 2.1.5
• Embedthis goahead 2.1.8
• Embedthis goahead 2.5.0
• Embedthis goahead 3.0.0
• Embedthis goahead 3.1.0
• Embedthis goahead 3.1.1
• Embedthis goahead 3.1.2
• Embedthis goahead 3.1.3
• Embedthis goahead 3.3.0
• Embedthis goahead 3.3.1
• Embedthis goahead 3.3.2
• Embedthis goahead 3.3.3
• Embedthis goahead 3.3.4
• Embedthis goahead 3.3.5
• Embedthis goahead 3.3.6
• Embedthis goahead 3.4.0
• Embedthis goahead 3.4.1
• Embedthis goahead 3.4.10
• Embedthis goahead 3.4.11
• Embedthis goahead 3.4.12
• Embedthis goahead 3.4.2
• Embedthis goahead 3.4.3
• Embedthis goahead 3.4.4
• Embedthis goahead 3.4.5
• Embedthis goahead 3.4.6
• Embedthis goahead 3.4.7
• Embedthis goahead 3.4.8
• Embedthis goahead 3.4.9
• Embedthis goahead 3.5.0
• Embedthis goahead 3.6.0
• Embedthis goahead 3.6.1
• Embedthis goahead 3.6.2
• Embedthis goahead 3.6.3
• Embedthis goahead 3.6.4

References

• CVE: CVE-2017-17562
• URL: https://embedthis.com/blog/posts/2017/goahead-security-update.html
• URL: https://www.elttam.com.au/blog/goahead/