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Mallory
HighCISA KEVExploited in the wildPublic exploit

Remote Code Execution in Embedthis GoAhead CGI Environment Handling

IdentifiersCVE-2017-17562CWE-15

Embedthis GoAhead before 3.6.5 is vulnerable to remote code execution when CGI support is enabled and the target CGI program is dynamically linked. The flaw is in the cgiHandler function in cgi.c, which initializes the environment for forked CGI scripts using untrusted HTTP request parameters. Because attacker-controlled request parameters are copied into the CGI process environment, an attacker can supply special environment variable names understood by the glibc dynamic linker, such as LD_PRELOAD. By POSTing a shared object payload in the request body and referencing it via /proc/self/fd/0, the attacker can cause the dynamic linker to load attacker-supplied code when the CGI program starts, resulting in arbitrary code execution.

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation allows unauthenticated remote arbitrary code execution in the context of the GoAhead web server/CGI process. An attacker can execute attacker-supplied code on the target system, which may lead to full compromise of the device or application, installation of malware, persistence, lateral movement, or further privilege escalation depending on the privileges of the web server and local system configuration.

Mitigation

If you can’t patch tonight, do this now.

Disable CGI support if it is not strictly required. Avoid use of dynamically linked CGI executables where possible, or isolate them in a constrained environment. Restrict exposure of the GoAhead service to trusted networks, place it behind filtering or reverse proxies, and monitor for suspicious requests containing linker-related variable names such as LD_PRELOAD. Additional hardening such as sandboxing the web server/CGI execution context and minimizing process privileges can reduce post-exploitation impact.

Remediation

Patch, then assume compromise.

Upgrade Embedthis GoAhead to version 3.6.5 or later, where the vulnerable behavior is addressed. Review and harden any deployments using CGI, especially those invoking dynamically linked binaries. If an upgrade cannot be performed immediately, remove or disable vulnerable CGI functionality and ensure the web server does not pass untrusted request parameters into process environment variables in a way that can influence the dynamic linker.
PUBLIC EXPLOITS

Exploits

1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos (1 hidden).

VALID 1 / 2 TOTALView more in app
goahead-rce-exploitMaturityPoCVerified exploit

This repository contains a Python exploit (exploit.py) for CVE-2017-17562, a remote code execution vulnerability in GoAhead Web Server versions prior to 3.6.5. The exploit targets servers with CGI enabled and at least one dynamically linked CGI program. The attacker must generate a malicious ELF shared object payload (e.g., with msfvenom) and provide it to the script, which then probes a list of possible CGI endpoints (from paths.lst) on the target server. If a vulnerable endpoint is found, the script uploads the payload via HTTP POST with the LD_PRELOAD environment variable set, triggering execution of the attacker's code. The README.md provides detailed usage instructions, including payload generation and listener setup. The repository structure is straightforward: exploit.py (main exploit script), paths.lst (CGI endpoint wordlist), requirements.txt (Python dependencies), and README.md (documentation). The exploit is operational and requires attacker-supplied payloads, providing remote code execution on vulnerable GoAhead servers.

nu11pointerDisclosed Nov 14, 2021pythonnetwork
EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType
EmbedthisGoaheadapplication
OracleIntegrated Lights Out Managerapplication

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Threat actor evidence

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Associated malware

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Detection signatures1

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Social activity

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