Remote Code Execution in Embedthis GoAhead CGI Environment Handling
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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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.
Mitigation
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos (1 hidden).
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.
Affected products & vendors
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A GoAhead Web Server vulnerability referenced as one of multiple exploits used in mass scanning activity.
A GoAhead web server remote code execution vulnerability included in the attackers' mass scanning/exploitation attempts.
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.