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GHSA-mrc5-3mm3-45c5
backpack/crudbackpack/crudbackpack/crudSummary
Backpack\CRUD\Stats::makeCurlRequest builds a shell command using unescaped input that originates from the HTTP Host header, then passes it to exec(). A specially crafted Host header can break out of the shell argument and cause the server to execute arbitrary OS commands as the web user.
The vulnerable code path is reached from BackpackServiceProvider::boot() on every HTTP request in production when exec() and curl are available. A 1-in-100 random gate is the only guard — an attacker can reliably trigger it by retrying.
Severity
High — CVSS 8.1
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Complexity is rated High because default nginx and Apache configurations typically strip or reject malformed Host headers before they reach PHP, and exec() is often disabled for web processes in hardened environments. Both mitigations must be absent for exploitation.
Impact
A successful exploit yields OS command execution as the web server user (www-data, nginx, etc.), giving an unauthenticated attacker access to environment secrets (APP_KEY, database credentials, API keys in .env), the filesystem, and any service the server can reach.
Fix
makeCurlRequest was replaced with the Guzzle-based path already present in the codebase, eliminating the shell-command construction entirely. Upgrade to a patched release immediately.
Affected versions
| Branch | Vulnerable range | First safe version |
|--------|-----------------|-------------------|
| 4.1.x | < 4.1.70 | 4.1.70 |
| 5.x | < 5.6.2 | 5.6.2 |
| 6.x | < 6.8.13 | 6.8.13 |
| 7.x | < 7.0.36 | 7.0.36 |
Credits
Reported by Vishal Shukla (@shukla304) via sechub.dev AI Agent.
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The vulnerability can be exploited over the network without needing physical access. It is difficult for an attacker to exploit this vulnerability and may require special conditions. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the confidentiality of the information. There is a high impact on the integrity of the data. There is a high impact on the availability of the system.
Exploitation activity has been observed. Apply available patches or mitigations urgently.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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