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Q1What is this vulnerability? (Essence + Consequences)
๐จ **Essence**: A Local File Inclusion (LFI) / Path Traversal bug in ProcessWire CMS. ๐ฅ **Consequences**: Attackers can read sensitive server files via the `download` parameter in `index.php`.โฆ
๐ก๏ธ **Root Cause**: Improper input validation in the `download` parameter of `index.php`. ๐ **CWE**: Path Traversal (allows accessing files outside the intended directory).
Q3Who is affected? (Versions/Components)
๐ฅ **Affected**: ProcessWire CMS versions **prior to 2.7.1**. ๐ข **Vendor**: Ryan Cramer Design. โ ๏ธ **Note**: If you are running v2.7.1 or later, you are likely safe.
Q4What can hackers do? (Privileges/Data)
๐ต๏ธ **Attacker Capabilities**: Remote retrieval of sensitive files. ๐ **Data Impact**: Can expose configuration files, source code, or system secrets. No authentication required for the initial file read.
Q5Is exploitation threshold high? (Auth/Config)
๐ **Threshold**: **LOW**. ๐ **Auth**: No authentication needed. โ๏ธ **Config**: Exploitable via the `download` parameter in the URL. Easy to trigger remotely.
Q6Is there a public Exp? (PoC/Wild Exploitation)
๐ป **Public Exploit**: Yes. ๐ **PoC Available**: GitHub repositories (e.g., `ceng-yildirim/LFI-processwire`) and Nuclei templates exist. ๐ **Wild Exploitation**: High risk due to available automated tools.
Q7How to self-check? (Features/Scanning)
๐ **Self-Check**: Scan for ProcessWire instances. ๐งช **Test**: Use the `download` parameter in `index.php` with path traversal sequences (e.g., `../../etc/passwd`). ๐ก **Tools**: Use Nuclei templates for CVE-2020-27467.
Q8Is it fixed officially? (Patch/Mitigation)
๐ ๏ธ **Official Fix**: Yes. โ **Patch**: Upgrade to ProcessWire CMS **version 2.7.1 or higher**. The vulnerability is resolved in this release.
Q9What if no patch? (Workaround)
๐ง **No Patch Workaround**: If upgrading is impossible, restrict access to `index.php`. ๐ซ **WAF**: Block requests with path traversal characters (`../`) in the `download` parameter.โฆ
โก **Urgency**: **HIGH**. ๐ **Priority**: Patch immediately. ๐ **Risk**: Unauthenticated LFI is critical. Even though it's an older CVE, unpatched legacy systems are prime targets.