This is a summary of the AI-generated 10-question deep analysis. The full version (longer answers, follow-up Q&A, related CVEs) requires login. Read the full analysis β
Q1What is this vulnerability? (Essence + Consequences)
π¨ **Essence**: A security flaw in PHP's **PHAR** 404 error handling. <br>β οΈ **Consequences**: Remote attackers can execute **arbitrary script code** in the victim's browser via crafted URLs.β¦
π‘οΈ **Root Cause**: **Insufficient Input Validation**. The program fails to filter user input when generating the 404 error page for PHAR files.β¦
π¦ **Affected Versions**: <br>β’ PHP **5.6.33** and earlier <br>β’ PHP **7.0.x** before 7.0.27 <br>β’ PHP **7.1.x** before 7.1.13 <br>β’ PHP **7.2.x** before 7.2.1 <br>π **Component**: PHP Core (PHAR stream wrapper).
Q4What can hackers do? (Privileges/Data)
π» **Attacker Actions**: <br>β’ Execute **arbitrary JavaScript** in the user's browser. <br>β’ Steal session cookies or credentials. <br>β’ Perform actions on behalf of the victim.β¦
π **Exploitation Threshold**: **LOW**. <br>β’ **Auth**: No authentication required (Remote). <br>β’ **Config**: Requires the server to serve PHAR files and trigger a 404.β¦
π **Public Exploit**: The data lists **vendor advisories** (RedHat, Ubuntu, Debian) and BID 104020, but **no specific PoC code** is provided in the `pocs` array.β¦
π **Self-Check**: <br>1. Check PHP version (`php -v`). <br>2. Look for servers serving `.phar` files. <br>3. Test if accessing a non-existent `.phar` URL injects script tags into the 404 response. <br>4.β¦
π₯ **Urgency**: **HIGH**. <br>β’ **CVSS**: Not provided, but XSS via PHAR is critical. <br>β’ **Impact**: Direct browser compromise. <br>β’ **Recommendation**: Patch immediately.β¦