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Q1What is this vulnerability? (Essence + Consequences)
๐จ **Essence**: A critical flaw in Mozilla's PDF reader allows bypassing the Same-Origin Policy (SOP). ๐ **Consequences**: Attackers can read arbitrary local files or escalate privileges via crafted JavaScript.โฆ
๐ก๏ธ **Root Cause**: Improper handling of JavaScript within the PDF viewer component. The native adapter fails to isolate content correctly, allowing cross-origin data leakage. (CWE not specified in data).
Q3Who is affected? (Versions/Components)
๐ฆ **Affected**: Mozilla Firefox, Firefox ESR, and Firefox OS. ๐ **Timeline**: Published Aug 8, 2015. Specifically impacts versions **< 39.0.3**.
Q4What can hackers do? (Privileges/Data)
๐ **Attacker Actions**: Read arbitrary files from the victim's system. ๐ **Data Access**: Bypass SOP to access sensitive local data. โก **Privileges**: Potential privilege escalation via native adapter exploitation.
Q5Is exploitation threshold high? (Auth/Config)
โก **Threshold**: **LOW**. Remote exploitation via malicious PDF/JS. No authentication required. Just need the victim to open the crafted file in an unpatched browser.
Q6Is there a public Exp? (PoC/Wild Exploitation)
๐ **Public Exploit**: **YES**. GitHub repo `vincd/CVE-2015-4495` exists. ๐ **Method**: Simple Python HTTP server + crafted JS triggers a popup with root directory content (`/`).
Q7How to self-check? (Features/Scanning)
๐ **Self-Check**: Verify Firefox version. If **< 39.0.3**, you are vulnerable. ๐ **Scan**: Look for unpatched Firefox instances serving or viewing PDFs. Check for the specific JS trigger in network logs.
Q8Is it fixed officially? (Patch/Mitigation)
โ **Fixed**: **YES**. Patched in **Firefox 39.0.3**. ๐ข **Advisory**: mfsa2015-78. Red Hat (RHSA-2015:1581) and SUSE also issued updates.
Q9What if no patch? (Workaround)
๐ง **No Patch Workaround**: Disable JavaScript in PDF viewers. ๐ซ **Mitigation**: Do not open untrusted PDFs. Update browser immediately. Use sandboxed environments for viewing documents.
Q10Is it urgent? (Priority Suggestion)
๐ฅ **Urgency**: **HIGH**. Remote code execution/file read risk. Public PoC exists. ๐ **Action**: Patch immediately to version 39.0.3 or later. Critical for enterprise deployments.