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Q1What is this vulnerability? (Essence + Consequences)
๐จ **Essence**: A Privilege Escalation flaw in **Windows Mount Manager**. ๐ **Consequences**: Attackers can write malicious binaries to disk and execute them with **SYSTEM-level privileges**.โฆ
๐ **Root Cause**: Improper handling of **Symbolic Links** (Symlinks). ๐ **Flaw**: The Mount Manager component fails to validate paths correctly, allowing symlink attacks to redirect writes to protected system locations.โฆ
๐ฅ๏ธ **Affected Systems**: Microsoft Windows OS. ๐ **Specific Versions**:
- Windows Vista SP2
- Windows Server 2008 SP2 & R2 SP1
- Windows 7 SP1
- (And other versions listed in MS15-085).
โ ๏ธ **Threshold**: **Low/Medium**. ๐ No authentication required. โก Exploitation relies on **physical access** (plugging in a malicious USB) or triggering the mount process.โฆ
๐ **Public Exploit**: **YES**. ๐ A PoC is available on GitHub (int0/CVE-2015-1769). ๐ It uses a **VHD file** to reproduce the issue. The PoC demonstrates how symbolic links are created to trigger the vulnerability.
Q7How to self-check? (Features/Scanning)
๐ **Self-Check**:
1. Check Windows version against affected list. ๐
2. Scan for **Mount Manager** components. ๐ ๏ธ
3. Look for **MS15-085** patch status. ๐ฉน
4.โฆ
๐ก๏ธ **Official Fix**: **YES**. โ Microsoft released **MS15-085** security update. ๐ Published: 2015-08-15. ๐ Apply the latest patches to resolve the symlink handling flaw.
Q9What if no patch? (Workaround)
๐ง **No Patch Workaround**:
1. **Disable AutoPlay** for USB devices. ๐ซ
2. Restrict physical access to machines. ๐
3. Monitor for unauthorized **VHD** mounting. ๐
4.โฆ
๐ฅ **Urgency**: **HIGH** (Historically). ๐ Although old (2015), unpatched legacy systems (Win 7/Server 2008) remain at risk. โก If still unpatched, prioritize immediately. ๐ For modern systems, ensure updates are current.