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Q1What is this vulnerability? (Essence + Consequences)
๐จ **Essence**: EasyFTP Server suffers from a **Stack Buffer Overflow** in the **CWD command**. <br>๐ฅ **Consequences**: Attackers can execute **arbitrary code** on the target system.โฆ
๐ก๏ธ **Root Cause**: **CWE-121** (Stack-based Buffer Overflow). <br>๐ **Flaw**: The server fails to **verify input length** when processing the **CWD (Change Working Directory)** command.โฆ
๐ฆ **Affected**: **EasyFTP Server** by **KMiNT21 Software**. <br>๐ **Versions**: Version **1.7.0.11** and all **earlier versions** are vulnerable. Newer versions may be safe.
Q4What can hackers do? (Privileges/Data)
๐ **Attacker Capabilities**: Full **Remote Code Execution (RCE)**. <br>๐ **Privileges**: The attacker can run commands with the **same privileges** as the FTP service account.โฆ
๐ฅ **Public Exploits**: **YES**. <br>๐ **Resources**: Multiple exploits exist on **Exploit-DB** (IDs: 16737, 11668, 14402) and in **Metasploit Framework**. Wild exploitation is highly likely.
Q7How to self-check? (Features/Scanning)
๐ **Self-Check**: Scan for **EasyFTP Server** banners. <br>๐ก **Testing**: Send a **long string** in the **CWD command** to trigger a crash or overflow.โฆ
๐ ๏ธ **Official Fix**: **YES**. <br>๐ **Mitigation**: Upgrade to a version **newer than 1.7.0.11**. The vendor has released patches that validate input length properly.
Q9What if no patch? (Workaround)
๐ง **No Patch?**: **Workarounds**. <br>๐ **Actions**: Disable the **CWD command** if possible. Restrict FTP access via **Firewall/WAF**. Use **chroot jails** to limit damage. Monitor logs for abnormal buffer sizes.
Q10Is it urgent? (Priority Suggestion)
๐จ **Urgency**: **CRITICAL**. <br>โณ **Priority**: **Immediate Action Required**. <br>๐ข **Reason**: Public exploits exist, it allows **RCE**, and it affects a widely used legacy FTP server.โฆ