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Q1What is this vulnerability? (Essence + Consequences)
๐จ **Essence**: Insecure Direct Object Reference (IDOR) in Telesquare SKT LTE Router SDT-CS3B1. <br>๐ฅ **Consequences**: Attackers can bypass authorization and access restricted resources.โฆ
๐ก๏ธ **Root Cause**: CWE-639 (Insecure Direct Object Reference). <br>๐ **Flaw**: The application exposes internal object references without proper access control checks, allowing direct manipulation.
Q3Who is affected? (Versions/Components)
๐ฆ **Affected**: Telesquare SKT LTE Router SDT-CS3B1. <br>๐ **Version**: Specifically Version **1.2.0**. <br>๐ **Vendor**: Telesquare (South Korea).
Q4What can hackers do? (Privileges/Data)
๐ต๏ธ **Hackers Can**: Bypass authentication/authorization. <br>๐ **Access**: Sensitive data and resources. <br>๐ **Privileges**: High risk of unauthorized control over the router and connected network.
Q5Is exploitation threshold high? (Auth/Config)
โก **Threshold**: **LOW**. <br>๐ **Auth**: PR:N (Privileges Required: None). <br>๐ **Access**: AV:N (Network), AC:L (Low Complexity). No user interaction needed.
Q6Is there a public Exp? (PoC/Wild Exploitation)
๐ฃ **Public Exploit**: **YES**. <br>๐ **Source**: Exploit-DB (ID: 43402). <br>๐ **Status**: Active PoC available, making exploitation easy for anyone.
Q7How to self-check? (Features/Scanning)
๐ **Self-Check**: Scan for Telesquare SDT-CS3B1 devices. <br>๐งช **Test**: Attempt to access internal API endpoints or resource IDs directly without valid session tokens.โฆ
๐ฉน **Official Fix**: Data does not list a specific patch date or version. <br>โ ๏ธ **Note**: Published date is listed as 2026-03-16 (Future/Delayed?), but advisory exists from 2017. Check vendor site for latest firmware.
Q9What if no patch? (Workaround)
๐ง **Workaround**: <br>1. **Isolate**: Move device to a segmented VLAN. <br>2. **Restrict**: Block external access to management ports. <br>3. **Monitor**: Watch for unusual API calls.
Q10Is it urgent? (Priority Suggestion)
๐ฅ **Urgency**: **CRITICAL**. <br>๐ **Priority**: High. <br>๐ **Reason**: CVSS 9.1 (Critical), No Auth Required, Public Exploit Exists. Patch immediately or isolate.