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Q1What is this vulnerability? (Essence + Consequences)
🚨 **Essence**: A critical buffer overflow in Zephyr RTOS (v4.3.0 & earlier). <br>💥 **Consequences**: Improper handling of tail space in `dns_unpack_name` leads to **out-of-bounds write**.…
🛡️ **CWE**: CWE-787 (Out-of-bounds Write). <br>🔍 **Flaw**: The `dns_unpack_name` function fails to properly allocate or check buffer boundaries for the tail space during DNS name unpacking.…
📦 **Vendor**: ZephyrProject-RTOS. <br>📱 **Product**: Zephyr RTOS. <br>⚠️ **Affected**: Versions **4.3.0 and earlier**. Any IoT device using this RTOS version with DNS features active is at risk.
Q4What can hackers do? (Privileges/Data)
🕵️ **Privileges**: High. The CVSS indicates **High Integrity (I:H)** and **High Availability (A:H)** impact.…
🚫 **Public Exploit**: No. The `pocs` field is empty. <br>📉 **Status**: While no public PoC exists yet, the low complexity (AC:L) and network accessibility make it a high-value target for future exploitation.…
🔍 **Self-Check**: <br>1. Check your Zephyr version (`git describe`). <br>2. Verify if `CONFIG_DNS_RESOLVER=y` is set in your Kconfig. <br>3. If both are true, you are vulnerable.…
✅ **Fix**: Yes. Refer to the official advisory: [GHSA-536f-h63g-hj42](https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-536f-h63g-hj42).…
🔥 **Urgency**: **CRITICAL**. <br>📅 **Priority**: Immediate action required. With CVSS indicating High Impact and Low Attack Complexity, this is a prime candidate for automated attacks.…