CVE-2016-1000254: Linux TCP Stack Integer Overflow DoS Analysis & PoC

CVE-2016-1000254 Vulnerability Summary Vulnerability Overview This vulnerability exists in the kernel/git/net-next-2.6/net/ipv4/tcp_input.c file, specifically within the function. An attacker can craft malicious TCP packets to trigger an integer overflow or a NULL pointer dereference in the kernel, leading to a Denial of Service (DoS) attack. The core of the vulnerability lies in a flaw in the logic handling TCP options. When processing certain malformed options, insufficient boundary checks are performed, resulting in out-of-bounds memory access or calculation errors. --- Scope of Impact Affected Component: Linux Kernel Network Stack (IPv4 TCP Input Processing) Affected Versions: This vulnerability exists in the branch. The specific scope of impact depends on the distribution's kernel version (typically affecting the 2.6.x series and some subsequent versions until the fix commit is merged). Trigger Condition: Receiving packets containing maliciously crafted TCP options. --- Remediation Based on the screenshot content, the remediation strategy is: > Add strict validation for TCP option length within the function to prevent integer overflow and illegal memory access. The specific code snippet for the fix is as follows (extracted from the screenshot): Additionally, the fix involves enhancements to the function to ensure that length validation is performed before parsing all options. --- POC / Exploit Code (Full Extraction) The screenshot includes a PoC script used to trigger this vulnerability (located in ). The complete code is below: > ⚠️ Note: This PoC is for testing and vulnerability verification only. Actual usage requires root privileges and must be executed in a controlled environment. --- Additional Information CVSS Score: 7.5 (High) Attack Vector: Network (Remote) Authentication Requirements: None Impact Type: Denial of Service (DoS) It is recommended that all systems running affected kernel versions be immediately upgraded to the patched version or apply the official security patch.

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CVE-2016-1000254: Linux TCP Stack Integer Overflow DoS Analysis & PoC