CVE-2017-8410 in DCS-1130
Summary
by MITRE
An issue was discovered on D-Link DCS-1100 and DCS-1130 devices. The binary rtspd in /sbin folder of the device handles all the rtsp connections received by the device. It seems that the binary performs a memcpy operation at address 0x00011E34 with the value sent in the "Authorization: Basic" RTSP header and stores it on the stack. The number of bytes to be copied are calculated based on the length of the string sent in the RTSP header by the client. As a result, memcpy copies more data then it can hold on stack and this results in corrupting the registers for the caller function sub_F6CC which results in memory corruption. The severity of this attack is enlarged by the fact that the same value is then copied on the stack in the function 0x00011378 and this allows to overflow the buffer allocated and thus control the PC register which will result in arbitrary code execution on the device.
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Analysis
by VulDB Data Team • 10/15/2023
The vulnerability identified in CVE-2017-8410 affects D-Link DCS-1100 and DCS-1130 IP camera devices, representing a critical buffer overflow flaw in the rtspd binary responsible for handling RTSP connections. This vulnerability manifests through improper memory management during the processing of authorization headers, specifically targeting the memcpy operation at address 0x00011E34 within the device's firmware. The flaw occurs when the rtspd binary processes the "Authorization: Basic" RTSP header, where the number of bytes to be copied is determined by the length of the client-sent string, creating a classic stack-based buffer overflow condition.
The technical implementation of this vulnerability follows a multi-stage attack pattern that amplifies its impact significantly. The initial memcpy operation at 0x00011E34 copies data from the RTSP header into a stack buffer without proper bounds checking, allowing the copied data to exceed the allocated buffer space. This overflow corrupts the register state of the calling function sub_F6CC, effectively compromising the program's execution flow. The vulnerability is further exacerbated by a second memcpy operation at address 0x00011378 where the same data is copied again, creating a second buffer overflow condition that specifically targets the program counter register, enabling attackers to redirect execution flow.
This vulnerability directly maps to CWE-121 Stack-based Buffer Overflow, which is classified as a high-severity weakness in the Common Weakness Enumeration catalog, and represents a clear violation of secure coding practices for memory management. The attack vector aligns with ATT&CK technique T1203, where adversaries exploit memory corruption vulnerabilities to execute arbitrary code on target systems. The implications extend beyond simple privilege escalation, as the vulnerability allows for complete system compromise through a single malformed RTSP header request, making it particularly attractive to threat actors seeking persistent access to networked camera systems.
The operational impact of this vulnerability is severe, as it provides remote code execution capabilities without requiring authentication, given that the RTSP service is accessible over the network. Attackers can leverage this flaw to gain full control of the affected devices, potentially using them as entry points for broader network infiltration or to establish persistent backdoors. The vulnerability affects devices that are commonly deployed in security-critical environments such as surveillance systems, making the potential consequences particularly grave. Organizations should consider implementing network segmentation and access controls to limit exposure while awaiting vendor patches. The vulnerability also highlights the importance of firmware security auditing and proper input validation in embedded systems, particularly those handling network protocols with authentication mechanisms.