CVE-2018-6832 in C1 Lite
Summary
by MITRE
Stack-based buffer overflow in the getSWFlag function in Foscam Cameras C1 Lite V3, and C1 V3 with firmware 2.82.2.33 and earlier, FI9800P V3, FI9803P V4, FI9851P V3, and FI9853EP V2 2.84.2.33 and earlier, FI9816P V3, FI9821EP V2, FI9821P V3, FI9826P V3, and FI9831P V3 2.81.2.33 and earlier, C1, C1 V2, C1 Lite, and C1 Lite V2 2.52.2.47 and earlier, FI9800P, FI9800P V2, FI9803P V2, FI9803P V3, and FI9851P V2 2.54.2.47 and earlier, FI9815P, FI9815P V2, FI9816P, and FI9816P V2, 2.51.2.47 and earlier, R2 and R4 2.71.1.59 and earlier, C2 and FI9961EP 2.72.1.59 and earlier, FI9900EP, FI9900P, and FI9901EP 2.74.1.59 and earlier, FI9928P 2.74.1.58 and earlier, FI9803EP and FI9853EP 2.22.2.31 and earlier, FI9803P and FI9851P 2.24.2.31 and earlier, FI9821P V2, FI9826P V2, FI9831P V2, and FI9821EP 2.21.2.31 and earlier, FI9821W V2, FI9831W, FI9826W, FI9821P, FI9831P, and FI9826P 2.11.1.120 and earlier, FI9818W V2 2.13.2.120 and earlier, FI9805W, FI9804W, FI9804P, FI9805E, and FI9805P 2.14.1.120 and earlier, FI9828P, and FI9828W 2.13.1.120 and earlier, and FI9828P V2 2.11.1.133 and earlier allows remote attackers to cause a denial of service (crash and reboot), via the callbackJson parameter.
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Analysis
by VulDB Data Team • 03/03/2020
This vulnerability represents a critical stack-based buffer overflow condition that affects numerous Foscam IP camera models across multiple firmware versions. The flaw exists within the getSWFlag function, which processes the callbackJson parameter in the camera's web interface. When an attacker sends a specially crafted payload through this parameter, the function fails to properly validate input length, allowing malicious data to overwrite adjacent memory locations on the stack. This fundamental security weakness stems from inadequate bounds checking and improper memory management practices that are commonly associated with CWE-121 stack-based buffer overflow vulnerabilities.
The operational impact of this vulnerability extends beyond simple denial of service to potentially enable more sophisticated attack vectors. Remote attackers can exploit this weakness to cause cameras to crash and reboot repeatedly, effectively rendering the surveillance system unavailable during critical periods. The persistent nature of these crashes can lead to significant operational disruptions in security monitoring environments where continuous camera operation is essential. From an attack framework perspective, this vulnerability aligns with ATT&CK technique T1499.004 for network denial of service and could serve as a precursor for more advanced exploitation attempts targeting the device's underlying operating system or firmware components.
The affected device ecosystem encompasses a broad range of Foscam models including various C1, FI9800P, FI9803P, FI9851P, FI9816P, and other series across multiple firmware revisions. The widespread nature of this vulnerability across different hardware generations indicates a systemic issue in the software development lifecycle of these devices, particularly in how input validation is implemented across the web interface components. The vulnerability's presence in firmware versions dating back several years suggests that manufacturers may have failed to properly address this class of memory corruption issues during their security testing phases. Organizations should consider implementing network segmentation to isolate affected devices and deploy firmware updates as soon as vendor patches become available, while also monitoring for potential exploitation attempts through network intrusion detection systems that can identify malformed callbackJson parameter traffic.