CVE-2017-2877

Executive Summary

CVE-2017-2877 affects the Foscam C1 Indoor HD Camera running application firmware 2.52.2.43. A missing error check in the Multi-Camera interface on port 10001 permits an unauthenticated attacker to reset user accounts to factory defaults via a specially crafted request. The vulnerability carries a CVSS score of 9.8, indicating critical severity due to network exposure without authentication requirements. Enterprise security teams should treat exposed Foscam devices as high-risk assets capable of immediate account compromise.

Technical Analysis

The vulnerability stems from a missing error check within the Multi-Camera interface of the specified firmware. The NVD description identifies that this flaw resides on port 10001 and can be triggered by a specially crafted request. No authentication is required, allowing direct interaction with the interface that manages user accounts. The attack surface is limited to the network-exposed port and the Multi-Camera functionality; the absence of proper error validation permits the request to proceed to an account reset operation. Because the description provides no additional code paths, function names, or request formats, the mechanism is characterized strictly at the class level as an unchecked condition enabling unauthorized state change to factory defaults.

Exploitation Scenarios

No public PoC available; attack chain is inferred from vulnerability class.

1. Reconnaissance/target identification: Attackers scan for devices exposing port 10001 associated with Foscam C1 cameras running firmware 2.52.2.43.
2. How the specific flaw class is triggered: A request is sent to the Multi-Camera interface on port 10001 that omits expected error-handling validation.
3. Payload/execution method at the vulnerability-class level: The specially crafted request exploits the missing error check, causing the interface to process an account reset command without authentication.
4. Post-exploitation impact: User accounts are reset to factory defaults, removing existing credentials and granting the attacker potential follow-on access through default configurations.

Impact Assessment

Successful exploitation resets camera user accounts to factory defaults, enabling unauthorized access and potential camera takeover. The CVSS 9.8 score reflects full network attack vector, low complexity, no privileges or user interaction required, and high impact on confidentiality, integrity, and availability. Affected systems are limited to Foscam C1 devices on firmware 2.52.2.43; blast radius includes loss of camera control and possible use as an entry point into connected networks. No CISA KEV listing exists, and no in-the-wild campaigns are documented in provided data.

Detection Guidance

Sigma Rule

title: Foscam Multi-Camera Interface Account Reset Attempt
id: foscam-2017-2877-001
status: experimental
description: Detects unauthenticated requests to port 10001 targeting Foscam Multi-Camera interface
logsource:
  category: network
  product: firewall
detection:
  selection:
    dst_port: 10001
    event_type: connection
  condition: selection
fields:
  - src_ip
  - dst_ip
falsepositives:
  - Legitimate camera management traffic
level: high

YARA Rule

rule Foscam_CVE_2017_2877_Account_Reset {
    meta:
        description = "Detects patterns associated with CVE-2017-2877 on Foscam port 10001"
        author = "valtersit.com"
        date = "2024-10-01"
    strings:
        $port = "10001"
        $foscam = "Foscam C1"
        $multi = "Multi-Camera"
    condition:
        $port and $foscam and $multi
}

Suricata IDS Rule

alert tcp any any -> any 10001 (msg:"Foscam CVE-2017-2877 Multi-Camera Account Reset Attempt"; flow:to_server,established; content:"Multi-Camera"; nocase; sid:20172877; rev:1;)

Elastic Detection

network where destination.port == 10001 and
network.protocol == "tcp" and
event.action == "connection_attempt" and
host.name like "*Foscam*"

Splunk SPL Query

index=firewall OR index=network 
dest_port=10001 
| search "Foscam" OR "Multi-Camera" 
| stats count by src_ip, dest_ip, _time 
| where count > 5

Wazuh OSSEC Rule

<group name="foscam,">
  <rule id="100100" level="12">
    <if_sid>100001</if_sid>
    <match>10001</match>
    <description>Possible CVE-2017-2877 exploitation on Foscam Multi-Camera interface</description>
    <group>pci_dss_11.4,gpg13_4.12,</group>
  </rule>
</group>

Mitigation & Patch Guidance

Patch confidence: 0/4 (UNPATCHED — no patch evidence from any tracked source).

1. Immediate mitigations: Block inbound access to port 10001 at network perimeters and disable the Multi-Camera interface if unused.
2. Patch/upgrade steps: No vendor fix is available; monitor firmware updates from Foscam and apply any future releases that address error handling in the Multi-Camera interface.
3. Long-term hardening: Restrict camera management to isolated VLANs, enforce strong default credential changes, and implement network segmentation for all IoT devices.

References

• https://nvd.nist.gov/vuln/detail/CVE-2017-2877
• Foscam firmware release notes (no advisory published for this CVE)
• MITRE ATT&CK T1190 — Exploit Public-Facing Application
• EPSS data: 0.01902 (77.7th percentile)
• No known threat actor campaigns or exploit-in-the-wild evidence documented.