Threat Intelligence Report: CVE-2017-2832

Executive Summary

CVE-2017-2832 is an exploitable command injection vulnerability in the web management interface of the Foscam C1 Indoor HD Camera running application firmware 2.52.2.37. A specially crafted HTTP request allows an authenticated user to inject arbitrary shell characters during a password change operation, resulting in arbitrary command execution on the device. With a CVSS score of 8.8, successful exploitation grants the attacker full control of the affected camera, which can be leveraged for surveillance interception, lateral movement within the network, or inclusion in botnet operations. The vulnerability remains unpatched according to tracked sources, making affected devices persistently vulnerable.

Technical Analysis

The vulnerability resides in the web management interface of the Foscam C1 Indoor HD Camera firmware version 2.52.2.37. According to the NVD description, the flaw is triggered during a password change operation, where user-supplied input is not properly sanitized before being used in a system-level command.

Vulnerability Class: Command Injection (CWE-77)

Attack Mechanism: The web management interface accepts an HTTP request to change the device password. The input fields within this request are concatenated into an underlying system command without adequate sanitization or escaping. By inserting shell metacharacters (e.g., ;, &&, |, backticks, $()), an attacker can terminate the intended command and execute arbitrary shell commands on the underlying operating system.

Attack Surface: The web management interface is exposed on the device's network interface, typically listening on standard HTTP ports (80 or 8080). The interface is used for local configuration via browser access and is frequently enabled by default.

Technical Detail Caveat: The NVD description does not specify the exact parameter name, endpoint path, or the underlying shell command structure involved. The injection point is confirmed to exist within the password change functionality, but specific implementation details (function names, exact parameters) are not disclosed in the available data. The attack vector is network-based, requiring only a single crafted HTTP request to trigger the vulnerability.

Authentication Requirement: The CVSS vector implies a low-privilege requirement (PR:L), suggesting that at least basic authentication (e.g., the default administrator credentials) is needed to access the password change functionality. However, given that many Foscam devices ship with default credentials ("admin"/empty password) and users frequently do not change them, this barrier is commonly trivial to bypass.

Exploitation Scenarios

Step 1: Target Identification

Attackers identify Foscam C1 cameras exposed to the internet using Shodan or similar scanning tools. Queries for "Foscam C1" or known device HTTP banners reveal exposed devices. Alternatively, attackers on the same LAN can scan for Foscam default ports.

Step 2: Authentication Bypass / Credential Access

The attacker attempts to authenticate to the device's web management interface. Many Foscam devices are still configured with default credentials ("admin" with an empty password or "admin"/"admin"). If authentication is required and not bypassed, the attacker uses default or brute-forced credentials. Since the CVSS vector indicates low privilege requirement, the attacker must have any valid session — which is frequently achievable with default credentials.

Step 3: Command Injection Trigger

The attacker navigates to the password change functionality within the web interface. A specially crafted HTTP request is constructed where the new password field (or a related parameter) contains shell metacharacters followed by an arbitrary command. For example, the payload might appear as:

newpass=test;reboot&confirm=test

The web application concatenates the unsanitized input into a system command such as (inferred, not confirmed):

echo "newpassword" > /etc/passwd...

The injected shell metacharacters terminate the intended command and execute the attacker's appended command (reboot in the example above).

Step 4: Post-Exploitation

Successful command injection results in execution of arbitrary commands with the privileges of the web server process (likely root). The attacker can:

• Download and execute malware (e.g., Mirai variant for DDoS botnet participation)
• Exfiltrate configuration data, Wi-Fi credentials stored on the device
• Modify device firmware settings
• Use the device as a pivot point for lateral movement into the internal network
• Disable or re-enable camera features for stealth surveillance

Note on Public Exploit: No public PoC code or exploit module for CVE-2017-2832 has been confirmed in the provided data. The attack chain described above is inferred from the vulnerability class (command injection) and the NVD description's statement that a single HTTP request triggers the flaw.

Impact Assessment

CVSS Sub-scores: The CVSS score of 8.8 (High) reflects the following: Network attack vector (AV:N), low attack complexity (AC:L), low privilege requirement (PR:L), no user interaction (UI:N), and a scope change (S:U) due to the fact the compromised component (web interface) leads to compromise of the entire device OS. Confidentiality, Integrity, and Availability impacts are all rated High (C:H/I:H/A:H), meaning an attacker can fully read device data, modify system state, and disrupt operations.

Business Impact:

• Privacy Breach: Compromised cameras can be used to surveil homes, offices, or facilities, exposing sensitive visual information.
• Network Compromise: An exploited camera can serve as an entry point into the internal network, enabling lateral movement to more critical systems.
• Botnet Recruitment: Unpatched IoT devices are frequently enslaved into DDoS botnets; this camera is a prime candidate for Mirai-style malware.
• Regulatory Risk: For enterprises in regulated sectors, an unpatched known-vulnerable device may constitute a compliance violation.

Affected Systems: Foscam C1 Indoor HD Camera with application firmware 2.52.2.37. Other Foscam models or firmware versions may share the same vulnerable code path but have not been confirmed in the available data. The lack of patch information for this long-standing vulnerability suggests that all devices still running 2.52.2.37 (or earlier) are potentially affected.

Blast Radius: Any Foscam C1 camera on firmware 2.52.2.37 that is reachable via the network is at risk. Given that many such devices remain internet-facing without default credential changes, the realistic exploitability is high despite the low-privilege authentication requirement.

Detection Guidance

Detection Rationale: Since the vulnerability is triggered via HTTP requests to the web management interface, network-level detection can focus on anomalous HTTP request patterns. Host-level detection on logs (if the device generates any) and authentication attempts provide additional coverage.

Sigma Rule

title: Foscam C1 Command Injection Attempt in Password Change
id: 9f3a4b2c-5d6e-4f7a-8b9c-0d1e2f3a4b5c
status: experimental
description: Detects HTTP requests targeting Foscam C1 password change endpoint with shell metacharacters
references:
    - https://nvd.nist.gov/vuln/detail/CVE-2017-2832
tags:
    - attack.execution
    - attack.t1203
    - cve.2017.2832
logsource:
    category: webserver
    product: apache
    definition: Requires web server access logs that capture URI and request body
detection:
    selection_method:
        cs-method: POST
    selection_path:
        cs-uri-query|contains:
            - 'password'
            - 'passwd'
            - 'change_pass'
    selection_payload:
        cs-body|contains:
            - ';'
            - '&&'
            - '|'
            - '`'
            - '$('
            - '$(cmd)'
    condition: selection_method and selection_path and selection_payload
falsepositives:
    - Legitimate password changes that contain special characters in the new password (unlikely but possible)
level: high

YARA Rule

rule Foscam_C1_Command_Injection_CVE_2017_2832
{
    meta:
        author = "Valtersit Threat Intel"
        description = "Detects HTTP request payloads attempting to exploit CVE-2017-2832 command injection in Foscam C1 camera"
        cve = "CVE-2017-2832"
        date = "2024-04-15"
        severity = "high"
    strings:
        $a = "password" ascii wide nocase
        $b = "passwd" ascii wide nocase
        $c = "reboot" ascii wide nocase
        $d = "wget" ascii wide nocase
        $e = "curl" ascii wide nocase
        $f = ";" ascii
        $g = "&&" ascii
        $h = "|" ascii
        $i = "`" ascii
        $j = "$(" ascii
    condition:
        uint16(0) == 0x0D0A and  // Check for HTTP-like start
        any of ($a, $b) and
        any of ($f, $g, $h, $i, $j) and
        (any of ($c, $d, $e) or #f > 2 or #j > 1)
}

Note: This YARA rule targets network traffic captures and HTTP payloads. It will potentially match benign traffic containing shell characters in password fields, so tuning based on the specific devices in your environment is recommended.

Suricata IDS Rule

alert http any any -> any any (msg:"ET EXPLOIT Foscam C1 Command Injection Attempt (CVE-2017-2832)"; flow:established,to_server; content:"POST"; http_method; content:"password"; http_uri; nocase; pcre:"/(;|\|\||\||`|\$\().{0,50}(reboot|wget|curl|nc|cat|ls|sh|bash|id|whoami)/iR"; classtype:attempted-admin; sid:20272832; rev:1; metadata:cve,CVE-2017-2832;)

Elastic Detection (EQL)

sequence by source.ip
  [ network where network.protocol == "http" and
    http.request.method == "POST" and
    http.request.uri.text like "*password*" and
    (http.request.body.content like "*;*" or
     http.request.body.content like "*&&*" or
     http.request.body.content like "*|*" or
     http.request.body.content like "*`*" or
     http.request.body.content like "*$(*")
  ]

Splunk SPL Query

index=web earliest=-7d sourcetype=apache:access
| search "/password" AND method=POST
| regex _raw="(;|&&|\||`|\$\().{0,80}(reboot|wget|curl|nc|cat|ls|id|whoami|sh|bash)"
| table _time, src_ip, dest_ip, uri_path, http_user_agent
| stats count by src_ip, dest_ip, uri_path
| sort -count

Wazuh OSSEC Rule

<group name="foscam_command_injection,">
  <rule id="100385" level="12">
    <decoded_as>web-access</decoded_as>
    <field name="method">POST</field>
    <field name="url">\.*password.*</field>
    <match>;</match>
    <match>&amp;&amp;</match>
    <match>|</match>
    <description>Possible Foscam C1 command injection attempt (CVE-2017-2832) from $(srcip) to $(dstip)</description>
    <group>attack_execution,</group>
    <mitre>
      <id>T1203</id>
    </mitre>
  </rule>
</group>

Mitigation & Patch Guidance

Patch Status: Patch confidence is 0/4 — no patch evidence from any tracked source. The vendor (Foscam) has not released a confirmed fix for CVE-2017-2832 in firmware 2.52.2.37. Devices remain unpatched and vulnerable.

Critical Advisory: Because no official patch is confirmed, the following guidance is the primary defensive strategy for affected devices.

1. Immediate Mitigations (Recommended Within 24 Hours):

• Disconnect from the Internet: If the camera does not require remote access, isolate it from external networks immediately.
• Network Segmentation: Place all IoT cameras on a separate VLAN with strict firewall rules that block inbound traffic from the internet and only allow necessary management traffic from trusted internal IPs.
• Change Default Credentials: If the device is still accessible, immediately change the administrator password to a strong, unique value. While authentication does not prevent exploitation entirely, it raises the attacker's barrier.
• Disable Remote Management: Turn off UPnP port forwarding and any "cloud" remote access features that expose the web interface to the internet.
• Firewall Rule: Block inbound HTTP/HTTPS access to the camera from untrusted networks at the perimeter firewall.

2. Patch/Upgrade Steps:

• Check for Firmware Updates: Despite the lack of tracked patched versions, periodically check Foscam's official support website and the device's firmware update mechanism for any new releases. If a version newer than 2.52.2.37 is available, review the release notes for security fixes and test in a staging environment before deployment.
• Vendor Contact: Contact Foscam support directly to inquire about the status of a security fix for CVE-2017-2832. Document the response for your compliance records.
• Consider Device Replacement: If no firmware update is available and the device is critical to operations, consider replacing it with a model from a vendor with a demonstrated security patch cadence, or a device that is no longer affected by this vulnerability class.

3. Long-Term Hardening:

• Continuous Monitoring: Deploy the detection rules provided above on network monitoring infrastructure and Web Application Firewalls (WAF) placed in front of the camera management interface.
• Policy Enforced: Establish an enterprise policy that IoT devices (cameras, sensors) cannot be directly accessible from the internet and must be managed through a secure jump host.
• Inventory Management: Add all Foscam devices to your asset inventory with firmware version tagging to facilitate future patch auditing and vulnerability scanning.
• Regular Vulnerability Scanning: Include IoT device ranges in internal vulnerability scans; use tools that can identify CVE-2017-2832.
• Least Privilege: If the camera supports multiple user roles, disable any accounts not required for operation and enforce strong password policies.
• Network Access Control (NAC): Implement NAC to prevent unknown or vulnerable devices from connecting to the network.
• Incident Response Preparedness: Ensure that detection of any exploitation attempts (as per the detection rules) triggers an immediate incident response workflow, including device isolation and forensic capture.

Compensating Controls: Given the unpatched status, compensating controls are the primary defense. A Web Application Firewall (WAF) with virtual patching can be configured to block requests containing shell metacharacters in the applicable POST body parameters. IDS/IPS devices with custom signatures (as referenced in the Suricata rule above) should be deployed at network ingress points.

References

1. NVD Entry: CVE-2017-2832 Detail — Provides the official vulnerability description and CVSS metrics.

2. Talos Intelligence Advisory — Cisco Talos originally coordinated the disclosure of this vulnerability (TALOS-2017-0335 reference). The advisory provides technical analysis and proof-of-concept details for the research community. (Note: Specific advisory details are not fully reproduced here due to data limitations.)

3. Foscam Support Website: Foscam Downloads — Official source for firmware updates and security advisories (if any have been published).

4. CISA Known Exploited Vulnerabilities Catalog: CISA KEV — CVE-2017-2832 is NOT listed in the KEV as of this report; however, it is recommended to periodically verify this status as the catalog is updated.

5. Exploit-DB: Exploit Database — Search for CVE-2017-2832 to check for publicly disclosed exploit code; while none was confirmed in our data, this should be periodically re-checked.

Threat Actor Note: No confirmed threat actor campaigns or exploit-in-the-wild evidence for CVE-2017-2832 has been identified in the provided data. However, the pattern of exploitation for similar Foscam command injection vulnerabilities (e.g., Mirai botnet propagation) suggests IoT botnet operators may target this flaw. The EPSS score of 0.05763 and its 92.4% percentile ranking indicates a moderately high probability of exploitation in the wild.