CVE-2022-37779 in FIR151B A2
Summary
by MITRE • 09/08/2022
Phicomm FIR151B A2, FIR302E A2, FIR300B A2, FIR303B A2 routers V3.0.1.17 were discovered to contain a remote command execution (RCE) vulnerability via the sendnum parameter of the ping function.
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Analysis
by VulDB Data Team • 10/14/2022
This vulnerability affects Phicomm routers including models FIR151B A2, FIR302E A2, FIR300B A2, and FIR303B A2 running firmware version V3.0.1.17. The issue stems from improper input validation within the ping function implementation, specifically targeting the sendnum parameter that controls the number of ping packets sent. This flaw allows remote attackers to execute arbitrary commands on the affected devices without authentication, representing a critical security risk that aligns with CWE-77 and CWE-94 categories.
The technical exploitation occurs through manipulation of the sendnum parameter in the ping function, which fails to properly sanitize user input before processing. This inadequate validation creates a command injection vulnerability where malicious payloads can be injected into the system command execution pipeline. Attackers can leverage this weakness to gain unauthorized access to the router's underlying operating system, potentially leading to complete device compromise. The vulnerability demonstrates characteristics consistent with the ATT&CK framework's T1059.001 technique for command and scripting interpreter, specifically targeting the Windows Command Shell or similar system interfaces.
Operationally, this RCE vulnerability poses significant risks to network security infrastructure as it enables attackers to remotely control affected routers. Successful exploitation could allow threat actors to redirect traffic, install malware, modify network configurations, or use the compromised devices as entry points for broader network attacks. The impact extends beyond individual device compromise to potentially affect entire network segments that rely on these routers for connectivity. Organizations using these specific router models should consider the vulnerability as a high-priority threat requiring immediate attention.
Mitigation strategies should focus on immediate firmware updates from Phicomm to address the command injection flaw, along with network segmentation to limit the attack surface. Network administrators should implement monitoring for suspicious ping activity and parameter manipulation attempts. Additional protective measures include disabling unnecessary remote management features, implementing strong access controls, and conducting comprehensive network assessments to identify potentially compromised devices. The vulnerability highlights the importance of proper input validation and output encoding practices in network device firmware development, aligning with security best practices outlined in NIST SP 800-53 and OWASP Top Ten categories.