CVE-2022-39274 : Exploit Details and Defense Strategies

A buffer overflow vulnerability in

ProcessRadioRxDone

in LoRaMac-node could allow an attacker to execute arbitrary code or cause a denial of service (DoS) attack.

Understanding CVE-2022-39274

LoRaMac-node, a LoRa network node reference implementation, is affected by a buffer overflow vulnerability in versions prior to 4.7.0.

What is CVE-2022-39274?

The vulnerability arises due to improper size validation of incoming radio frames, leading to an out-of-bounds write that can be exploited by an attacker to gain control over the execution or cause a DoS by corrupting data sections.

The Impact of CVE-2022-39274

The buffer overflow vulnerability poses a high severity risk with a CVSS base score of 7.5. Attackers can potentially execute arbitrary code, manipulate user data, and disrupt system availability.

Technical Details of CVE-2022-39274

Vulnerability Description

The vulnerability occurs in the function

ProcessRadioRxDone

of LoRaMac-node. An attacker can craft a specific FRAME_TYPE_PROPRIETARY frame to trigger a 65280-byte out-of-bounds memcopy, leading to potential DoS or control over the execution.

Affected Systems and Versions

Only versions of LoRaMac-node prior to 4.7.0 are affected by this vulnerability.

Exploitation Mechanism

By exploiting the lack of size validation in incoming radio frames, an attacker can trigger the buffer overflow and execute malicious code.

Mitigation and Prevention

Immediate Steps to Take

Users are strongly advised to upgrade to version 4.7.0 of LoRaMac-node to mitigate the vulnerability. Alternatively, they can apply the patch commit

e851b079

manually.

Long-Term Security Practices

Regularly updating software packages and implementing secure coding practices can help prevent buffer overflow vulnerabilities.

Patching and Updates

Ensure timely installation of security patches and updates to safeguard systems against known vulnerabilities.