CVE-2022-25440 : What You Need to Know

Tenda AC9 v15.03.2.21 was discovered to contain a stack overflow vulnerability via the ntpserver parameter in the SetSysTimeCfg function.

Understanding CVE-2022-25440

This CVE identifies a security flaw in Tenda AC9 routers that could be exploited by attackers to trigger a stack overflow.

What is CVE-2022-25440?

The vulnerability in Tenda AC9 v15.03.2.21 allows for a stack overflow via the ntpserver parameter in the SetSysTimeCfg function, potentially leading to unauthorized access or denial of service.

The Impact of CVE-2022-25440

If exploited, this vulnerability could enable remote attackers to execute arbitrary code, compromise the device, or disrupt its normal operation, posing a significant security risk to users.

Technical Details of CVE-2022-25440

This section provides more insight into the specifics of the vulnerability.

Vulnerability Description

The vulnerability arises from improper input validation in the ntpserver parameter, leading to a stack overflow that could be abused by malicious actors.

Affected Systems and Versions

Tenda AC9 routers running version 15.03.2.21 are impacted by this vulnerability.

Exploitation Mechanism

By sending specially crafted requests to the ntpserver parameter in the SetSysTimeCfg function, attackers can overwhelm the device's stack memory, potentially gaining control or causing a system crash.

Mitigation and Prevention

It is crucial to take immediate steps to address and prevent exploitation of this vulnerability.

Immediate Steps to Take

Users should update their Tenda AC9 routers to a patched firmware version that addresses the stack overflow issue. Additionally, consider restricting network access to the device and monitoring for any suspicious activity.

Long-Term Security Practices

In the long term, ensure regular security assessments, keep devices up to date with the latest firmware releases, and follow security best practices to reduce the risk of future vulnerabilities.

Patching and Updates

Stay informed about security updates from Tenda and promptly apply patches to protect devices from known vulnerabilities like CVE-2022-25440.