CVE-2021-39615 : What You Need to Know
Learn about CVE-2021-39615, a vulnerability in D-Link DSR-500N version 1.02 allowing unauthorized access to the embedded Linux system. Find mitigation steps and impact details here.
This CVE-2021-39615 article provides insights into a vulnerability found in D-Link DSR-500N version 1.02, allowing unauthorized access to the embedded Linux operating system due to hard-coded credentials.
Understanding CVE-2021-39615
CVE-2021-39615 is a vulnerability in D-Link DSR-500N version 1.02 that exposes hard-coded credentials, enabling attackers to gain unauthorized access.
What is CVE-2021-39615?
The vulnerability in D-Link DSR-500N version 1.02 allows unauthorized users to access the embedded Linux operating system due to hard-coded credentials in the '/etc/passwd' file.
The Impact of CVE-2021-39615
The vulnerability poses a high risk to confidentiality, integrity, and availability with low attack complexity, impacting unsupported products.
Technical Details of CVE-2021-39615
This section delves into the specific technical aspects of the CVE-2021-39615 vulnerability.
Vulnerability Description
- D-Link DSR-500N version 1.02 contains hard-coded credentials for undocumented user accounts in the '/etc/passwd' file.
- Attackers gaining access to cleartext passwords can log in via SSH or Telnet, compromising the device's Linux operating system.
Affected Systems and Versions
- Product: D-Link DSR-500N version 1.02.
- Vendor: D-Link.
- Versions: All versions up to 1.02.
Exploitation Mechanism
The attacker needs to recover the cleartext password from the identified hash value to gain access to the embedded Linux operating system.
Mitigation and Prevention
In this section, strategies to mitigate and prevent the exploitation of CVE-2021-39615 are discussed.
Immediate Steps to Take
- Upgrade to version 2.12/2 to eliminate the hard-coded credentials vulnerability.
- Regularly monitor security bulletins from D-Link for updates.
Long-Term Security Practices
- Avoid using default credentials on devices.
- Implement strong password policies and multifactor authentication.
- Conduct regular security assessments and audits.
Patching and Updates
- Apply security patches promptly.
- Keep firmware and software up to date.