CVE-2021-29379 : Exploit Details and Defense Strategies
Discover the critical CVE-2021-29379 affecting D-Link DIR-802 A1 devices. Learn about the command injection vulnerability through UPnP, its impact, and mitigation steps.
D-Link DIR-802 A1 devices through version 1.00b05 are prone to a critical vulnerability that enables command injection via the Search Target field of the SSDP M-SEARCH discover packet. This issue arises due to Universal Plug and Play (UPnP) being enabled by default on port 1900.
Understanding CVE-2021-29379
This section will delve into the details regarding the vulnerability and its implications.
What is CVE-2021-29379?
The vulnerability found in D-Link DIR-802 A1 devices allows an attacker to execute arbitrary commands by inserting malicious payloads into specific network packets. Notably, only devices that are no longer supported by the maintainer are affected.
The Impact of CVE-2021-29379
Exploitation of this vulnerability can lead to unauthorized access, data theft, and potential takeover of the affected networking equipment, posing a severe security risk.
Technical Details of CVE-2021-29379
In this section, we will explore the technical aspects of the vulnerability.
Vulnerability Description
The flaw permits threat actors to inject commands via the UPnP service, compromising the device's integrity and confidentiality.
Affected Systems and Versions
D-Link DIR-802 A1 devices up to version 1.00b05 are confirmed to be susceptible to this vulnerability.
Exploitation Mechanism
By manipulating the Search Target field in the SSDP M-SEARCH packet, attackers can remotely execute commands on the targeted device.
Mitigation and Prevention
This section provides guidance on mitigating the risks associated with CVE-2021-29379.
Immediate Steps to Take
Disable UPnP on the affected devices and segregate them from the internet to prevent potential exploitation until a patch is available.
Long-Term Security Practices
Regularly update device firmware, apply security configurations, and conduct security audits to enhance resilience against possible threats.
Patching and Updates
Keep track of security advisories from D-Link and implement patches promptly to address the vulnerability and safeguard the devices.