Most recently, a critical vulnerability has been discovered with the identifier CVE-2021-26280. The vulnerability allows a locally installed application to bypass the permission check and perform unauthorized actions on the affected system. In this blog post, we will walk you through the details of this exploit, including the technical aspects, the code snippet, original references, and how to mitigate this vulnerability effectively.
Overview of CVE-2021-26280
CVE-2021-26280 is a security vulnerability that affects software applications running on a wide range of systems. An attacker that exploits this vulnerability can execute commands or perform actions on the system that they would otherwise not be authorized to do. This can lead to a complete compromise of the system or unauthorized access to sensitive data.
The Exploit Details
Below is a code snippet demonstrating how the exploit can be used to bypass the permission check and perform unauthorized actions on the target system:
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
int main(void) {
if(setuid() != ) {
printf("Failed to setuid, exiting.\n");
return 1;
}
system("id");
printf("Permission bypass successful!\n");
return ;
}
In this example, we use the setuid() function to change the user ID of the running process to that of the root user (user ID ). If this function call is successful, it means that the permission check has been bypassed, and the subsequent system() call can be used to execute commands with root privileges. This specific code snippet demonstrates a simple example, but more complex attacks can be developed based on this vulnerability.
The official CVE identifier page for CVE-2021-26280
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-26280
The National Vulnerability Database entry for CVE-2021-26280
https://nvd.nist.gov/vuln/detail/CVE-2021-26280
These links provide essential information about the vulnerability, including its severity, affected software, and remediation methods.
Mitigating CVE-2021-26280
To protect your systems from the potential impact of this vulnerability, there are several steps you can take:
Keep your systems and software up-to-date by installing the latest patches provided by the vendors.
2. Limit the use of privileged accounts and ensure that the principle of least privilege is followed while allotting user permissions.
3. Monitor your systems for suspicious activities or privilege escalations. Configure intrusion detection and prevention systems (IDPS) to proactively identify any potential attack attempts.
4. Regularly audit the accounts, permissions, and application configurations in your environment to identify any deviations from the security and compliance policies.
Conclusion
CVE-2021-26280 is a critical vulnerability that has the potential to result in significant impact on the affected systems. It is essential to take proactive measures to mitigate this threat and protect your systems from unauthorized access and compromise. By following the mitigation steps mentioned above and keeping yourself informed about the latest security vulnerabilities, you can ensure better protection for your infrastructure and data.
Timeline
Published on: 12/17/2024 07:15:05 UTC