CVE-2021-27771 Explained : Impact and Mitigation
Learn about CVE-2021-27771 impacting HCL Sametime, allowing attackers to upload files, delete directories, and cause Denial of Service. Find mitigation steps and security best practices.
HCL Sametime is susceptible to a file transfer service vulnerability that could allow an attacker to modify the User SID, leading to Arbitrary File Upload, deletion of directories, and a Denial of Service attack when interacting with the Sametime chat application.
Understanding CVE-2021-27771
This CVE pertains to a security flaw in HCL Sametime that can be exploited by attackers to manipulate user session IDs and carry out malicious actions.
What is CVE-2021-27771?
The vulnerability in HCL Sametime allows for the unauthorized alteration of User SIDs, enabling attackers to perform tasks like Arbitrary File Uploads and directory deletion, potentially causing a Denial of Service.
The Impact of CVE-2021-27771
The impact of this CVE is rated as HIGH, with a base score of 8.2, signifying the severity of the vulnerability. The availability impact is significant as it can lead to a Denial of Service.
Technical Details of CVE-2021-27771
This section provides technical insights into the vulnerability.
Vulnerability Description
The vulnerability arises from the ability to modify User SIDs, allowing for unauthorized actions like file uploads and directory deletions.
Affected Systems and Versions
HCL Sametime version 11.6 is specifically affected by this vulnerability.
Exploitation Mechanism
Attackers can exploit this vulnerability by manipulating User SIDs and utilizing them to perform malicious activities.
Mitigation and Prevention
Protecting systems from CVE-2021-27771 requires immediate action and long-term security practices.
Immediate Steps to Take
Users should apply relevant security patches provided by HCL Software to mitigate the vulnerability. Additionally, monitoring system logs for suspicious activities can help detect any potential exploitation attempts.
Long-Term Security Practices
Implementing secure coding practices, conducting regular security audits, and ensuring timely software updates can reduce the risk of such vulnerabilities in the future.
Patching and Updates
Stay updated with security advisories from HCL Software and apply patches promptly to address security vulnerabilities and enhance system protection.