CVE-2021-43973 : Security Advisory and Response
Learn about CVE-2021-43973, an unrestricted file upload flaw in SysAid ITIL 20.4.74 b10 that allows remote authenticated attackers to upload arbitrary files and reveal server-side file paths. Find mitigation steps and prevention measures here.
An unrestricted file upload vulnerability in SysAid ITIL 20.4.74 b10 allows a remote authenticated attacker to upload arbitrary files with potential server-side filesystem path exposure.
Understanding CVE-2021-43973
This CVE involves a severe file upload vulnerability in SysAid ITIL 20.4.74 b10, potentially leading to unauthorized file uploads and path exposure.
What is CVE-2021-43973?
The vulnerability allows a remote authenticated attacker to upload any file by exploiting the /UploadPsIcon.jsp endpoint using the file parameter in the HTTP POST body.
The Impact of CVE-2021-43973
Successful exploitation can enable an attacker to upload malicious files and potentially disclose sensitive server-side filesystem paths, increasing the risk of further attacks.
Technical Details of CVE-2021-43973
This section covers the specific technical aspects of the vulnerability.
Vulnerability Description
SysAid ITIL 20.4.74 b10 is affected by an unrestricted file upload vulnerability, allowing authenticated attackers to upload arbitrary files and obtain the absolute path of the uploaded file.
Affected Systems and Versions
- Product: SysAid ITIL 20.4.74 b10
- Vendor: SysAid
- Version Status: Affected
Exploitation Mechanism
By sending a crafted request to /UploadPsIcon.jsp with the file parameter in the HTTP POST body, a remote attacker can upload malicious files to the server, potentially leading to file path exposure.
Mitigation and Prevention
Protect your systems from CVE-2021-43973 with the following steps:
Immediate Steps to Take
- Apply patches or updates provided by SysAid to fix the vulnerability.
- Restrict access to vulnerable endpoints and implement proper input validation.
- Monitor file uploads for suspicious activities.
Long-Term Security Practices
- Conduct regular security assessments and penetration testing to identify and address vulnerabilities.
- Educate users on secure file upload practices and potential risks.
Patching and Updates
Ensure timely installation of security patches and updates from SysAid to mitigate the vulnerability and enhance system security.