CVE-2021-23772 : Vulnerability Insights and Analysis

This CVE-2021-23772 involves an arbitrary file write vulnerability that affects package github.com/kataras/iris and github.com/kataras/iris/v12. The flaw allows attackers to write to arbitrary locations outside the designated target folder.

Understanding CVE-2021-23772

This section will delve into the details of the CVE-2021-23772 vulnerability.

What is CVE-2021-23772?

CVE-2021-23772 is an arbitrary file write vulnerability that impacts all versions of the github.com/kataras/iris and github.com/kataras/iris/v12 packages. The vulnerability arises due to the unsafe handling of file names during file upload using the UploadFormFiles method.

The Impact of CVE-2021-23772

The vulnerability poses a high risk with a CVSS base score of 7.5, along with high impacts on confidentiality, integrity, and availability. Attackers can exploit this flaw to write to unauthorized locations, potentially leading to unauthorized access or data corruption.

Technical Details of CVE-2021-23772

This section will outline the technical aspects of the CVE-2021-23772 vulnerability.

Vulnerability Description

The vulnerability allows attackers to write to arbitrary locations outside the intended target directory by manipulating file names during the upload process using the UploadFormFiles method.

Affected Systems and Versions

All versions of the github.com/kataras/iris and github.com/kataras/iris/v12 packages are affected by this vulnerability.

Exploitation Mechanism

Attackers can exploit this vulnerability over a network connection, leveraging a high attack complexity and privilege requirement, but no user interaction is needed.

Mitigation and Prevention

This section will detail the steps to mitigate and prevent exploitation of CVE-2021-23772.

Immediate Steps to Take

Implement file upload validation to ensure that uploaded files are stored only in designated directories, restricting access to write to arbitrary locations.

Long-Term Security Practices

Regularly update the package github.com/kataras/iris and github.com/kataras/iris/v12 to the latest versions to address security vulnerabilities and ensure secure file handling.

Patching and Updates

Apply patches provided by the package maintainers promptly to address the arbitrary file write vulnerability in github.com/kataras/iris and github.com/kataras/iris/v12 packages.