CVE-2019-20849 : Exploit Details and Defense Strategies

Mattermost Mobile Apps prior to version 1.26.0 have a vulnerability where cookie information can persist on a device after logging out.

Understanding CVE-2019-20849

This CVE identifies a security issue in Mattermost Mobile Apps that can lead to persistent cookie data on devices.

What is CVE-2019-20849?

This CVE pertains to a flaw in Mattermost Mobile Apps versions before 1.26.0, allowing cookie information to remain on a device post logout.

The Impact of CVE-2019-20849

The vulnerability could expose sensitive user data if the device is accessed by unauthorized parties.

Technical Details of CVE-2019-20849

Mattermost Mobile Apps versions prior to 1.26.0 are affected by this security issue.

Vulnerability Description

Cookie data can persist on a device even after a user logs out from the application.

Affected Systems and Versions

Product: Mattermost Mobile Apps
Vendor: Mattermost
Versions affected: All versions before 1.26.0

Exploitation Mechanism

Unauthorized users can potentially access sensitive information stored in the persistent cookies on the device.

Mitigation and Prevention

Immediate action and long-term security practices are crucial to mitigate the risks associated with CVE-2019-20849.

Immediate Steps to Take

Users should update their Mattermost Mobile Apps to version 1.26.0 or later to eliminate the vulnerability.
Clear cookies and cache on devices where the vulnerable app was used.

Long-Term Security Practices

Regularly update applications to the latest versions to ensure security patches are in place.
Educate users on the importance of logging out and clearing cookies after app usage.

Patching and Updates

Mattermost has released version 1.26.0, which addresses the vulnerability. Users are advised to update their apps promptly.