[Update: At the time of publication, this vulnerability had not been addressed by Fortinet. On December 18, 2024, Fortinet published a public acknowledgement of the issue, affected versions, as well as patching & workaround advice.] KEY TAKEAWAYS Volexity discovered and reported a vulnerability in Fortinet’s Windows VPN client, FortiClient, where user credentials remain in process memory after a user authenticates to the VPN. This vulnerability was abused by BrazenBamboo in their DEEPDATA malware. BrazenBamboo is the threat actor behind development of the LIGHTSPY malware family. LIGHTSPY variants have been discovered for all major operating systems, including iOS, and Volexity has recently discovered a new Windows variant. In July 2024, Volexity identified exploitation of a zero-day credential disclosure vulnerability in Fortinet’s Windows VPN client that allowed credentials to be stolen from the memory of the client’s process. This vulnerability was discovered while analyzing a recent sample of the DEEPDATA malware family. […]
