CVE-2023-24932

CVE-2023-24932 is a significant vulnerability identified in Microsoft's Secure Boot Security Feature. This flaw in software design or implementation allowed for a bypass of the Secure Boot function, presenting a considerable security risk. The vulnerability was exploited in the wild and became associated with the BlackLotus UEFI bootkit, a malicious tool sold on Dark Web forums for $5,000. The initial exploitation of this vulnerability had a substantial impact, drawing significant attention due to its potential for misuse. Microsoft first patched this Secure Boot flaw (CVE-2023-24932) in May 2023. The patch was released as part of the company's regular Patch Tuesday updates and addressed an additional vulnerability known as Baton Drop. However, while the new patch introduced configuration options to manually enable protections against the vulnerability, these were not automatically enabled, potentially leaving some systems exposed if users did not manually activate these protections. Following the first patch, Microsoft released another update to address a subsequent Secure Boot bypass issue also linked to CVE-2023-24932. This update aimed to revoke malicious boot managers, further strengthening system defenses. Despite these efforts, the Secure Boot Security Feature Bypass issue continued to be actively exploited by the BlackLotus bootkit malware, making it one of the most noteworthy zero-day patches to date.