Cobalt Strike 4.11.1 Released With SSL Checkbox Fix

Cobalt Strike has announced the release of version 4.11.1, an out-of-band update addressing several critical issues discovered in the previous 4.11 release.

The update primarily fixes a module stomping issue that could cause system crashes in specific circumstances, resolves problems with the “Enable SSL” checkbox functionality, and adds clearer deprecation warnings for stomp reflective loaders.

The unexpected release underscores the development team’s commitment to addressing critical bugs promptly rather than waiting for the next scheduled update.

The most significant improvement in Cobalt Strike 4.11.1 addresses a critical issue where Beacon would crash in certain edge cases.

This occurred specifically when module stomping was used together with ObfSetThreadContext injection in processes with Control Flow Guard (CFG) enabled.

The development team has implemented a patch to prevent these crashes, ensuring more stable operation during penetration testing activities.

Technical users implementing User Defined Reflective Loaders (UDRL) that perform module stomping should note an important recommendation: setting METHOD_MODULESTOMP as part of the ALLOCATED_MEMORY structure within the UDRL.

This configuration helps Beacon recognize and avoid potential CFG-related issues.

The team points users to the bud-loader in UDRL-vs, available in the Cobalt Strike arsenal kit, as a reference implementation of this approach.

SSL Checkbox Fix

The update resolves a persistent issue affecting users working with self-signed certificates.

Previously, when users configured the ‘https-certificate’ option to utilize a self-signed certificate, the ‘Enable SSL’ checkbox would remain disabled, preventing proper HTTPS enablement in the teamserver.

This limitation caused workflow disruptions for security professionals using custom certificates.

With Cobalt Strike 4.11.1, self-signed certificates now properly enable the ‘Enable SSL’ checkbox functionality, streamlining the setup process.

The development team references additional documentation for users needing guidance on implementing SSL certificates, directing them to resources on “Self-signed SSL Certificates with SSL Beacon” and “Valid SSL Certificates with SSL Beacon.”

Stomp Loader Deprecation Warning

As previously announced in the Cobalt Strike 4.11 release notes, the development team is phasing out support for stomp loaders in favor of prepend loaders.

The 4.11.1 update reinforces this shift by implementing explicit deprecation warnings in the c2lint program, ensuring users are aware of the impending change.

This more visible notification serves as an additional reminder for penetration testers and security professionals to update their workflows and custom tools to accommodate the architectural shift away from stomp loaders.

The decision to highlight the deprecation again in both the program and release notes reflects the importance the development team places on this transition.

Licensed users can download version 4.11.1 from the official website. For environments where updates aren’t desirable, users can obtain new authorization files through the Authorization Generation page.

The development team encourages users to report any additional issues through the official support channels to ensure continued improvements to the platform.

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