CVE-2024-32041 in FreeRDP
Summary
by MITRE • 04/23/2024
FreeRDP is a free implementation of the Remote Desktop Protocol. FreeRDP based clients that use a version of FreeRDP prior to 3.5.0 or 2.11.6 are vulnerable to out-of-bounds read. Versions 3.5.0 and 2.11.6 patch the issue. As a workaround, deactivate `/gfx` (on by default, set `/bpp` or `/rfx` options instead.
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Analysis
by VulDB Data Team • 11/20/2024
CVE-2024-32041 represents a critical out-of-bounds read vulnerability affecting FreeRDP implementations across multiple versions. This vulnerability exists within the Remote Desktop Protocol implementation that enables remote desktop connections and is particularly concerning given the widespread adoption of FreeRDP in enterprise environments. The flaw manifests when processing certain graphics-related data structures, specifically within the graphics pipeline that handles remote desktop sessions. The vulnerability stems from insufficient bounds checking in memory allocation and data processing operations, allowing attackers to read memory locations beyond the intended buffer boundaries.
The technical exploitation of this vulnerability occurs through malformed graphics data packets sent during remote desktop sessions, particularly when the `/gfx` option is enabled. This graphics optimization feature, while enhancing user experience, creates a pathway for attackers to trigger memory access violations that could lead to information disclosure or potential remote code execution. The out-of-bounds read allows attackers to access sensitive data from adjacent memory locations, potentially exposing credentials, session tokens, or other confidential information. This issue aligns with CWE-129, which addresses improper validation of length of input buffers, and represents a classic example of memory safety vulnerabilities that have been increasingly targeted in recent years.
The operational impact of this vulnerability extends beyond simple information disclosure, as it could enable attackers to escalate privileges or gain deeper access to systems within the network. Organizations relying on FreeRDP for remote desktop connections face significant risk, particularly those with less sophisticated monitoring capabilities that might not detect subtle memory access patterns. The vulnerability affects both the 2.x and 3.x release lines of FreeRDP, requiring organizations to carefully evaluate their deployment strategies and potentially upgrade across major version boundaries. The default activation of the `/gfx` option in many FreeRDP implementations makes this vulnerability particularly dangerous, as it requires minimal user interaction to exploit.
Organizations should prioritize immediate remediation by upgrading to FreeRDP versions 3.5.0 or 2.11.6, which contain the necessary patches to address the out-of-bounds read conditions. The workaround of disabling `/gfx` functionality provides a temporary mitigation strategy while upgrades are deployed, though this may impact user experience and functionality. Security teams should implement monitoring for unusual graphics-related memory access patterns and consider network segmentation to limit potential exploitation vectors. The ATT&CK framework categorizes this vulnerability under T1059 for remote code execution capabilities and T1566 for initial access through network services. Additionally, organizations should conduct thorough vulnerability assessments of their remote desktop infrastructure and ensure proper patch management processes are in place to address similar vulnerabilities in other remote access implementations.