CyberRota Analysis
AI-GeneratedThe vulnerability affects the copydir() function in the afpd daemon of Netatalk versions 3.1.19 through 4.4.2, allowing for a stack-based buffer overflow due to an integer underflow in buffer size calculations. This flaw can lead to arbitrary code execution, posing a significant risk to systems using these versions for file sharing. Administrators of affected Netatalk installations should prioritize upgrading to version 4.4.3 or implementing the recommended workaround to mitigate potential exploitation.
Public Exploit Signal
A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.
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Original NVD Description
Netatalk is a Free and Open Source file server suite for Unix-like operating systems. In versions 3.1.19 through 4.4.2, a stack-based buffer overflow exists in the copydir() function of Netatalk's afpd daemon due to an integer underflow in the calculation of the remaining buffer size used for path construction. copydir() is a utility function called when a file operation crosses a device boundary inside an AFP shared volume, which the standard library's renameat() cannot handle. The function attempts to track available buffer space using srem and drem for source and destination paths. Incorrect arithmetic causes both srem and drem to underflow to SIZE_MAX. Consequently, boundary checks against strlen(de->d_name) always pass, allowing strcpy() to append filenames into nearly full stack buffers. Version 4.4.3 patches the issue. As a workaround, configure each AFP shared volume to be structured as a single file system, in other words no subdirectory of a shared volume should be a mount point for a different file system.