CyberRota Analysis
AI-GeneratedVersions of Data::Buffer::Shared prior to 0.05 for Perl are vulnerable due to the creation of a world-readable mmap backing file without the O_NOFOLLOW flag, allowing local users to access sensitive IPC payloads. The combination of a permissive file mode and the potential for symlink redirection poses a risk of unauthorized data exposure. Organizations using affected versions should prioritize patching to mitigate the risk of data leaks and ensure secure inter-process communication.
Original NVD Description
Data::Buffer::Shared versions before 0.05 for Perl create a world-readable mmap backing file and open it without O_NOFOLLOW. The segment is created in buf_generic.h with open(path, O_RDWR|O_CREAT|O_EXCL, 0666). O_EXCL blocks a pre-seeded file on create, but the mode is 0666, so under the default umask 022 the file is created mode 0644 (world-readable), and O_NOFOLLOW is absent, so a symlink planted at the path is followed when the segment is attached. A "Shared" segment naturally lives in a shared directory such as /tmp or /dev/shm, where any local user can read the IPC payloads stored in the world-readable segment, and a pre-planted symlink at the path redirects the open to another file.