CyberRota Analysis
AI-GeneratedThe Data::RingBuffer::Shared module for Perl prior to version 0.04 is vulnerable due to the creation of a world-readable memory-mapped file that can be exploited by local users. This flaw allows attackers to read sensitive inter-process communication (IPC) data or manipulate the file by leveraging symlinks, potentially leading to unauthorized information disclosure. Organizations using this module, particularly those in multi-user environments, should prioritize patching to mitigate the risk of local attacks.
Original NVD Description
Data::RingBuffer::Shared versions before 0.04 for Perl create a world-readable mmap backing file and open it without O_EXCL or O_NOFOLLOW. The segment is created in ring.h with open(path, O_RDWR|O_CREAT, 0666). The mode is 0666, so under the default umask 022 the file is created mode 0644 (world-readable). O_NOFOLLOW is absent, so a symlink planted at the path is followed, and O_EXCL is absent, so the open silently uses a pre-planted file instead of failing. 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 file or symlink at the path lets a local attacker win a pre-creation race or redirect the open.