CyberRota Analysis
AI-GeneratedData::PubSub::Shared versions prior to 0.07 for Perl are vulnerable due to the creation of a world-readable mmap backing file, allowing local users to access sensitive IPC payloads. The absence of O_EXCL and O_NOFOLLOW flags enables attackers to exploit symlink and pre-planted file vulnerabilities, potentially leading to unauthorized data exposure. Organizations using affected versions should prioritize patching this vulnerability to mitigate risks associated with local user attacks.
Original NVD Description
Data::PubSub::Shared versions before 0.07 for Perl create a world-readable mmap backing file and open it without O_EXCL or O_NOFOLLOW. The segment is created in pubsub.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.