CVE-2026-64613: EGOR Data::Buffer::Shared, обхождане на път

Описание

Оригинално описание

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.

Засегнати продукти

• EGOR Data::Buffer::Shared: преди 0.05

Вид слабост

• CWE-732 Incorrect Permission Assignment for Critical Resource
• CWE-59 Неправилно разрешаване на връзка преди достъп до файл

История

Първоизточници

• https://www.cve.org/CVERecord?id=CVE-2026-64613
• https://nvd.nist.gov/vuln/detail/CVE-2026-64613
• https://metacpan.org/release/EGOR/Data-Buffer-Shared-0.05/diff/EGOR/Data-Buffer-Shared-0.04#buf_generic.h
• https://metacpan.org/release/EGOR/Data-Buffer-Shared-0.05/changes