Note:
This project will be discontinued after December 13, 2021. [more]
2019-12-17
In the Linux kernel before 5.4.2, the io_uring feature leads to requests that inadvertently have UID 0 and full capabilities, aka CID-181e448d8709. This is related to fs/io-wq.c, fs/io_uring.c, and net/socket.c. For example, an attacker can bypass intended restrictions on adding an IPv4 address to the loopback interface. This occurs because IORING_OP_SENDMSG operations, although requested in the context of an unprivileged user, are sometimes performed by a kernel worker thread without considering that context.
Products | Linux_kernel |
Type | Improper Privilege Management (CWE-269) |
First patch | - None (likely due to unavailable code) |
Links |
• https://bugs.chromium.org/p/project-zero/issues/detail?id=1975
• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d69e07793f891524c6bbf1e75b9ae69db4450953 • https://security.netapp.com/advisory/ntap-20200103-0001/ • https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=181e448d8709e517c9c7b523fcd209f24eb38ca7 • https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.2 |