CVE-2019-19241 Information

Description

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.

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Reference

https://bugs.chromium.org/p/project-zero/issues/detail?id=1975 https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.2 https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=181e448d8709e517c9c7b523fcd209f24eb38ca7 https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d69e07793f891524c6bbf1e75b9ae69db4450953 https://security.netapp.com/advisory/ntap-20200103-0001/ https://usn.ubuntu.com/4284-1/

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

7.8