Linux kernel before 5.4.2 Improper Privilege Management Vulnerability

Summary

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. 

Credit:

The information has been provided by Greg Kroah-Hartman 

The original article can be found at:https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.2


Details

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.

 

Vulnerable Systems:

Linux kernel before 5.4.2

 

CVE Information:

CVE-2019-19241

 

Disclosure Timeline:
Published Date:12/17/2019

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