CVE-2023-41051

medium

Description

In a typical Virtual Machine Monitor (VMM) there are several components, such as boot loader, virtual device drivers, virtio backend drivers and vhost drivers, that need to access the VM physical memory. The vm-memory rust crate provides a set of traits to decouple VM memory consumers from VM memory providers. An issue was discovered in the default implementations of the `VolatileMemory::{get_atomic_ref, aligned_as_ref, aligned_as_mut, get_ref, get_array_ref}` trait functions, which allows out-of-bounds memory access if the `VolatileMemory::get_slice` function returns a `VolatileSlice` whose length is less than the function’s `count` argument. No implementations of `get_slice` provided in `vm_memory` are affected. Users of custom `VolatileMemory` implementations may be impacted if the custom implementation does not adhere to `get_slice`'s documentation. The issue started in version 0.1.0 but was fixed in version 0.12.2 by inserting a check that verifies that the `VolatileSlice` returned by `get_slice` is of the correct length. Users are advised to upgrade. There are no known workarounds for this issue.

References

https://lists.fedoraproject.org/archives/list/[email protected]/message/XZGJL6BQLU4XCPQLLTW4GSSBTNQXB3TI/

https://lists.fedoraproject.org/archives/list/[email protected]/message/SYM6CYW2DWRHRAVL2HYTQPXC3J2V77J4/

https://lists.fedoraproject.org/archives/list/[email protected]/message/IPXRXD5VXBZHBGMUM77B52CJJMG7EJGI/

https://github.com/rust-vmm/vm-memory/security/advisories/GHSA-49hh-fprx-m68g

https://github.com/rust-vmm/vm-memory/commit/aff1dd4a5259f7deba56692840f7a2d9ca34c9c8

https://crates.io/crates/vm-memory/0.12.2

Details

Source: Mitre, NVD

Published: 2023-09-01

Updated: 2023-09-28

Risk Information

CVSS v2

Base Score: 4

Vector: CVSS2#AV:L/AC:H/Au:N/C:N/I:N/A:C

Severity: Medium

CVSS v3

Base Score: 4.7

Vector: CVSS:3.0/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H

Severity: Medium