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CVE-2023-0045 Detail

Description

The current implementation of the prctl syscall does not issue an IBPB immediately during the syscall. The ib_prctl_set  function updates the Thread Information Flags (TIFs) for the task and updates the SPEC_CTRL MSR on the function __speculation_ctrl_update, but the IBPB is only issued on the next schedule, when the TIF bits are checked. This leaves the victim vulnerable to values already injected on the BTB, prior to the prctl syscall.  The patch that added the support for the conditional mitigation via prctl (ib_prctl_set) dates back to the kernel 4.9.176. We recommend upgrading past commit a664ec9158eeddd75121d39c9a0758016097fa96


Severity



CVSS 3.x Severity and Metrics:

NIST CVSS score
NIST: NVD
Base Score:  7.5 HIGH
Vector:  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Nist CVSS score does not match with CNA score
CNA:  Google Inc.
Base Score:  4.7 MEDIUM
Vector:  CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N


NVD Analysts use publicly available information to associate vector strings and CVSS scores. We also display any CVSS information provided within the CVE List from the CNA.

Note: It is possible that the NVD CVSS may not match that of the CNA. The most common reason for this is that publicly available information does not provide sufficient detail or that information simply was not available at the time the CVSS vector string was assigned.

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Hyperlink Resource
https://git.kernel.org/tip/a664ec9158eeddd75121d39c9a0758016097fa96 Mailing List  Patch 
https://github.com/google/security-research/security/advisories/GHSA-9x5g-vmxf-4qj8 Exploit  Third Party Advisory 
https://lists.debian.org/debian-lts-announce/2023/05/msg00005.html Mailing List  Third Party Advisory 
https://lists.debian.org/debian-lts-announce/2023/05/msg00006.html Mailing List  Third Party Advisory 
https://security.netapp.com/advisory/ntap-20230714-0001/ Third Party Advisory 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-610 Externally Controlled Reference to a Resource in Another Sphere cwe source acceptance level NIST   Contributor acceptance level Google Inc.  

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Change History

8 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2023-0045
NVD Published Date:
04/25/2023
NVD Last Modified:
08/11/2023
Source:
Google Inc.