Externally Controlled Reference to a Resource in Another Sphere Affecting perf package, versions <0:4.14.304-226.531.amzn2


Severity

Recommended
high

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.14% (52nd percentile)

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  • Snyk IDSNYK-AMZN2-PERF-5789062
  • published20 Jul 2023
  • disclosed25 Apr 2023

Introduced: 25 Apr 2023

CVE-2023-0045  (opens in a new tab)
CWE-610  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2 perf to version 0:4.14.304-226.531.amzn2 or higher.
This issue was patched in ALAS2-2023-1932.

NVD Description

Note: Versions mentioned in the description apply only to the upstream perf package and not the perf package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2 relevant fixed versions and status.

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

CVSS Scores

version 3.1