CyberSecBulletin
CVE-2024-52877NVD status: Analyzed

Insydeh2o: Buffer Over-read

Published Updated By the CyberSecBulletin desk

CVE-2024-52877 is a high-severity buffer over-read vulnerability in Insydeh2o from Insyde, with a CVSS 3.1 base score of 7.5 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. The record lists versions 5.2.05.29.50, 5.3.05.38.50, 5.4.05.46.50 as the first without the flaw, so updating Insydeh2o to one of those releases or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.48% chance of exploitation within 30 days, which is low compared with other CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Update Insydeh2o to 5.2.05.29.50 or 5.3.05.38.50 or 5.4.05.46.50 or 5.5.05.54.50, whichever matches your release line, or a later version.
  2. Read the advisory on insyde.com for workarounds and exact fixed builds.
  3. Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.

Affected products and versions

VendorProductAffected versionsFixed in
InsydeInsydeh2o5.2 up to, but not including, 5.2.05.29.50; 5.3 up to, but not including, 5.3.05.38.50; 5.4 up to, but not including, 5.4.05.46.50; 5.5 up to, but not including, 5.5.05.54.50; 5.6 up to, but not including, 5.6.05.61.50; 5.7 up to, but not including, 5.7.05.70.505.2.05.29.50, 5.3.05.38.50, 5.4.05.46.50, 5.5.05.54.50, 5.6.05.61.50, 5.7.05.70.50

Version data comes from NVD's product matching. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
NetworkCan be exploited remotely over a network, including the internet.
Attack complexity
LowNo special conditions are needed; the attack works reliably.
Privileges required
NoneNo account or login is needed.
User interaction
NoneNo action by a victim is required.
Scope
UnchangedImpact stays within the vulnerable component.
Confidentiality
HighAll data handled by the component can be read.
Integrity
NoneNothing can be modified.
Availability
NoneAvailability is not affected.

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N. Scored by CISA (ADP).

Official description

An issue was discovered in Insyde InsydeH2O kernel 5.2 before version 05.29.50, kernel 5.3 before version 05.38.50, kernel 5.4 before version 05.46.50, kernel 5.5 before version 05.54.50, kernel 5.6 before version 05.61.50, and kernel 5.7 before version 05.70.50. In VariableRuntimeDxe driver, callback function SmmCreateVariableLockList () calls CreateVariableLockListInSmm (). In CreateVariableLockListInSmm (), it uses StrSize () to get variable name size and it could lead to a buffer over-read.

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Buffer Over-read

The product reads from a buffer using buffer access mechanisms such as indexes or pointers that reference memory locations after the targeted buffer.

More Buffer Over-read vulnerabilities (CWE-126)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: partial).
  3. Record last changed materially (score, affected products, status or references).

References

Other vulnerabilities in Insydeh2o

All Insydeh2o vulnerabilities

Recent Buffer Over-read vulnerabilities

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