CyberSecBulletin
CVE-2024-6287NVD status: Modified

rcar_gen3_v2.5: Incorrect Calculation

Published Updated By the CyberSecBulletin desk

CVE-2024-6287 is a high-severity incorrect calculation vulnerability in rcar_gen3_v2.5 from Renesas, with a CVSS 3.1 base score of 7.8 out of 10. It can be exploited with local access to the system by an attacker with a low-privileged account, without any action from a user. The record lists version 954d488a9798f8fda675c6b57c571b469b298f04 as the first without the flaw, so updating rcar_gen3_v2.5 to that release or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.19% 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 rcar_gen3_v2.5 to 954d488a9798f8fda675c6b57c571b469b298f04 or a later version.
  2. Read the advisory on asrg.io for workarounds and exact fixed builds.

Affected products and versions

VendorProductAffected versionsFixed in
Renesasrcar_gen3_v2.56a96c18c474e6339fab93f54d52aa7dcc4b70e52 up to, but not including, 954d488a9798f8fda675c6b57c571b469b298f04954d488a9798f8fda675c6b57c571b469b298f04
Renesasrcar_gen3_firmwarev2.5Not stated
RenesasRcar Gen3v2.5Not stated

Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
LocalThe attacker needs local access or must trick a user into running something.
Attack complexity
LowNo special conditions are needed; the attack works reliably.
Privileges required
LowA basic user account is enough.
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
HighData or code can be modified at will.
Availability
HighThe component can be taken down completely.

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

Scoring systemScoreSeverityScored by
CVSS 3.17.5HighCNA (asrg.io)
CVSS 3.17.8HighNVD

Official description

Incorrect Calculation vulnerability in Renesas arm-trusted-firmware allows Local Execution of Code. When checking whether a new image invades/overlaps with a previously loaded image the code neglects to consider a few cases. that could An attacker to bypass memory range restriction and overwrite an already loaded image partly or completely, which could result in code execution and bypass of secure boot.

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

The underlying weakness: Incorrect Calculation

The product performs a calculation that generates incorrect or unintended results that are later used in security-critical decisions or resource management.

How developers prevent this class of flaw

  • Understand your programming language's underlying representation and how it interacts with numeric calculation. Pay close attention to byte size discrepancies, precision, signed/unsigned distinctions, truncation, conversion and casting between types, not-a-number calculations, and how your language handles numbers that are too large or too small for its underlying representation.
  • Perform input validation on any numeric input by ensuring that it is within the expected range. Enforce that the input meets both the minimum and maximum requirements for the expected range.
  • Use the appropriate type for the desired action. For example, in C/C++, only use unsigned types for values that could never be negative, such as height, width, or other numbers related to quantity.

More Incorrect Calculation vulnerabilities (CWE-682)

Timeline

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

References

Advisories

Recent Incorrect Calculation vulnerabilities

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