CyberSecBulletin
CVE-2024-21805NVD status: Analyzed

SKYSEA Client View: Improper Access Control

Published Updated By the CyberSecBulletin desk

CVE-2024-21805 is a high-severity improper access control vulnerability in SKYSEA Client View from Sky, 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 unauthenticated attacker, but only if a user takes part, for example by opening a link or file. Affected SKYSEA Client View versions: versions from Ver.16.100 prior to Ver.19.2. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.24% 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 skysea_client_view to 19.2 or a later version.
  2. Read the advisory on skyseaclientview.net for workarounds and exact fixed builds.
  3. Because the attack needs a user to take part, warn users about unexpected links and files related to this product until it is patched.

Affected products and versions

VendorProductAffected versionsFixed in
SkySKYSEA Client Viewversions from Ver.16.100 prior to Ver.19.2Not stated
Skygroupskysea_client_view16.100 up to, but not including, 19.219.2

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
NoneNo account or login is needed.
User interaction
RequiredA user must take an action such as opening a file or link.
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:N/UI:R/S:U/C:H/I:H/A:H. Scored by CISA (ADP).

Official description

Improper access control vulnerability exists in the specific folder of SKYSEA Client View versions from Ver.16.100 prior to Ver.19.2. If this vulnerability is exploited, an arbitrary file may be placed in the specific folder by a user who can log in to the PC where the product's Windows client is installed. In case the file is a specially crafted DLL file, arbitrary code may be executed with SYSTEM privilege.

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

The underlying weakness: Improper Access Control

The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.

How developers prevent this class of flaw

  • Very carefully manage the setting, management, and handling of privileges. Explicitly manage trust zones in the software.
  • Compartmentalize the system to have safe areas where trust boundaries can be unambiguously drawn. Do not allow sensitive data to go outside of the trust boundary and always be careful when interfacing with a compartment outside of the safe area. Ensure that appropriate compartmentalization is built into the system design, and the compartmentalization allows for and reinforces privilege separation functionality. Architects and designers should rely on the principle of least privilege to decide the appropriate time to use privileges and the time to drop privileges.

More Improper Access Control vulnerabilities (CWE-284)

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

Third-party and government advisories

Other vulnerabilities in SKYSEA Client View

All SKYSEA Client View vulnerabilities

Recent Improper Access Control vulnerabilities

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