CyberSecBulletin
CVE-2024-39865NVD status: Modified

SINEMA Remote Connect Server: Unrestricted Upload of File with Dangerous Type

Published Updated By the CyberSecBulletin desk

CVE-2024-39865 is a high-severity unrestricted upload of file with dangerous type vulnerability in SINEMA Remote Connect Server from Siemens, with a CVSS 3.1 base score of 8.8 out of 10. It can be exploited remotely over the network by an attacker with a low-privileged account, without any action from a user. The record lists versions V3.2 SP1, 3.2 as the first without the flaw, so updating SINEMA Remote Connect Server to one of those releases or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.45% 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 SINEMA Remote Connect Server to V3.2 SP1 or 3.2, whichever matches your release line, or a later version.
  2. Read the advisory on cert-portal.siemens.com for workarounds and exact fixed builds.

Affected products and versions

VendorProductAffected versionsFixed in
SiemensSINEMA Remote Connect Serverbefore V3.2 SP1; before 3.2V3.2 SP1, 3.2

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
NetworkCan be exploited remotely over a network, including the internet.
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:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. Scored by NVD.

Scoring systemScoreSeverityScored by
CVSS 4.08.7HighCNA (siemens.com)
CVSS 3.18.8HighCNA (siemens.com)
CVSS 3.18.8HighNVD

Official description

A vulnerability has been identified in SINEMA Remote Connect Server (All versions < V3.2 SP1). The affected application allows users to upload encrypted backup files. As part of this backup, files can be restored without correctly checking the path of the restored file. This could allow an attacker with access to the backup encryption key to upload malicious files, that could potentially lead to remote code execution.

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

The underlying weakness: Unrestricted Upload of File with Dangerous Type

The product allows the upload or transfer of dangerous file types that are automatically processed within its environment.

How developers prevent this class of flaw

  • Generate a new, unique filename for an uploaded file instead of using the user-supplied filename, so that no external input is used at all.
  • When the set of acceptable objects, such as filenames or URLs, is limited or known, create a mapping from a set of fixed input values (such as numeric IDs) to the actual filenames or URLs, and reject all other inputs.
  • Consider storing the uploaded files outside of the web document root entirely. Then, use other mechanisms to deliver the files dynamically.

More Unrestricted Upload of File with Dangerous Type vulnerabilities (CWE-434)

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

Other vulnerabilities in SINEMA Remote Connect Server

All SINEMA Remote Connect Server vulnerabilities

Recent Unrestricted Upload of File with Dangerous Type vulnerabilities

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