CyberSecBulletin
CVE-2023-34971NVD status: Modified

QTS: Inadequate Encryption Strength

Published Updated By the CyberSecBulletin desk

CVE-2023-34971 is a high-severity inadequate encryption strength vulnerability in QTS from QNAP, with a CVSS 3.1 base score of 8.8 out of 10. It can be exploited from the same local network by an unauthenticated attacker, without any action from a user. The record lists versions 5.0.1.2425 build 20230609, 5.1.0.2444 build 20230629, 4.5.4.2467 build 20230718 as the first without the flaw, so updating QTS to one of those releases or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.1% 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 QTS to 5.0.1.2425 build 20230609 or 5.1.0.2444 build 20230629 or 4.5.4.2467 build 20230718, whichever matches your release line, or a later version.
  2. Update QuTS hero to h5.1.0.2424 build 20230609 or h4.5.4.2476 build 20230728, whichever matches your release line, or a later version.
  3. Read the advisory on qnap.com for workarounds and exact fixed builds.

Affected products and versions

VendorProductAffected versionsFixed in
QNAPQTS5.0.* up to, but not including, 5.0.1.2425 build 20230609; 5.1.* up to, but not including, 5.1.0.2444 build 20230629; 4.5.* up to, but not including, 4.5.4.2467 build 202307185.0.1.2425 build 20230609, 5.1.0.2444 build 20230629, 4.5.4.2467 build 20230718
QNAPQuTS heroh5.1.* up to, but not including, h5.1.0.2424 build 20230609; h4.5.* up to, but not including, h4.5.4.2476 build 20230728h5.1.0.2424 build 20230609, h4.5.4.2476 build 20230728

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
AdjacentThe attacker must be on the same local network segment.
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
HighData or code can be modified at will.
Availability
HighThe component can be taken down completely.

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

Scoring systemScoreSeverityScored by
CVSS 3.17.1HighCNA (qnapsecurity.com.tw)
CVSS 3.18.8HighNVD

Official description

An inadequate encryption strength vulnerability has been reported to affect QNAP operating systems. If exploited, the vulnerability possibly allows local network clients to decrypt the data using brute force attacks via unspecified vectors. We have already fixed the vulnerability in the following versions: QTS 5.0.1.2425 build 20230609 and later QTS 5.1.0.2444 build 20230629 and later QTS 4.5.4.2467 build 20230718 and later QuTS hero h5.1.0.2424 build 20230609 and later QuTS hero h4.5.4.2476 build 20230728 and later

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

The underlying weakness: Inadequate Encryption Strength

The product stores or transmits sensitive data using an encryption scheme that is theoretically sound, but is not strong enough for the level of protection required.

How developers prevent this class of flaw

  • Use an encryption scheme that is currently considered to be strong by experts in the field.

More Inadequate Encryption Strength vulnerabilities (CWE-326)

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 QTS

All QTS vulnerabilities

Recent Inadequate Encryption Strength vulnerabilities

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