CyberSecBulletin
CVE-2024-50388NVD status: Analyzed

HBS 3 Hybrid Backup Sync: Improper Neutralization of Special Elements used in a Command

Published Updated By the CyberSecBulletin desk

CVE-2024-50388 is a critical-severity improper neutralization of special elements used in a command vulnerability in HBS 3 Hybrid Backup Sync from QNAP, with a CVSS 3.1 base score of 9.8 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. The record lists version 25.1.1.673 as the first without the flaw, so updating HBS 3 Hybrid Backup Sync to that release or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 2.3% chance of exploitation within 30 days, higher than 84% of scored CVEs.

Patch this week

Critical severity: a successful attack would have severe impact.

What to do

  1. Update HBS 3 Hybrid Backup Sync to 25.1.1.673 or a later version.
  2. Update hbs_3 to 25.1.1.673 or a later version.
  3. Read the advisory on qnap.com for workarounds and exact fixed builds.
  4. 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
QNAPHBS 3 Hybrid Backup Sync25.1.x up to, but not including, 25.1.1.67325.1.1.673
QNAPhbs_325.1.x up to, but not including, 25.1.1.67325.1.1.673
QNAPHybrid Backup Sync25.1.0.627Not 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
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
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:N/UI:N/S:U/C:H/I:H/A:H. Scored by NVD.

Scoring systemScoreSeverityScored by
CVSS 4.09.5CriticalCNA (qnapsecurity.com.tw)
CVSS 3.19.8CriticalNVD

Official description

An OS command injection vulnerability has been reported to affect HBS 3 Hybrid Backup Sync. If exploited, the vulnerability could allow remote attackers to execute commands. We have already fixed the vulnerability in the following version: HBS 3 Hybrid Backup Sync 25.1.1.673 and later

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

The underlying weakness: Improper Neutralization of Special Elements used in a Command

The product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component.

How developers prevent this class of flaw

  • If at all possible, use library calls rather than external processes to recreate the desired functionality.
  • If possible, ensure that all external commands called from the program are statically created.
  • Run time: Run time policy enforcement may be used in an allowlist fashion to prevent use of any non-sanctioned commands.

More Improper Neutralization of Special Elements used in a Command vulnerabilities (CWE-77)

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 HBS 3 Hybrid Backup Sync

All HBS 3 Hybrid Backup Sync vulnerabilities

Recent Improper Neutralization of Special Elements used in a Command vulnerabilities

Spotted an error? Tell us.