CyberSecBulletin
CVE-2024-39944NVD status: Modified

IPC-HX8XXX and NVR4XXX: Allocation of Resources Without Limits or Throttling

Published Updated By the CyberSecBulletin desk

CVE-2024-39944 is a high-severity allocation of resources without limits or throttling vulnerability in IPC-HX8XXX and NVR4XXX from Dahua, with a CVSS 3.1 base score of 7.5 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. There is no confirmed exploitation so far. EPSS estimates a 0.56% 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 nvr4832-i to 2024.2.2 or a later version.
  2. Update ipc-hf8xxx_firmware to 2024.2.2 or a later version.
  3. Update ipc-hfw8xxx to 2024.2.2 or a later version.
  4. Read the advisory on dahuasecurity.com for workarounds and exact fixed builds.
  5. 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
DahuaIPC-HX8XXX and NVR4XXXNot specified in the recordNot stated
Dahuasecuritynvr4832-ibefore 2024.2.22024.2.2
Dahuasecurityipc-hf8xxx_firmwarebefore 2024.2.22024.2.2
Dahuasecurityipc-hfw8xxxbefore 2024.2.22024.2.2
DahuasecurityNvr4104-4ks2/l Firmwarebefore 4.003.0000000.1.r.2405154.003.0000000.1.r.240515
DahuasecurityNvr4108-4ks2/l Firmware4.003.0000000.1.r.240515Not stated
DahuasecurityNvr4116-4ks2/l Firmwarebefore 4.003.0000000.1.r.2405154.003.0000000.1.r.240515
DahuasecurityNvr4104-p-4ks2/l Firmwarebefore 4.003.0000000.1.r.2405154.003.0000000.1.r.240515
DahuasecurityNvr4108-p-4ks2/l Firmwarebefore 4.003.0000000.1.r.2405154.003.0000000.1.r.240515
DahuasecurityNvr4108-8p-4ks2/l Firmwarebefore 4.003.0000000.1.r.2405154.003.0000000.1.r.240515
DahuasecurityNvr4116-8p-4ks2/l Firmwarebefore 4.003.0000000.1.r.2405154.003.0000000.1.r.240515
DahuasecurityNvr4104hs-4ks2/l Firmwarebefore 4.003.0000000.1.r.2405154.003.0000000.1.r.240515
DahuasecurityNvr4108hs-4ks2/l Firmwarebefore 4.003.0000000.1.r.2405154.003.0000000.1.r.240515
DahuasecurityNvr4104hs-p-4ks2/l Firmwarebefore 4.003.0000000.1.r.2405154.003.0000000.1.r.240515
DahuasecurityNvr4108hs-p-4ks2/l Firmwarebefore 4.003.0000000.1.r.2405154.003.0000000.1.r.240515
DahuasecurityNvr4108hs-8p-4ks2/l Firmwarebefore 4.003.0000000.1.r.2405154.003.0000000.1.r.240515
DahuasecurityNvr4116hs-8p-4ks2/l Firmwarebefore 4.003.0000000.1.r.2405154.003.0000000.1.r.240515
DahuasecurityNvr4204-4ks2/l Firmwarebefore 4.003.0000000.1.r.2405154.003.0000000.1.r.240515
DahuasecurityNvr4208-4ks2/l Firmwarebefore 4.003.0000000.1.r.2405154.003.0000000.1.r.240515
DahuasecurityNvr4216-4ks2/l Firmwarebefore 4.003.0000000.1.r.2405154.003.0000000.1.r.240515
DahuasecurityNvr4204-p-4ks2/l Firmwarebefore 4.003.0000000.1.r.2405154.003.0000000.1.r.240515
DahuasecurityNvr4208-8p-4ks2/l Firmwarebefore 4.003.0000000.1.r.2405154.003.0000000.1.r.240515
DahuasecurityNvr4216-16p-4ks2/l Firmwarebefore 4.003.0000000.1.r.2405154.003.0000000.1.r.240515
DahuasecurityNvr4232-4ks2/l Firmwarebefore 4.003.0000000.1.r.2405154.003.0000000.1.r.240515
DahuasecurityNvr4232-16p-4ks2/l Firmwarebefore 4.003.0000000.1.r.2405154.003.0000000.1.r.240515

Version data comes from the organisation that assigned the CVE; 35 further products are omitted here. 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
NoneNo data is disclosed.
Integrity
NoneNothing can be modified.
Availability
HighThe component can be taken down completely.

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

Scoring systemScoreSeverityScored by
CVSS 3.17.5HighCNA (dahuatech.com)
CVSS 3.17.5HighNVD

Official description

A vulnerability has been found in Dahua products.Attackers can send carefully crafted data packets to the interface with vulnerabilities, causing the device to crash.

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

The underlying weakness: Allocation of Resources Without Limits or Throttling

The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.

How developers prevent this class of flaw

  • Clearly specify the minimum and maximum expectations for capabilities, and dictate which behaviors are acceptable when resource allocation reaches limits.
  • Limit the amount of resources that are accessible to unprivileged users. Set per-user limits for resources. Allow the system administrator to define these limits. Be careful to avoid CWE-410.
  • For any security checks that are performed on the client side, ensure that these checks are duplicated on the server side, in order to avoid CWE-602. Attackers can bypass the client-side checks by modifying values after the checks have been performed, or by changing the client to remove the client-side checks entirely. Then, these modified values would be submitted to the server.

More Allocation of Resources Without Limits or Throttling vulnerabilities (CWE-770)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: yes, technical impact: partial).
  3. Record last changed materially (score, affected products, status or references).

References

Recent Allocation of Resources Without Limits or Throttling vulnerabilities

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