CyberSecBulletin
CVE-2022-25621NVD status: Modified

UNIVERGE DT: Improper Neutralization of Special Elements used in an OS Command

Published Updated By the CyberSecBulletin desk

CVE-2022-25621 is a critical-severity improper neutralization of special elements used in an OS command vulnerability in UNIVERGE DT from NEC Platforms, 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. There is no confirmed exploitation so far. EPSS estimates a 1.44% chance of exploitation within 30 days, higher than 74% of scored CVEs.

Patch this week

Critical severity: a successful attack would have severe impact.

What to do

  1. Check which version of UNIVERGE DT you run against the affected versions below, and install the vendor's latest release.
  2. Read the advisory on jpn.nec.com for workarounds and exact fixed builds.
  3. 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
NEC PlatformsUNIVERGE DTNot specified in the recordNot stated
NecUniverge Wa1020 Firmware8.2.11 and earlierNot stated
NecUniverge Wa1510 Firmware8.2.11 and earlierNot stated
NecUniverge Wa1511 Firmware8.2.11 and earlierNot stated
NecUniverge Wa1512 Firmware8.2.11 and earlierNot stated
NecUniverge Wa2020 Firmware8.2.11 and earlierNot stated
NecUniverge Wa2021 Firmware8.2.11 and earlierNot stated
NecUniverge Wa2610-ap Firmware8.2.11 and earlierNot stated
NecUniverge Wa2611-ap Firmware8.2.11 and earlierNot stated
NecUniverge Wa2611e-ap Firmware8.2.11 and earlierNot stated
NecUniverge Wa2612-ap Firmware8.2.11 and earlierNot 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 3.19.8CriticalNVD
CVSS 2.07.5HighNVD

Official description

UUNIVERGE WA 1020 Ver8.2.11 and prior, UNIVERGE WA 1510 Ver8.2.11 and prior, UNIVERGE WA 1511 Ver8.2.11 and prior, UNIVERGE WA 1512 Ver8.2.11 and prior, UNIVERGE WA 2020 Ver8.2.11 and prior, UNIVERGE WA 2021 Ver8.2.11 and prior, UNIVERGE WA 2610-AP Ver8.2.11 and prior, UNIVERGE WA 2611-AP Ver8.2.11 and prior, UNIVERGE WA 2611E-AP Ver8.2.11 and prior, UNIVERGE WA WA2612-AP Ver8.2.11 and prior allows a remote attacker to execute arbitrary OS commands.

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 an OS Command

The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command before 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.
  • For any data that will be used to generate a command to be executed, keep as much of that data out of external control as possible. For example, in web applications, this may require storing the data locally in the session's state instead of sending it out to the client in a hidden form field.
  • 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 Improper Neutralization of Special Elements used in an OS Command vulnerabilities (CWE-78)

Timeline

  1. CVE record published.
  2. Record last changed materially (score, affected products, status or references).

References

Recent Improper Neutralization of Special Elements used in an OS Command vulnerabilities

Spotted an error? Tell us.