CyberSecBulletin
CVE-2024-37313NVD status: Analyzed

security-advisories: Improper Authentication

Published Updated By the CyberSecBulletin desk

CVE-2024-37313 is a high-severity improper authentication vulnerability in security-advisories from Nextcloud, 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. Affected security-advisories versions: >= 26.0.0, < 26.0.13; >= 27.0.0, < 27.1.8; >= 28.0.0, < 28.0.4. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.4% 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 server to 26.0.13 or 27.1.8 or 28.0.4, whichever matches your release line, or a later version.
  2. Update Nextcloud Server to 21.0.9.17 or 22.2.10.22 or 23.0.12.17 or 24.0.12.13, whichever matches your release line, or a later version.
  3. Read the advisory on github.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
Nextcloudsecurity-advisories>= 26.0.0, < 26.0.13; >= 27.0.0, < 27.1.8; >= 28.0.0, < 28.0.4Not stated
Nextcloudserver26.0.0 up to, but not including, 26.0.13; 27.0.0 up to, but not including, 27.1.8; 28.0.0 up to, but not including, 28.0.426.0.13, 27.1.8, 28.0.4
NextcloudNextcloud Server21.0.0 up to, but not including, 21.0.9.17; 22.0.0 up to, but not including, 22.2.10.22; 23.0.0 up to, but not including, 23.0.12.17; 24.0.0 up to, but not including, 24.0.12.13; 25.0.0 up to, but not including, 25.0.13.8; 26.0.0 up to, but not including, 26.0.13; 27.0.0 up to, but not including, 27.1.8; 28.0.0 up to, but not including, 28.0.421.0.9.17, 22.2.10.22, 23.0.12.17, 24.0.12.13, 25.0.13.8, 26.0.13

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
NoneNo data is disclosed.
Integrity
HighData or code can be modified at will.
Availability
NoneAvailability is not affected.

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

Scoring systemScoreSeverityScored by
CVSS 3.17.3HighCNA (github.com)
CVSS 3.17.5HighNVD

Official description

Nextcloud server is a self hosted personal cloud system. Under some circumstance it was possible to bypass the second factor of 2FA after successfully providing the user credentials. It is recommended that the Nextcloud Server is upgraded to 26.0.13, 27.1.8 or 28.0.4 and Nextcloud Enterprise Server is upgraded to 21.0.9.17, 22.2.10.22, 23.0.12.17, 24.0.12.13, 25.0.13.8, 26.0.13, 27.1.8 or 28.0.4.

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

The underlying weakness: Improper Authentication

When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.

How developers prevent this class of flaw

  • Use an authentication framework or library such as the OWASP ESAPI Authentication feature.

More Improper Authentication vulnerabilities (CWE-287)

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

Patches and release notes

Other references

Other vulnerabilities in security-advisories

All security-advisories vulnerabilities

Recent Improper Authentication vulnerabilities

Spotted an error? Tell us.