CyberSecBulletin
CVE-2024-52508NVD status: Analyzed

security-advisories: Exposure of Sensitive Information to an Unauthorized Actor

Published Updated By the CyberSecBulletin desk

CVE-2024-52508 is a high-severity exposure of sensitive information to an unauthorized actor vulnerability in security-advisories from Nextcloud, with a CVSS 3.1 base score of 8.1 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, but only if a user takes part, for example by opening a link or file. Affected security-advisories versions: >= 1.9.0, < 1.14.6; >= 2.1.0, < 2.2.11; >= 3.1.0, < 3.6.3, and others listed below. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.75% chance of exploitation within 30 days, higher than 56% of scored CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Update nextcloud_mail to 1.14.6 or 2.2.11 or 3.6.3 or 15.4.0, whichever matches your release line, or a later version.
  2. Update Mail to 1.14.6 or 1.15.4 or 2.2.11 or 3.6.3, 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.
  5. Because the attack needs a user to take part, warn users about unexpected links and files related to this product until it is patched.

Affected products and versions

VendorProductAffected versionsFixed in
Nextcloudsecurity-advisories>= 1.9.0, < 1.14.6; >= 2.1.0, < 2.2.11; >= 3.1.0, < 3.6.3; >= 1.15.0, < 1.15.4; >= 3.7.0, < 3.7.7Not stated
Nextcloudnextcloud_mail1.9.0 up to, but not including, 1.14.6; 2.1.0 up to, but not including, 2.2.11; 3.1.0 up to, but not including, 3.6.3; 1.15.0 up to, but not including, 15.4.0; 3.7.0 up to, but not including, 3.7.71.14.6, 2.2.11, 3.6.3, 15.4.0, 3.7.7
NextcloudMail1.9.0 up to, but not including, 1.14.6; 1.15.0 up to, but not including, 1.15.4; 2.1.0 up to, but not including, 2.2.11; 3.1.0 up to, but not including, 3.6.3; 3.7.0 up to, but not including, 3.7.71.14.6, 1.15.4, 2.2.11, 3.6.3, 3.7.7

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
RequiredA user must take an action such as opening a file or link.
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
NoneAvailability is not affected.

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

Scoring systemScoreSeverityScored by
CVSS 3.18.2HighCNA (github.com)
CVSS 3.18.1HighNVD

Official description

Nextcloud Mail is the mail app for Nextcloud, a self-hosted productivity platform. When a user is trying to set up a mail account with an email address like [email protected] that does not support auto configuration, and an attacker managed to register autoconfig.tld, the used email details would be send to the server of the attacker. It is recommended that the Nextcloud Mail app is upgraded to 1.14.6, 1.15.4, 2.2.11, 3.6.3, 3.7.7 or 4.0.0.

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

The underlying weakness: Exposure of Sensitive Information to an Unauthorized Actor

The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.

How developers prevent this class of flaw

  • Compartmentalize the system to have safe areas where trust boundaries can be unambiguously drawn. Do not allow sensitive data to go outside of the trust boundary and always be careful when interfacing with a compartment outside of the safe area. Ensure that appropriate compartmentalization is built into the system design, and the compartmentalization allows for and reinforces privilege separation functionality. Architects and designers should rely on the principle of least privilege to decide the appropriate time to use privileges and the time to drop privileges.

More Exposure of Sensitive Information to an Unauthorized Actor vulnerabilities (CWE-200)

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 references

Other vulnerabilities in security-advisories

All security-advisories vulnerabilities

Recent Exposure of Sensitive Information to an Unauthorized Actor vulnerabilities

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