CyberSecBulletin
CVE-2024-55638NVD status: Analyzed

Drupal Core: Deserialization of Untrusted Data

Published Updated By the CyberSecBulletin desk

CVE-2024-55638 is a critical-severity deserialization of untrusted data vulnerability in Drupal Core from Drupal, 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 versions 7.102, 10.2.11, 10.3.9 as the first without the flaw, so updating Drupal Core to one of those releases or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.98% chance of exploitation within 30 days, higher than 63% of scored CVEs.

Patch this week

Critical severity: a successful attack would have severe impact.

What to do

  1. Update Drupal Core to 7.102 or 10.2.11 or 10.3.9, whichever matches your release line, or a later version.
  2. Update Drupal to 7.102 or 10.2.11 or 10.3.9, whichever matches your release line, or a later version.
  3. Read the advisory on drupal.org 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
DrupalDrupal Core7.0 up to, but not including, 7.102; 8.0.0 up to, but not including, 10.2.11; 10.3.0 up to, but not including, 10.3.97.102, 10.2.11, 10.3.9
DrupalDrupal7.0 up to, but not including, 7.102; 8.0.0 up to, but not including, 10.2.11; 10.3.0 up to, but not including, 10.3.97.102, 10.2.11, 10.3.9

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 CISA (ADP).

Official description

Deserialization of Untrusted Data vulnerability in Drupal Core allows Object Injection.This issue affects Drupal Core: from 7.0 before 7.102, from 8.0.0 before 10.2.11, from 10.3.0 before 10.3.9. Drupal core contains a chain of methods that is exploitable when an insecure deserialization vulnerability exists on the site. This so-called gadget chain presents no direct threat but is a vector that can be used to achieve remote code execution if the application deserializes untrusted data due to another vulnerability.

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

The underlying weakness: Deserialization of Untrusted Data

The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.

How developers prevent this class of flaw

  • If available, use the signing/sealing features of the programming language to assure that deserialized data has not been tainted. For example, a hash-based message authentication code (HMAC) could be used to ensure that data has not been modified.
  • When deserializing data, populate a new object rather than just deserializing. The result is that the data flows through safe input validation and that the functions are safe.
  • Explicitly define a final object() to prevent deserialization.

More Deserialization of Untrusted Data vulnerabilities (CWE-502)

Timeline

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

References

Other vulnerabilities in Drupal Core

All Drupal Core vulnerabilities

Recent Deserialization of Untrusted Data vulnerabilities

Spotted an error? Tell us.