CVE-2020-13671

Drupal core: Un-restricted Upload of File

As of , CVE-2020-13671 in Drupal core is on CISA's list of exploited vulnerabilities: CISA listed it on . Our patch-first group: Patch soon.

Exploited
Yes: CISA listed it on 18 January 2022
US federal deadline
18 July 2022181 days after CISA listed it. US federal civilian agencies must fix it by then.
Used in ransomware campaigns
Not known to CISA
EPSS score
0.35Higher than 98% of the CVEs EPSS scores. EPSS estimates the chance of exploitation activity in the next 30 days.
EPSS when listed
Not availableCISA listed it before 4 February 2022, where the EPSS files we read begin.
Public exploit
None foundNeither Metasploit nor Exploit-DB lists one.
Fix
No vendor link in CISA's entry

What CISA says to do

Apply updates per vendor instructions.

CISA's required action

What the flaw is

Improper sanitization in the extension file names is present in Drupal core.

CISA's description

Drupal core does not properly sanitize certain filenames on uploaded files, which can lead to files being interpreted as the incorrect extension and served as the wrong MIME type or executed as PHP for certain hosting configurations. This issue affects: Drupal Drupal Core 9.0 versions prior to 9.0.8, 8.9 versions prior to 8.9.9, 8.8 versions prior to 8.8.11, and 7 versions prior to 7.74.

The CVE record's description, from drupal

CVE published
20 November 2020
Assigned by
drupal
CVSS
8.8 High (CVSS 3.1, from CISA-ADP)
CWE-434
Unrestricted Upload of File with Dangerous Type
CISA SSVC, exploitation
active
CISA SSVC, automatable
no
CISA SSVC, technical impact
total

Timeline

  1. The CVE record was published.
  2. CISA added it to its list of exploited vulnerabilities.
  3. The US federal deadline to fix it.

Drupal core: other exploited entries

VulnerabilityProductOur groupListedDeadlineEPSS
CVE-2018-7600Remote Code ExecutionDrupal Drupal CorePatch this weekRansomware use; Metasploit module; EPSS 0.99; verified Exploit-DB entry0.99

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