peter bassill · operator
$ cve CVE-2020-1938 JSON

CVE-2020-1938 KEV EXPLOIT

9.8
CRITICAL · CVSS 3.1 · EPSS 99.3% (pctl 100)

Patch first

On CISA KEV — known exploited in the wild, due 2022-03-17.

Description

When using the Apache JServ Protocol (AJP), care must be taken when trusting incoming connections to Apache Tomcat. Tomcat treats AJP connections as having higher trust than, for example, a similar HTTP connection. If such connections are available to an attacker, they can be exploited in ways that may be surprising. In Apache Tomcat 9.0.0.M1 to 9.0.0.30, 8.5.0 to 8.5.50 and 7.0.0 to 7.0.99, Tomcat shipped with an AJP Connector enabled by default that listened on all configured IP addresses. It was expected (and recommended in the security guide) that this Connector would be disabled if not required. This vulnerability report identified a mechanism that allowed: - returning arbitrary files from anywhere in the web application - processing any file in the web application as a JSP Further, if the web application allowed file upload and stored those files within the web application (or the attacker was able to control the content of the web application by some other means) then this, along with the ability to process a file as a JSP, made remote code execution possible. It is important to note that mitigation is only required if an AJP port is accessible to untrusted users. Users wishing to take a defence-in-depth approach and block the vector that permits returning arbitrary files and execution as JSP may upgrade to Apache Tomcat 9.0.31, 8.5.51 or 7.0.100 or later. A number of changes were made to the default AJP Connector configuration in 9.0.31 to harden the default configuration. It is likely that users upgrading to 9.0.31, 8.5.51 or 7.0.100 or later will need to make small changes to their configurations.

Scoring

CVSS9.8 (CRITICAL, v3.1)
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS99.27% — more likely to be exploited than 100% of all CVEs
On CISA KEVyes — remediate by 2022-03-17
Public exploityes
Published2020-02-24
Last modified2026-08-25

CISA KEV

NameApache Tomcat Improper Privilege Management Vulnerability
Added2022-03-03
Due2022-03-17
Vendor / productApache / Tomcat
Ransomware usenone reported

Affected (21)

VendorProduct
apachegeode
apachetomcat
blackberrygood control
blackberryworkspaces server
debiandebian linux
fedoraprojectfedora
netappdata availability services
netapponcommand system manager
opensuseleap
oracleagile engineering data management
oracleagile product lifecycle management
oraclecommunications element manager
oraclecommunications instant messaging server
oraclehealth sciences empirica inspections
oraclehealth sciences empirica signal
oraclehospitality guest access
oracleinstantis enterprisetrack
oraclemysql enterprise monitor
oraclesiebel ui framework
oracletransportation management
oracleworkload manager

Public exploits

SourceTitleDate
exploit-dbApache Tomcat - AJP 'Ghostcat' File Read/Inclusion (Metasploit)2020-11-13
exploit-dbApache Tomcat - AJP 'Ghostcat File Read/Inclusion2020-02-20

References

→ the Explorer  ·  watch your stack  ·  NVD