CVE-2021-42550

Public Exploit
RCE from attacker with configuration edit priviledges through JNDI lookup

Description

In logback version 1.2.7 and prior versions, an attacker with the required privileges to edit configurations files could craft a malicious configuration allowing to execute arbitrary code loaded from LDAP servers.

Remediation

Solution:

  • upgrade to >=1.2.9 or >=1.3.0-alpha11

Category

6.6
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 2.0 •
EPSS 1.99% Top 20%
Vendor Advisory qos.ch
Affected: QOS.ch logback
Published at:
Updated at:

References

Link Tags
http://logback.qos.ch/news.html vendor advisory
https://github.com/cn-panda/logbackRceDemo third party advisory exploit
https://jira.qos.ch/browse/LOGBACK-1591 issue tracking patch exploit third party advisory
https://security.netapp.com/advisory/ntap-20211229-0001/ third party advisory
http://seclists.org/fulldisclosure/2022/Jul/11 third party advisory mailing list
http://packetstormsecurity.com/files/167794/Open-Xchange-App-Suite-7.10.x-Cross-Site-Scripting-Command-Injection.html exploit vdb entry third party advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-371761.pdf third party advisory

Frequently Asked Questions

What is the severity of CVE-2021-42550?
CVE-2021-42550 has been scored as a medium severity vulnerability.
How to fix CVE-2021-42550?
To fix CVE-2021-42550: upgrade to >=1.2.9 or >=1.3.0-alpha11
Is CVE-2021-42550 being actively exploited in the wild?
It is possible that CVE-2021-42550 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~2% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-42550?
CVE-2021-42550 affects QOS.ch logback.
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