Remote code execution in logback



Published: 2021-12-19
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-42550
CWE-ID CWE-94
Exploitation vector Network
Public exploit N/A
Vulnerable software
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Logback
Server applications / Other server solutions

Vendor QOS.ch

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Code Injection

EUVDB-ID: #VU59053

Risk: Medium

CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-42550

CWE-ID: CWE-94 - Improper Control of Generation of Code ('Code Injection')

Exploit availability: No

Description

The vulnerability allows a remote user to execute arbitrary code on the target system.

The vulnerability exists due to improper input validation. A remote user can send a specially crafted request to the application and execute arbitrary code on the target system by tricking the application to load a malicious configuration from a remote LDAP server.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Logback: 1.2.0 - 1.3.0 alpha10


CPE2.3 External links

http://github.com/cn-panda/logbackRceDemo
http://jira.qos.ch/browse/LOGBACK-1591
http://logback.qos.ch/news.html

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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