#VU59098 Code Injection in Apache Log4j - CVE-2021-44832

Vulnerability identifier: #VU59098

Vulnerability risk: Medium

CVSSv4.0: 4.8 [CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-44832

CWE-ID: CWE-94

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Apache Log4j
Universal components / Libraries / Libraries used by multiple products

Vendor: Apache Foundation

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 with permission to modify the logging configuration file can construct a malicious configuration using a JDBC Appender with a data source referencing a JNDI URI which can execute remote code.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Apache Log4j: 2.0 - 2.17.0

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External links
https://lists.apache.org/thread/s1o5vlo78ypqxnzn6p8zf6t9shtq5143
https://issues.apache.org/jira/browse/LOG4J2-3293
https://logging.apache.org/log4j/2.x/security.html

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Q & A

Can this vulnerability be exploited remotely?

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

Is there known malware, which exploits this vulnerability?

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