openEuler 20.03 LTS SP1 update for log4j

Published: 2022-09-23

Risk	Medium
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2021-45105 CVE-2021-44832
CWE-ID	CWE-835 CWE-94
Exploitation vector	Network
Public exploit	Public exploit code for vulnerability #1 is available.
Vulnerable software	openEuler Operating systems & Components / Operating system log4j-jcl Operating systems & Components / Operating system package or component log4j-help Operating systems & Components / Operating system package or component log4j-slf4j Operating systems & Components / Operating system package or component log4j-bom Operating systems & Components / Operating system package or component log4j-taglib Operating systems & Components / Operating system package or component log4j-web Operating systems & Components / Operating system package or component log4j-jmx-gui Operating systems & Components / Operating system package or component log4j Operating systems & Components / Operating system package or component
Vendor	openEuler

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Infinite loop

EUVDB-ID: #VU59051

Risk: Medium

CVSSv4.0: 7.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P/U:Green]

CVE-ID: CVE-2021-45105

CWE-ID: CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to infinite loop within the StrSubstitutor class. A remote attacker can pass specially crafted input to the application, consume all available system resources and cause denial of service conditions.

Payload example: ${${::-${::-$${::-j}}}}

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

openEuler: 20.03 LTS SP1

log4j-jcl: before 2.17.0-4

log4j-help: before 2.17.0-4

log4j-slf4j: before 2.17.0-4

log4j-bom: before 2.17.0-4

log4j-taglib: before 2.17.0-4

log4j-web: before 2.17.0-4

log4j-jmx-gui: before 2.17.0-4

log4j: before 2.17.0-4

CPE2.3

External links

https://www.openeuler.org/en/security/security-bulletins/detail/?id=openEuler-SA-2022-1956

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.

2) Code Injection

EUVDB-ID: #VU59098

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 - 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 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 repository.

Vulnerable software versions

openEuler: 20.03 LTS SP1

log4j-jcl: before 2.17.0-4

log4j-help: before 2.17.0-4

log4j-slf4j: before 2.17.0-4

log4j-bom: before 2.17.0-4

log4j-taglib: before 2.17.0-4

log4j-web: before 2.17.0-4

log4j-jmx-gui: before 2.17.0-4

log4j: before 2.17.0-4

CPE2.3

External links

https://www.openeuler.org/en/security/security-bulletins/detail/?id=openEuler-SA-2022-1956

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.