Debian update for apache-log4j2



| Updated: 2023-02-09
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-45105
CWE-ID CWE-835
Exploitation vector Network
Public exploit Public exploit code for vulnerability #1 is available.
Vulnerable software
 apache-log4j2 (Debian package)
Operating systems & Components / Operating system package or component

Vendor Debian

Security Bulletin

This security bulletin contains one medium risk vulnerability.

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

Update apache-log4j2 package to one of the following versions: 2.17.0-1~deb10u1, 2.17.0-1~deb11u1.

Vulnerable software versions

apache-log4j2 (Debian package): 2.0~beta9 - 2.16.0-1~deb11u1

CPE2.3 External links

https://www.debian.org/security/2021/dsa-5024


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.



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