Description

Versions of the Amazon AWS Apache Log4j hotpatch package before log4j-cve-2021-44228-hotpatch-1.3.5 are affected by a race condition that could lead to a local privilege escalation. This Hotpatch package is not a replacement for updating to a log4j version that mitigates CVE-2021-44228 or CVE-2021-45046; it provides a temporary mitigation to CVE-2021-44228 by hotpatching the local Java virtual machines. To do so, it iterates through all running Java processes, performs several checks, and executes the Java virtual machine with the same permissions and capabilities as the running process to load the hotpatch. A local user could cause the hotpatch script to execute a binary with elevated privileges by running a custom java process that performs exec() of an SUID binary after the hotpatch has observed the process path and before it has observed its effective user ID.

Severity

 

CVSS Version 3.x CVSS Version 2.0

CVSS 3.x Severity and Metrics:

CNA:  MITRE

Base Score:  7.0 HIGH

Vector:  CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

NVD Analysts use publicly available information to associate vector strings and CVSS scores. We also display any CVSS information provided within the CVE List from the CNA.

Note: The NVD and the CNA have provided the same score. When this occurs only the CNA information is displayed, but the Acceptance Level icon for the CNA is given a checkmark to signify NVD concurrence.

CVSS 2.0 Severity and Metrics:

NIST: NVD

Base Score:  4.4 MEDIUM

Vector:  (AV:L/AC:M/Au:N/C:P/I:P/A:P)

NVD Analysts use publicly available information to associate vector strings and CVSS scores. We also display any CVSS information provided within the CVE List from the CNA.

Note: NVD Analysts have published a CVSS score for this CVE based on publicly available information at the time of analysis. The CNA has not provided a score within the CVE List.

References to Advisories, Solutions, and Tools

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Hyperlink	Resource
https://alas.aws.amazon.com/AL2/ALAS-2022-1806.html	Vendor Advisory
https://alas.aws.amazon.com/ALAS-2022-1601.html	Vendor Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-362	Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')	NIST

Known Affected Software Configurations Switch to CPE 2.2

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Change History

2 change records found show changes

Reanalysis by NIST 7/05/2022 3:43:40 PM

Action	Type	Old Value	New Value
Changed	CPE Configuration	OR *cpe:2.3:a:apache:log4j:*:*:*:*:*:*:*:* versions up to (excluding) log4j-cve-2021-44228-hotpatch-1.3-5	OR *cpe:2.3:a:amazon:hotpatch:*:*:*:*:*:log4j:*:* versions up to (excluding) 1.3.5

Initial Analysis by NIST 6/30/2022 2:30:03 PM

Action	Type	Old Value	New Value
Added	CPE Configuration		OR *cpe:2.3:a:apache:log4j:*:*:*:*:*:*:*:* versions up to (excluding) log4j-cve-2021-44228-hotpatch-1.3-5
Added	CVSS V2		NIST (AV:L/AC:M/Au:N/C:P/I:P/A:P)
Added	CVSS V3.1		NIST AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Added	CWE		NIST CWE-362
Changed	Reference Type	https://alas.aws.amazon.com/AL2/ALAS-2022-1806.html No Types Assigned	https://alas.aws.amazon.com/AL2/ALAS-2022-1806.html Vendor Advisory
Changed	Reference Type	https://alas.aws.amazon.com/ALAS-2022-1601.html No Types Assigned	https://alas.aws.amazon.com/ALAS-2022-1601.html Vendor Advisory