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ubuntucveUbuntu.comUB:CVE-2021-45046
HistoryDec 14, 2021 - 12:00 a.m.

CVE-2021-45046

2021-12-1400:00:00
ubuntu.com
ubuntu.com
24

9 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

5.1 Medium

CVSS2

Access Vector

NETWORK

Access Complexity

HIGH

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

AV:N/AC:H/Au:N/C:P/I:P/A:P

0.974 High

EPSS

Percentile

99.9%

JSON

It was found that the fix to address CVE-2021-44228 in Apache Log4j 2.15.0
was incomplete in certain non-default configurations. This could allows
attackers with control over Thread Context Map (MDC) input data when the
logging configuration uses a non-default Pattern Layout with either a
Context Lookup (for example, $${ctx:loginId}) or a Thread Context Map
pattern (%X, %mdc, or %MDC) to craft malicious input data using a JNDI
Lookup pattern resulting in an information leak and remote code execution
in some environments and local code execution in all environments. Log4j
2.16.0 (Java 8) and 2.12.2 (Java 7) fix this issue by removing support for
message lookup patterns and disabling JNDI functionality by default.

Notes

Author Note
alexmurray Ubuntu 18.04 LTS is not affected since the JndiLookup.class was removed in the previous update for CVE-2021-44228
ebarretto above is also true for Ubuntu 16.04 ESM
OSVersionArchitecturePackageVersionFilename
ubuntu20.04noarchapache-log4j2< 2.16.0-0.20.04.1UNKNOWN
ubuntu21.04noarchapache-log4j2< 2.16.0-0.21.04.1UNKNOWN
ubuntu21.10noarchapache-log4j2< 2.16.0-0.21.10.1UNKNOWN

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9 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

5.1 Medium

CVSS2

Access Vector

NETWORK

Access Complexity

HIGH

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

AV:N/AC:H/Au:N/C:P/I:P/A:P

0.974 High

EPSS

Percentile

99.9%

JSON
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