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atlassianBturnerBSERV-13093
HistoryDec 17, 2021 - 7:03 p.m.

Upgrade Logback for CVE-2021-42550

2021-12-1719:03:40
bturner
jira.atlassian.com
13

8.5 High

CVSS2

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

SINGLE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

AV:N/AC:M/Au:S/C:C/I:C/A:C

6.6 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

HIGH

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

0.016 Low

EPSS

Percentile

87.3%

JSON

h3. Issue Summary

In the wake of Log4Shell, CVE-2021-42550 has been created for similar JNDI considerations in Logback. The Logback maintainers have removed some functionality from Logback in response and released Logback 1.2.9.

Please note: There is no RCE in Logback, and there is no vulnerability in Bitbucket Server or Logback’s default configurations. There is also no mechanism whereby a malicious client can attack the system. Exercising CVE-2021-42550 requires write access to Bitbucket Server’s Logback configuration.

h3. Workaround

Manually audit logging configuration and ensure proper permissions.

Affected configurations

Vulners
Node
atlassianbitbucket_data_centerRange≤6.10.0
OR
atlassianbitbucket_data_centerRange<7.20.0
OR
atlassianbitbucket_data_centerRange<6.10.17
OR
atlassianbitbucket_data_centerRange<7.6.13
OR
atlassianbitbucket_data_centerRange<7.19.2
OR
atlassianbitbucket_data_centerRange<7.17.5

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8.5 High

CVSS2

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

SINGLE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

AV:N/AC:M/Au:S/C:C/I:C/A:C

6.6 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

HIGH

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

0.016 Low

EPSS

Percentile

87.3%

JSON
Related for BSERV-13093
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