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AUSCERT External Security Bulletin Redistribution
ESB-2022.0197
JSA11253 - 2021-10 Security Bulletin: Junos OS: J-Web: A path traversal
vulnerability allows an authenticated attacker to elevate
their privileges to root (CVE-2021-31385)
17 January 2022
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AusCERT Security Bulletin Summary
---------------------------------
Product: Junos OS
Publisher: Juniper Networks
Operating System: Juniper
Impact/Access: Root Compromise -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-31385
Original Bulletin:
http://kb.juniper.net/InfoCenter/index?page=content&id=JSA11253
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2021-10 Security Bulletin: Junos OS: J-Web: A path traversal vulnerability allows
an authenticated attacker to elevate their privileges to root (CVE-2021-31385)
Article ID : JSA11253
Last Updated: 14 Jan 2022
Version : 2.0
Product Affected:
This issue affects Junos OS 12.3, 15.1, 18.3, 18.4, 19.1, 19.2, 19.3, 19.4,
20.1, 20.2, 20.3, 20.4, 21.1.
Problem:
An Improper Limitation of a Pathname to a Restricted Directory ('Path
Traversal') vulnerability in J-Web of Juniper Networks Junos OS allows any
low-privileged authenticated attacker to elevate their privileges to root.
This issue affects:
Juniper Networks Junos OS
o 12.3 versions prior to 12.3R12-S19;
o 15.1 versions prior to 15.1R7-S10;
o 18.3 versions prior to 18.3R3-S5;
o 18.4 versions prior to 18.4R3-S9;
o 19.1 versions prior to 19.1R3-S6;
o 19.2 versions prior to 19.2R1-S7, 19.2R3-S3;
o 19.3 versions prior to 19.3R3-S3;
o 19.4 versions prior to 19.4R3-S5;
o 20.1 versions prior to 20.1R2-S2, 20.1R3-S1;
o 20.2 versions prior to 20.2R3-S2;
o 20.3 versions prior to 20.3R3;
o 20.4 versions prior to 20.4R2-S1, 20.4R3;
o 21.1 versions prior to 21.1R1-S1, 21.1R2.
The following minimal configuration is necessary:
[system services web-management http]
or
[system services web-management https]
Juniper SIRT is not aware of any malicious exploitation of this vulnerability.
This issue was discovered during external security research.
This issue has been assigned CVE-2021-31385 .
Solution:
The following software releases have been updated to resolve this specific
issue: 12.3R12-S19, 15.1R7-S10, 18.3R3-S5, 18.4R3-S9, 19.1R3-S6, 19.2R1-S7,
19.2R3-S3, 19.3R3-S3, 19.4R3-S5, 20.1R2-S2, 20.1R3-S1, 20.2R3-S2, 20.3R3,
20.4R2-S1, 20.4R3, 21.1R1-S1, 21.1R2, 21.2R1, and all subsequent releases.
This issue is being tracked as 1591145 .
Workaround:
There are no viable workarounds for these issues other than disabling J-Web.
To reduce the risk of exploitation of these issues, use access lists or
firewall filters to limit access to only trusted administrative networks, hosts
and users.
Implementation:
Software releases or updates are available for download at https://
support.juniper.net/support/downloads/
Modification History:
2021-10-13: Initial Publication.
CVSS Score:
8.8 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
Severity Level:
High
Severity Assessment:
Information for how Juniper Networks uses CVSS can be found at KB 16446 "Common
Vulnerability Scoring System (CVSS) and Juniper's Security Advisories."
Acknowledgements:
Andy Coles of Microsoft MSRC Vulnerabilities and Mitigations Team
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