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AUSCERT External Security Bulletin Redistribution
ESB-2021.3425
JSA11220 - 2021-10 Security Bulletin: Junos OS: Stored Cross-Site Scripting
(XSS) vulnerability in captive portal (CVE-2021-31355)
15 October 2021
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AusCERT Security Bulletin Summary
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Product: Junos OS
Publisher: Juniper Networks
Operating System: Juniper
Impact/Access: Cross-site Scripting -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-31355
Original Bulletin:
http://kb.juniper.net/InfoCenter/index?page=content&id=JSA11220
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2021-10 Security Bulletin: Junos OS: Stored Cross-Site Scripting (XSS) vulnerability in captive portal (CVE-2021-31355)
Article ID : JSA11220
Last Updated: 13 Oct 2021
Version : 1.0
Product Affected:
This issue affects all versions of Junos OS.
Problem:
A persistent cross-site scripting (XSS) vulnerability in the captive portal
graphical user interface of Juniper Networks Junos OS may allow a remote
authenticated user to inject web script or HTML and steal sensitive data and
credentials from a web administration session, possibly tricking a follow-on
administrative user to perform administrative actions on the device.
This issue affects Juniper Networks Junos OS:
o All versions, including the following supported releases:
12.3X48 versions prior to 12.3X48-D105;
15.1X49 versions prior to 15.1X49-D220;
18.3 versions prior to 18.3R3-S5;
18.4 versions prior to 18.4R3-S9;
19.1 versions prior to 19.1R3-S7;
19.2 versions prior to 19.2R3-S3;
19.3 versions prior to 19.3R3-S4;
19.4 versions prior to 19.4R3-S6;
20.1 versions prior to 20.1R3;
20.2 versions prior to 20.2R1-S1, 20.2R2;
20.3 versions prior to 20.3R2;
20.4 versions prior to 20.4R2;
21.1 versions prior to 21.1R2.
A sample configuration for Captive Portal is shown below:
[system services web-management http]
[set system services web-management https]
[services captive-portal secure-authentication 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-2021-31355 .
Solution:
The following software releases have been updated to resolve this specific
issue: Junos OS 12.3X48-D105, 15.1X49-D220, 18.3R3-S5, 18.4R3-S9, 19.1R3-S7,
19.2R3-S3, 19.3R3-S4, 19.4R3-S6, 20.1R3, 20.2R1-S1, 20.2R2, 20.3R2, 20.4R2,
21.1R2, 21.2R1 and all subsequent releases.
Additionally, after performing an upgrade to a resolved release, additional
steps must be taken to ensure that all stored malicious scripts are removed
from the configuration.
This issue is being tracked as 1449280 .
Workaround:
There are no viable workarounds for this issue.
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:
8.0 (CVSS:3.1/AV:N/AC:L/PR:L/UI:R/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:
Juniper SIRT would like to acknowledge and thank Fans0n Fan for responsibly
reporting this vulnerability.
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