CVE-2021-31355: Junos OS: Stored Cross-Site Scripting (XSS) vulnerability in captive portal
First published: Tue Oct 19 2021(Updated: )
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: 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.
Credit: sirt@juniper.net
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Junos OS Evolved | =12.3x48 | |
| Junos OS Evolved | =12.3x48-d10 | |
| Junos OS Evolved | =12.3x48-d100 | |
| Junos OS Evolved | =12.3x48-d15 | |
| Junos OS Evolved | =12.3x48-d20 | |
| Junos OS Evolved | =12.3x48-d25 | |
| Junos OS Evolved | =12.3x48-d30 | |
| Junos OS Evolved | =12.3x48-d35 | |
| Junos OS Evolved | =12.3x48-d40 | |
| Junos OS Evolved | =12.3x48-d45 | |
| Junos OS Evolved | =12.3x48-d50 | |
| Junos OS Evolved | =12.3x48-d51 | |
| Junos OS Evolved | =12.3x48-d55 | |
| Junos OS Evolved | =12.3x48-d60 | |
| Junos OS Evolved | =12.3x48-d65 | |
| Junos OS Evolved | =12.3x48-d66 | |
| Junos OS Evolved | =12.3x48-d70 | |
| Junos OS Evolved | =12.3x48-d75 | |
| Junos OS Evolved | =12.3x48-d80 | |
| Junos OS Evolved | =12.3x48-d85 | |
| Junos OS Evolved | =12.3x48-d90 | |
| Junos OS Evolved | =12.3x48-d95 | |
| Junos OS Evolved | =15.1x49 | |
| Junos OS Evolved | =15.1x49-d10 | |
| Junos OS Evolved | =15.1x49-d100 | |
| Junos OS Evolved | =15.1x49-d110 | |
| Junos OS Evolved | =15.1x49-d120 | |
| Junos OS Evolved | =15.1x49-d130 | |
| Junos OS Evolved | =15.1x49-d131 | |
| Junos OS Evolved | =15.1x49-d140 | |
| Junos OS Evolved | =15.1x49-d15 | |
| Junos OS Evolved | =15.1x49-d150 | |
| Junos OS Evolved | =15.1x49-d160 | |
| Junos OS Evolved | =15.1x49-d170 | |
| Junos OS Evolved | =15.1x49-d180 | |
| Junos OS Evolved | =15.1x49-d190 | |
| Junos OS Evolved | =15.1x49-d20 | |
| Junos OS Evolved | =15.1x49-d200 | |
| Junos OS Evolved | =15.1x49-d210 | |
| Junos OS Evolved | =15.1x49-d25 | |
| Junos OS Evolved | =15.1x49-d30 | |
| Junos OS Evolved | =15.1x49-d35 | |
| Junos OS Evolved | =15.1x49-d40 | |
| Junos OS Evolved | =15.1x49-d45 | |
| Junos OS Evolved | =15.1x49-d50 | |
| Junos OS Evolved | =15.1x49-d55 | |
| Junos OS Evolved | =15.1x49-d60 | |
| Junos OS Evolved | =15.1x49-d65 | |
| Junos OS Evolved | =15.1x49-d70 | |
| Junos OS Evolved | =15.1x49-d75 | |
| Junos OS Evolved | =15.1x49-d80 | |
| Junos OS Evolved | =15.1x49-d90 | |
| Junos OS Evolved | =18.3 | |
| Junos OS Evolved | =18.3-r1 | |
| Junos OS Evolved | =18.3-r1-s1 | |
| Junos OS Evolved | =18.3-r1-s2 | |
| Junos OS Evolved | =18.3-r1-s3 | |
| Junos OS Evolved | =18.3-r1-s4 | |
| Junos OS Evolved | =18.3-r1-s5 | |
| Junos OS Evolved | =18.3-r1-s6 | |
| Junos OS Evolved | =18.3-r2 | |
| Junos OS Evolved | =18.3-r2-s1 | |
| Junos OS Evolved | =18.3-r2-s2 | |
| Junos OS Evolved | =18.3-r2-s3 | |
| Junos OS Evolved | =18.3-r3 | |
| Junos OS Evolved | =18.3-r3-s1 | |
| Junos OS Evolved | =18.3-r3-s2 | |
| Junos OS Evolved | =18.4 | |
| Junos OS Evolved | =18.4-r1 | |
| Junos OS Evolved | =18.4-r1-s1 | |
| Junos OS Evolved | =18.4-r1-s2 | |
| Junos OS Evolved | =18.4-r1-s3 | |
| Junos OS Evolved | =18.4-r1-s4 | |
| Junos OS Evolved | =18.4-r1-s5 | |
| Junos OS Evolved | =18.4-r1-s6 | |
| Junos OS Evolved | =18.4-r1-s7 | |
| Junos OS Evolved | =18.4-r2 | |
| Junos OS Evolved | =18.4-r2-s1 | |
| Junos OS Evolved | =18.4-r2-s2 | |
| Junos OS Evolved | =18.4-r2-s3 | |
| Junos OS Evolved | =18.4-r2-s4 | |
| Junos OS Evolved | =18.4-r3 | |
| Junos OS Evolved | =18.4-r3-s1 | |
| Junos OS Evolved | =18.4-r3-s2 | |
| Junos OS Evolved | =18.4-r3-s3 | |
| Junos OS Evolved | =19.1 | |
| Junos OS Evolved | =19.1-r1 | |
| Junos OS Evolved | =19.1-r1-s1 | |
| Junos OS Evolved | =19.1-r1-s2 | |
| Junos OS Evolved | =19.1-r1-s3 | |
| Junos OS Evolved | =19.1-r1-s4 | |
| Junos OS Evolved | =19.1-r1-s5 | |
| Junos OS Evolved | =19.1-r2 | |
| Junos OS Evolved | =19.1-r2-s1 | |
| Junos OS Evolved | =19.1-r3 | |
| Junos OS Evolved | =19.1-r3-s1 | |
| Junos OS Evolved | =19.2 | |
| Junos OS Evolved | =19.2-r1 | |
| Junos OS Evolved | =19.2-r1-s1 | |
| Junos OS Evolved | =19.2-r1-s2 | |
| Junos OS Evolved | =19.2-r1-s3 | |
| Junos OS Evolved | =19.2-r1-s4 | |
| Junos OS Evolved | =19.2-r2 | |
| Junos OS Evolved | =19.2-r2-s1 | |
| Junos OS Evolved | =19.3 | |
| Junos OS Evolved | =19.3-r1 | |
| Junos OS Evolved | =19.3-r1-s1 | |
| Junos OS Evolved | =19.3-r2 | |
| Junos OS Evolved | =19.3-r2-s1 | |
| Junos OS Evolved | =19.3-r2-s2 | |
| Junos OS Evolved | =19.3-r2-s3 | |
| Junos OS Evolved | =19.4-r1 | |
| Junos OS Evolved | =19.4-r1-s1 | |
| Junos OS Evolved | =19.4-r1-s2 | |
| Junos OS Evolved | =19.4-r2 | |
| Junos OS Evolved | =19.4-r2-s1 | |
| Junos OS Evolved | =20.1-r1 | |
| Junos OS Evolved | =20.1-r1-s1 | |
| Junos OS Evolved | =20.1-r1-s2 | |
| Junos OS Evolved | =20.1-r1-s3 | |
| Junos OS Evolved | =20.1-r1-s4 | |
| Junos OS Evolved | =20.1-r2 | |
| Junos OS Evolved | =20.1-r2-s1 | |
| Junos OS Evolved | =20.1-r2-s2 | |
| Junos OS Evolved | =20.2-r1 | |
| Junos OS Evolved | =20.2-r2 | |
| Junos OS Evolved | =20.3-r1 | |
| Junos OS Evolved | =20.3-r1-s1 | |
| Junos OS Evolved | =20.4-r1 | |
| Junos OS Evolved | =20.4-r1-s1 | |
| Junos OS Evolved | =21.1-r1 | |
| Junos OS Evolved | =21.1-r1-s1 |
Remedy
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.
Never miss a vulnerability like this again
Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.
Reference Links
Frequently Asked Questions
What is the severity of CVE-2021-31355?
CVE-2021-31355 is classified as a medium severity vulnerability due to its impact on user data confidentiality.
How do I fix CVE-2021-31355?
To fix CVE-2021-31355, update your Junos OS to the latest patched version released by Juniper Networks.
Who is affected by CVE-2021-31355?
CVE-2021-31355 affects Juniper Networks Junos OS versions 12.3x48, 15.1x49, 18.3, 18.4, and 19.x, among others.
What type of vulnerability is CVE-2021-31355?
CVE-2021-31355 is a persistent cross-site scripting (XSS) vulnerability.
Can CVE-2021-31355 lead to credential theft?
Yes, CVE-2021-31355 can allow attackers to inject scripts that steal sensitive data and credentials from web sessions.
- agent/type
- agent/author
- agent/weakness
- agent/references
- agent/title
- agent/severity
- agent/remedy
- agent/description
- collector/mitre-cve
- source/MITRE
- agent/last-modified-date
- agent/first-publish-date
- agent/event
- agent/source
- agent/softwarecombine
- agent/tags
- collector/nvd-index
- agent/software-canonical-lookup-request
- vendor/juniper
- canonical/junos os evolved
- version/junos os evolved/12.3x48
- version/junos os evolved/12.3x48-d10
- version/junos os evolved/12.3x48-d100
- version/junos os evolved/12.3x48-d15
- version/junos os evolved/12.3x48-d20
- version/junos os evolved/12.3x48-d25
- version/junos os evolved/12.3x48-d30
- version/junos os evolved/12.3x48-d35
- version/junos os evolved/12.3x48-d40
- version/junos os evolved/12.3x48-d45
- version/junos os evolved/12.3x48-d50
- version/junos os evolved/12.3x48-d51
- version/junos os evolved/12.3x48-d55
- version/junos os evolved/12.3x48-d60
- version/junos os evolved/12.3x48-d65
- version/junos os evolved/12.3x48-d66
- version/junos os evolved/12.3x48-d70
- version/junos os evolved/12.3x48-d75
- version/junos os evolved/12.3x48-d80
- version/junos os evolved/12.3x48-d85
- version/junos os evolved/12.3x48-d90
- version/junos os evolved/12.3x48-d95
- version/junos os evolved/15.1x49
- version/junos os evolved/15.1x49-d10
- version/junos os evolved/15.1x49-d100
- version/junos os evolved/15.1x49-d110
- version/junos os evolved/15.1x49-d120
- version/junos os evolved/15.1x49-d130
- version/junos os evolved/15.1x49-d131
- version/junos os evolved/15.1x49-d140
- version/junos os evolved/15.1x49-d15
- version/junos os evolved/15.1x49-d150
- version/junos os evolved/15.1x49-d160
- version/junos os evolved/15.1x49-d170
- version/junos os evolved/15.1x49-d180
- version/junos os evolved/15.1x49-d190
- version/junos os evolved/15.1x49-d20
- version/junos os evolved/15.1x49-d200
- version/junos os evolved/15.1x49-d210
- version/junos os evolved/15.1x49-d25
- version/junos os evolved/15.1x49-d30
- version/junos os evolved/15.1x49-d35
- version/junos os evolved/15.1x49-d40
- version/junos os evolved/15.1x49-d45
- version/junos os evolved/15.1x49-d50
- version/junos os evolved/15.1x49-d55
- version/junos os evolved/15.1x49-d60
- version/junos os evolved/15.1x49-d65
- version/junos os evolved/15.1x49-d70
- version/junos os evolved/15.1x49-d75
- version/junos os evolved/15.1x49-d80
- version/junos os evolved/15.1x49-d90
- version/junos os evolved/18.3
- version/junos os evolved/18.3-r1
- version/junos os evolved/18.3-r1-s1
- version/junos os evolved/18.3-r1-s2
- version/junos os evolved/18.3-r1-s3
- version/junos os evolved/18.3-r1-s4
- version/junos os evolved/18.3-r1-s5
- version/junos os evolved/18.3-r1-s6
- version/junos os evolved/18.3-r2
- version/junos os evolved/18.3-r2-s1
- version/junos os evolved/18.3-r2-s2
- version/junos os evolved/18.3-r2-s3
- version/junos os evolved/18.3-r3
- version/junos os evolved/18.3-r3-s1
- version/junos os evolved/18.3-r3-s2
- version/junos os evolved/18.4
- version/junos os evolved/18.4-r1
- version/junos os evolved/18.4-r1-s1
- version/junos os evolved/18.4-r1-s2
- version/junos os evolved/18.4-r1-s3
- version/junos os evolved/18.4-r1-s4
- version/junos os evolved/18.4-r1-s5
- version/junos os evolved/18.4-r1-s6
- version/junos os evolved/18.4-r1-s7
- version/junos os evolved/18.4-r2
- version/junos os evolved/18.4-r2-s1
- version/junos os evolved/18.4-r2-s2
- version/junos os evolved/18.4-r2-s3
- version/junos os evolved/18.4-r2-s4
- version/junos os evolved/18.4-r3
- version/junos os evolved/18.4-r3-s1
- version/junos os evolved/18.4-r3-s2
- version/junos os evolved/18.4-r3-s3
- version/junos os evolved/19.1
- version/junos os evolved/19.1-r1
- version/junos os evolved/19.1-r1-s1
- version/junos os evolved/19.1-r1-s2
- version/junos os evolved/19.1-r1-s3
- version/junos os evolved/19.1-r1-s4
- version/junos os evolved/19.1-r1-s5
- version/junos os evolved/19.1-r2
- version/junos os evolved/19.1-r2-s1
- version/junos os evolved/19.1-r3
- version/junos os evolved/19.1-r3-s1
- version/junos os evolved/19.2
- version/junos os evolved/19.2-r1
- version/junos os evolved/19.2-r1-s1
- version/junos os evolved/19.2-r1-s2
- version/junos os evolved/19.2-r1-s3
- version/junos os evolved/19.2-r1-s4
- version/junos os evolved/19.2-r2
- version/junos os evolved/19.2-r2-s1
- version/junos os evolved/19.3
- version/junos os evolved/19.3-r1
- version/junos os evolved/19.3-r1-s1
- version/junos os evolved/19.3-r2
- version/junos os evolved/19.3-r2-s1
- version/junos os evolved/19.3-r2-s2
- version/junos os evolved/19.3-r2-s3
- version/junos os evolved/19.4-r1
- version/junos os evolved/19.4-r1-s1
- version/junos os evolved/19.4-r1-s2
- version/junos os evolved/19.4-r2
- version/junos os evolved/19.4-r2-s1
- version/junos os evolved/20.1-r1
- version/junos os evolved/20.1-r1-s1
- version/junos os evolved/20.1-r1-s2
- version/junos os evolved/20.1-r1-s3
- version/junos os evolved/20.1-r1-s4
- version/junos os evolved/20.1-r2
- version/junos os evolved/20.1-r2-s1
- version/junos os evolved/20.1-r2-s2
- version/junos os evolved/20.2-r1
- version/junos os evolved/20.2-r2
- version/junos os evolved/20.3-r1
- version/junos os evolved/20.3-r1-s1
- version/junos os evolved/20.4-r1
- version/junos os evolved/20.4-r1-s1
- version/junos os evolved/21.1-r1
- version/junos os evolved/21.1-r1-s1