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AUSCERT External Security Bulletin Redistribution
ESB-2024.2239
2024-04 Security Bulletin: Junos OS Evolved: libslax: Multiple
vulnerabilities in libslax resolved
11 April 2024
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AusCERT Security Bulletin Summary
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Product: Junos OS Evolved
Publisher: Juniper Networks
Operating System: Juniper
Resolution: Patch/Upgrade
CVE Names: CVE-2021-39533 CVE-2021-39534 CVE-2021-39531
Original Bulletin:
https://supportportal.juniper.net/s/article/2024-04-Security-Bulletin-Junos-OS-Evolved-libslax-Multiple-vulnerabilities-in-libslax-resolved
Comment: CVSS (Max): 8.8 CVE-2021-39531 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H)
CVSS Source: Juniper Networks
Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- --------------------------BEGIN INCLUDED TEXT--------------------
Article ID: JSA79102
Product Affected: These issues affect all versions of Junos OS Evolved before
22.3R3-S2-EVO, 22.4-EVO.
Severity Level: High
CVSS Score: CVSS 3.1
Problem:
Multiple vulnerabilities are resolved in libslax 0.22.1.
These issues affect Juniper Networks Junos OS Evolved:
o All versions before 22.3R3-S2-EVO
o from 22.4 before 22.4R2-EVO.
Important security issues resolved are described below:
+--------------+--------------------+-----------------------------------------+
| CVE | CVSS | Summary |
+--------------+--------------------+-----------------------------------------+
| |8.8 ( CVSS:3.1/AV:N/|An issue was discovered in libslax |
|CVE-2021-39531|AC:L/PR:N/UI:R/S:U/ |through v0.22.1. slaxLexer() in |
| |C:H/I:H/A:H ) |slaxlexer.c has a stack-based buffer |
| | |overflow. |
+--------------+--------------------+-----------------------------------------+
| |8.8 ( CVSS:3.1/AV:N/|An issue was discovered in libslax |
|CVE-2021-39533|AC:L/PR:N/UI:R/S:U/ |through v0.22.1. slaxLexer() in |
| |C:H/I:H/A:H ) |slaxlexer.c has a heap-based buffer |
| | |overflow. |
+--------------+--------------------+-----------------------------------------+
| |8.8 ( CVSS:3.1/AV:N/|An issue was discovered in libslax |
|CVE-2021-39534|AC:L/PR:N/UI:R/S:U/ |through v0.22.1. slaxIsCommentStart() in |
| |C:H/I:H/A:H ) |slaxlexer.c has a heap-based buffer |
| | |overflow. |
+--------------+--------------------+-----------------------------------------+
Solution:
The following software releases have been updated to resolve these specific
issues:
Junos OS Evolved: 22.3R3-S2-EVO, 22.4R2-EVO, 22.4R3-EVO, 23.2R1-EVO, and all
subsequent releases.
These issues are being tracked as 1698495 which are visible on the Customer
Support website.
Note: Juniper SIRT's policy is not to evaluate releases which are beyond End of
Engineering (EOE) or End of Life (EOL).
Workaround:
There are no known workarounds for these issues.
Modification History:
o 2024-04-10 - Initial Publication
Related Information:
o KB16613: Overview of the Juniper Networks SIRT Quarterly Security Bulletin
Publication Process
o KB16765: In which releases are vulnerabilities fixed?
o KB16446: Common Vulnerability Scoring System (CVSS) and Juniper's Security
Advisories
o Report a Security Vulnerability - How to Contact the Juniper Networks
Security Incident Response Team
Last Updated: 2024-04-10
Created: 2024-04-10
- --------------------------END INCLUDED TEXT----------------------
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