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AUSCERT External Security Bulletin Redistribution
ESB-2021.1262
JSA11122 - 2021-04 Security Bulletin: Junos OS: SRX Series: Denial of
Service in J-Web upon receipt of a crafted HTTP packet
15 April 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: Junos OS: SRX Series
Publisher: Juniper Networks
Operating System: Juniper
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2021-0227
Original Bulletin:
http://kb.juniper.net/InfoCenter/index?page=content&id=JSA11122
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2021-04 Security Bulletin: Junos OS: SRX Series: Denial of Service in J-Web
upon receipt of a crafted HTTP packet (CVE-2021-0227)
Article ID : JSA11122
Last Updated: 14 Apr 2021
Version : 1.0
Product Affected:
This issue affects Junos OS 17.3, 17.4, 18.2, 18.3, 18.4, 19.1, 19.2, 19.3,
19.4, 20.1. Affected platforms: SRX Series.
Problem:
An improper restriction of operations within the bounds of a memory buffer
vulnerability in Juniper Networks Junos OS J-Web on SRX Series devices allows
an attacker to cause Denial of Service (DoS) by sending certain crafted HTTP
packets. Continued receipt and processing of these packets will create a
sustained Denial of Service (DoS) condition. When this issue occurs,
web-management, NTP daemon (ntpd) and Layer 2 Control Protocol process (L2CPD)
daemons might crash.
This issue affects Juniper Networks Junos OS on SRX Series:
o 17.3 versions prior to 17.3R3-S9;
o 17.4 versions prior to 17.4R2-S11, 17.4R3-S2;
o 18.2 versions prior to 18.2R3-S5;
o 18.3 versions prior to 18.3R2-S4, 18.3R3-S3;
o 18.4 versions prior to 18.4R2-S5, 18.4R3-S4;
o 19.1 versions prior to 19.1R3-S2;
o 19.2 versions prior to 19.2R1-S5, 19.2R3;
o 19.3 versions prior to 19.3R3;
o 19.4 versions prior to 19.4R2-S1, 19.4R3;
o 20.1 versions prior to 20.1R1-S2, 20.1R2;
The examples of the config stanza affected by this issue:
[system services web-management]
[system services web-management https]
[security dynamic-vpn]
Juniper SIRT is not aware of any malicious exploitation of this vulnerability.
This issue was found during internal product security testing or research.
This issue has been assigned CVE-2021-0227 .
Solution:
The following software releases have been updated to resolve this specific
issue: 17.3R3-S9, 17.4R2-S11, 17.4R3-S2, 18.2R3-S5, 18.3R2-S4, 18.3R3-S3,
18.4R2-S5, 18.4R3-S4, 19.1R3-S2, 19.2R1-S5, 19.2R3, 19.3R3, 19.4R2-S1, 19.4R3,
20.1R1-S2, 20.1R2, 20.2R1, and all subsequent releases.
This issue is being tracked as 1503557 .
Workaround:
There are no viable workarounds for this issue.
To reduce the risk of exploitation of this issue, 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:
2021-04-14: Initial Publication.
CVSS Score:
7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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."
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This security bulletin is provided as a service to AusCERT's members. As
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===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
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On call after hours for member emergencies only.
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