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AUSCERT External Security Bulletin Redistribution
ESB-2021.1385
JSA11125 - 2021-04 Security Bulletin: Junos OS: Memory leak when querying
Aggregated Ethernet (AE) interface statistics (CVE-2021-0230)
23 April 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: Junos OS
Publisher: Juniper Networks
Operating System: Juniper
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2021-0230
Original Bulletin:
http://kb.juniper.net/InfoCenter/index?page=content&id=JSA11125
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2021-04 Security Bulletin: Junos OS: Memory leak when querying Aggregated Ethernet (AE) interface statistics (CVE-2021-0230)
Article ID : JSA11125
Last Updated: 22 Apr 2021
Version : 3.0
Product Affected:
This issue affects Junos OS 17.1 versions 17.1R3 and above prior to 17.3R3-S11,
17.4, 18.2, 18.3, 18.4, 19.1, 19.2, 19.3, 19.4, 20.1, 20.2, 20.3.
Problem:
On Juniper Networks Junos OS platforms with link aggregation (lag) configured,
executing any operation that fetches Aggregated Ethernet (AE) interface
statistics, including but not limited to SNMP GET requests, causes a slow
kernel memory leak. If all the available memory is consumed, the traffic will
be impacted and a reboot might be required.
The following log can be seen if this issue happens.
/kernel: rt_pfe_veto: Memory over consumed. Op 1 err 12, rtsm_id 0:-1, msg type
72
/kernel: rt_pfe_veto: free kmem_map memory = (20770816) curproc = kmd
An administrator can use the following CLI command to monitor the status of
memory consumption (ifstat bucket):
user@device > show system virtual-memory no-forwarding | match ifstat
Type InUse MemUse HighUse Limit Requests Limit Limit Size(s)
ifstat 2588977 162708K - 19633958 <<<<
user@device > show system virtual-memory no-forwarding | match ifstat
Type InUse MemUse HighUse Limit Requests Limit Limit Size(s)
ifstat 3021629 189749K - 22914415 <<<<
This issue does not affect the following platforms:
Juniper Networks MX Series.
Juniper Networks PTX1000-72Q, PTX3000, PTX5000, PTX10001, PTX10002-60C,
PTX10003_160C, PTX10003_80C, PTX10003_81CD, PTX10004, PTX10008, PTX10016
Series.
Juniper Networks EX9200 Series.
Juniper Networks ACX710, ACX6360 Series.
Juniper Networks NFX Series.
This issue affects Juniper Networks Junos OS:
o 17.1 versions 17.1R3 and above prior to 17.3R3-S11;
o 17.4 versions prior to 17.4R3-S5;
o 18.2 versions prior to 18.2R3-S7, 18.2R3-S8;
o 18.3 versions prior to 18.3R3-S4;
o 18.4 versions prior to 18.4R2-S7, 18.4R3-S6;
o 19.1 versions prior to 19.1R3-S4;
o 19.2 versions prior to 19.2R1-S6;
o 19.3 versions prior to 19.3R3-S1;
o 19.4 versions prior to 19.4R3-S1;
o 20.1 versions prior to 20.1R2, 20.1R3;
o 20.2 versions prior to 20.2R2-S2, 20.2R3;
o 20.3 versions prior to 20.3R1-S2, 20.3R2.
This issue does not affect Juniper Networks Junos OS prior to 17.1R3.
This issue affects Junos OS devices with link aggregation configured:
[interfaces <interface ID> {gigether-options {802.3ad <aggregate interface
ID>}}]
Juniper SIRT is not aware of any malicious exploitation of this vulnerability.
This issue was seen during production usage.
This issue has been assigned CVE-2021-0230 .
Solution:
The following software releases have been updated to resolve this specific
issue: 17.3R3-S11, 17.4R3-S5, 18.2R3-S7, 18.2R3-S8, 18.3R3-S4, 18.4R2-S7,
18.4R3-S6, 19.1R3-S4, 19.2R1-S6, 19.3R3-S1, 19.4R3-S1, 20.1R2, 20.1R3,
20.2R2-S2, 20.2R3, 20.3R1-S2, 20.3R2, 20.4R1, and all subsequent releases.
This issue is being tracked as 1528605 .
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:
2021-04-14: Initial Publication.
2021-04-22: List of platforms which are not affected from this issue has been updated.
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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