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2021-04 Security Bulletin: Junos OS: Memory leak when querying Aggregated Ethernet (AE) interface statistics (CVE-2021-0230)

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Article ID: JSA11125 SECURITY_ADVISORIES Last Updated: 22 Apr 2021Version: 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:

  • 17.1 versions 17.1R3 and above prior to 17.3R3-S11;
  • 17.4 versions prior to 17.4R3-S5;
  • 18.2 versions prior to 18.2R3-S7, 18.2R3-S8;
  • 18.3 versions prior to 18.3R3-S4;
  • 18.4 versions prior to 18.4R2-S7, 18.4R3-S6;
  • 19.1 versions prior to 19.1R3-S4;
  • 19.2 versions prior to 19.2R1-S6;
  • 19.3 versions prior to 19.3R3-S1;
  • 19.4 versions prior to 19.4R3-S1;
  • 20.1 versions prior to 20.1R2, 20.1R3;
  • 20.2 versions prior to 20.2R2-S2, 20.2R3;
  • 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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