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2020-10 Security Bulletin: Junos OS and Junos OS Evolved: RPD can crash due to a slow memory leak. (CVE-2020-1678)

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Article ID: JSA11075 SECURITY_ADVISORIES Last Updated: 14 Oct 2020Version: 2.0
Product Affected:
This issue affects Junos OS 19.4, 20.1. This issue affects Junos OS Evolved 19.4-EVO, 20.1-EVO.
Problem:

On Juniper Networks Junos OS and Junos OS Evolved platforms with EVPN configured, receipt of specific BGP packets causes a slow memory leak. If the memory is exhausted the rpd process might crash.

If the issue occurs, the memory leak could be seen by executing the "show task memory detail | match policy | match evpn" command multiple times to check if memory (Alloc Blocks value) is increasing.

root@device> show task memory detail | match policy | match evpn
------------------------ Allocator Memory Report ------------------------
Name               | Size | Alloc DTXP Size | Alloc Blocks | Alloc Bytes | MaxAlloc Blocks | MaxAlloc Bytes
Policy EVPN Params     20                24        3330678      79936272           3330678         79936272

root@device> show task memory detail | match policy | match evpn
------------------------ Allocator Memory Report ------------------------
Name               | Size | Alloc DTXP Size | Alloc Blocks | Alloc Bytes | MaxAlloc Blocks | MaxAlloc Bytes
Policy EVPN Params     20                24       36620255     878886120          36620255       878886120

 

This issue affects:

Juniper Networks Junos OS

  • 19.4 versions prior to 19.4R2;
  • 20.1 versions prior to 20.1R1-S4, 20.1R2;

Juniper Networks Junos OS Evolved:

  • 19.4 versions;
  • 20.1 versions prior to 20.1R1-S4-EVO, 20.1R2-EVO;
  • 20.2 versions prior to 20.2R1-EVO;

This issue does not affect:

Juniper Networks Junos OS releases prior to 19.4R1.

Juniper Networks Junos OS Evolved releases prior to 19.4R1-EVO.

The example of the configuration stanza affected by this issue is as follows:

[protocols evpn]

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-2020-1678.

Solution:

The following software releases have been updated to resolve this specific issue:

Junos OS: 19.4R2, 19.4R3, 20.1R1-S4, 20.1R2, 20.2R1 and all subsequent releases.

Junos OS Evolved: 20.1R1-S4-EVO, 20.1R2-EVO, 20.2R1-EVO, and all subsequent releases.

This issue is being tracked as 1490269.

Workaround:

There are no viable workarounds for this issue.

Implementation:
Software releases or updates are available for download at https://www.juniper.net/support/downloads/.
Modification History:
2020-10-14: Initial Publication.
CVSS Score:
6.5 (CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
Severity Level:
Medium
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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