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             AUSCERT External Security Bulletin Redistribution

        JSA11053 - 2020-10 Security Bulletin: Junos OS: NFX Series:
            Multiple vulnerabilities resolved in 20.2R1 release
                              16 October 2020


        AusCERT Security Bulletin Summary

Product:           Junos OS
                   NFX Series
Publisher:         Juniper Networks
Operating System:  Juniper
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-11479 CVE-2019-11478 CVE-2019-11477

Reference:         ASB-2020.0017

Original Bulletin: 

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2020-10 Security Bulletin: Junos OS: NFX Series: Multiple vulnerabilities 
resolved in 20.2R1 release

Article ID  : JSA11053
Last Updated: 14 Oct 2020
Version     : 1.0

Product Affected:
This issue affects Junos OS versions prior to 20.2R1. Affected platforms: NFX


Multiple vulnerabilities have been resolved in Juniper Networks NFX Series by
updating third party software included with NFX Series devices.

These issues affect:

Juniper Networks NFX Series Network Services Platform versions prior to 20.2R1.

This issue is also known as SACK Panic, SACK Slowness.

Important security issues resolved include:

     CVE           CVSS                           Summary
               7.5 (        A bug in the non-default RACK TCP stack can allow
               CVSS:3.0/    an attacker to cause several linked lists to grow
CVE-2019-5599  AV:N/AC:L/   unbounded and cause an expensive list traversal on
               PR:N/UI:N/   every packet being processed, leading to resource
               S:U/C:N/I:N/ exhaustion and a denial of service.
               A:H )
                            Jonathan Looney discovered that the TCP_SKB_CB(skb)
               7.5 (        ->tcp_gso_segs value was subject to an integer
               CVSS:3.0/    overflow in the Linux kernel when handling TCP
               AV:N/AC:L/   Selective Acknowledgments (SACKs). A remote
CVE-2019-11477 PR:N/UI:N/   attacker could use this to cause a denial of
               S:U/C:N/I:N/ service. This has been fixed in stable kernel
               A:H )        releases 4.4.182, 4.9.182, 4.14.127, 4.19.52,
                            5.1.11, and is fixed in commit
                            Jonathan Looney discovered that the TCP
               7.5 (        retransmission queue implementation in tcp_fragment
               CVSS:3.0/    in the Linux kernel could be fragmented when
               AV:N/AC:L/   handling certain TCP Selective Acknowledgment
CVE-2019-11478 PR:N/UI:N/   (SACK) sequences. A remote attacker could use this
               S:U/C:N/I:N/ to cause a denial of service. This has been fixed
               A:H )        in stable kernel releases 4.4.182, 4.9.182,
                            4.14.127, 4.19.52, 5.1.11, and is fixed in commit
                            Jonathan Looney discovered that the Linux kernel
                            default MSS is hard-coded to 48 bytes. This allows
               7.5 (        a remote peer to fragment TCP resend queues
               CVSS:3.0/    significantly more than if a larger MSS were
CVE-2019-11479 AV:N/AC:L/   enforced. A remote attacker could use this to cause
               PR:N/UI:N/   a denial of service. This has been fixed in stable
               S:U/C:N/I:N/ kernel releases 4.4.182, 4.9.182, 4.14.127,
               A:H )        4.19.52, 5.1.11, and is fixed in commits
                            967c05aee439e6e5d7d805e195b3a20ef5c433d6 and


The following software releases have been updated to resolve these specific
issues: NFX Series: 20.2R1 and all subsequent releases.

This issue is being tracked as 1444420 .


There are no known workarounds for these issues.

Software releases or updates are available for download at https://
www.juniper.net/support/downloads/ .

Modification History:
2020-10-14: Initial Publication.

CVSS Score:
8.2 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H)

Severity Level:

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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