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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
Publisher: Juniper Networks
Operating System: Juniper
Impact/Access: Denial of Service -- Remote/Unauthenticated
CVE Names: CVE-2019-11479 CVE-2019-11478 CVE-2019-11477
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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
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.
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
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://
2020-10-14: Initial Publication.
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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