Vulnerability CVE-2019-11477
Published: 2019-06-18   Modified: 2019-06-19

Description:
Jonathan Looney discovered that the TCP_SKB_CB(skb)->tcp_gso_segs value was subject to an integer overflow in the Linux kernel when handling TCP Selective Acknowledgments (SACKs). A remote attacker could use this to cause a denial of service. This has been fixed in stable kernel releases 4.4.182, 4.9.182, 4.14.127, 4.19.52, 5.1.11, and is fixed in commit 3b4929f65b0d8249f19a50245cd88ed1a2f78cff.

See advisories in our WLB2 database:
Topic
Author
Date
Med.
Linux / FreeBSD TCP-Based Denial Of Service
Jonathan Looney
19.06.2019

Type:

CWE-190

 (Integer Overflow or Wraparound)

CVSS2 => (AV:N/AC:L/Au:N/C:N/I:N/A:C)

CVSS Base Score
Impact Subscore
Exploitability Subscore
7.8/10
6.9/10
10/10
Exploit range
Attack complexity
Authentication
Remote
Low
No required
Confidentiality impact
Integrity impact
Availability impact
None
None
Complete
Affected software
Redhat -> Enterprise linux atomic host 
Redhat -> Enterprise mrg 
Redhat -> Enterprise linux 
Redhat -> Enterprise linux aus 
Redhat -> Enterprise linux eus 
Redhat -> Virtualization 
Pulsesecure -> Pulse policy secure 
Pulsesecure -> Pulse secure virtual application delivery controller 
Pulsesecure -> Pulse connect secure 
Linux -> Linux kernel 
F5 -> Big-ip access policy manager 
F5 -> Big-ip advanced firewall manager 
F5 -> Big-ip analytics 
F5 -> Big-ip application acceleration manager 
F5 -> Big-ip application security manager 
F5 -> Big-ip domain name system 
F5 -> Big-ip edge gateway 
F5 -> Big-ip fraud protection service 
F5 -> Big-ip global traffic manager 
F5 -> Big-ip link controller 
F5 -> Big-ip local traffic manager 
F5 -> Big-ip policy enforcement manager 
F5 -> Big-ip webaccelerator 
F5 -> Traffix sdc 
Canonical -> Ubuntu linux 

 References:
http://packetstormsecurity.com/files/153346/Kernel-Live-Patch-Security-Notice-LSN-0052-1.html
http://www.openwall.com/lists/oss-security/2019/06/20/3
https://access.redhat.com/errata/RHSA-2019:1594
https://access.redhat.com/errata/RHSA-2019:1602
https://access.redhat.com/security/vulnerabilities/tcpsack
https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/?id=3b4929f65b0d8249f19a50245cd88ed1a2f78cff
https://github.com/Netflix/security-bulletins/blob/master/advisories/third-party/2019-001.md
https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44193
https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2019-0006
https://security.netapp.com/advisory/ntap-20190625-0001/
https://support.f5.com/csp/article/K78234183
https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/SACKPanic
https://www.kb.cert.org/vuls/id/905115
https://www.synology.com/security/advisory/Synology_SA_19_28
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