Vulnerability CVE-2019-11479


Published: 2019-06-18   Modified: 2019-06-19

Description:
Jonathan Looney discovered that the Linux kernel default MSS is hard-coded to 48 bytes. This allows a remote peer to fragment TCP resend queues significantly more than if a larger MSS were enforced. 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 commits 967c05aee439e6e5d7d805e195b3a20ef5c433d6 and 5f3e2bf008c2221478101ee72f5cb4654b9fc363.

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

Type:

CWE-400

(Uncontrolled Resource Consumption ('Resource Exhaustion'))

Vendor: Redhat
Product: Enterprise linux 
Version:
8.0
7.0
6.0
5.0
See more versions on NVD
Product: Enterprise linux eus 
Version: 7.5; 7.4;
Product: Enterprise linux aus 
Version: 6.6; 6.5;
Vendor: Linux
Product: Linux kernel 
Version:
5.1.6
5.1.5
5.1.4
5.1.3
5.1.2
5.1
5.0.9
5.0.8
5.0.7
5.0.4
5.0.2
5.0.15
5.0.11
5.0.10
5.0
4.9.99
4.9.98
4.9.97
4.9.96
4.9.95
4.9.94
4.9.93
4.9.92
4.9.91
4.9.90
4.9.9
4.9.89
4.9.88
4.9.87
4.9.86
4.9.85
4.9.84
4.9.83
4.9.82
4.9.81
4.9.80
4.9.8
4.9.79
4.9.78
4.9.77
4.9.76
4.9.75
4.9.74
4.9.73
4.9.72
4.9.71
4.9.70
4.9.7
4.9.69
4.9.68
4.9.67
4.9.66
4.9.65
4.9.64
4.9.63
4.9.62
4.9.61
4.9.60
4.9.6
4.9.59
4.9.58
4.9.57
4.9.56
4.9.55
4.9.54
4.9.53
4.9.52
4.9.51
4.9.50
4.9.5
4.9.49
4.9.48
4.9.47
4.9.46
4.9.45
4.9.44
4.9.43
4.9.42
4.9.41
4.9.40
4.9.4
4.9.39
4.9.38
4.9.37
4.9.36
4.9.35
4.9.34
4.9.33
4.9.32
4.9.31
4.9.30
4.9.3
See more versions on NVD

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

CVSS Base Score
Impact Subscore
Exploitability Subscore
5/10
2.9/10
10/10
Exploit range
Attack complexity
Authentication
Remote
Low
No required
Confidentiality impact
Integrity impact
Availability impact
None
None
Partial

 References:
http://www.securityfocus.com/bid/108818
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=5f3e2bf008c2221478101ee72f5cb4654b9fc363
https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/?id=967c05aee439e6e5d7d805e195b3a20ef5c433d6
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-2019-0008
https://security.netapp.com/advisory/ntap-20190625-0001/
https://support.f5.com/csp/article/K35421172
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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