CVE-2019-11479 Detail

Current 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.


View Analysis Description

Severity



CVSS 3.x Severity and Metrics:

NIST CVSS score
NIST: NVD
Base Score:  7.5 HIGH
Vector:  CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Nist CVSS score does not match with CNA score
CNA:  Canonical Ltd.
Base Score:  5.3 MEDIUM
Vector:  CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L


NVD Analysts use publicly available information to associate vector strings and CVSS scores. We also display any CVSS information provided within the CVE List from the CNA.

Note: It is possible that the NVD CVSS may not match that of the CNA. The most common reason for this is that publicly available information does not provide sufficient detail or that information simply was not available at the time the CVSS vector string was assigned.

References to Advisories, Solutions, and Tools

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Hyperlink Resource
http://www.openwall.com/lists/oss-security/2019/06/28/2
http://www.openwall.com/lists/oss-security/2019/07/06/3
http://www.openwall.com/lists/oss-security/2019/07/06/4
http://www.securityfocus.com/bid/108818 Third Party Advisory  VDB Entry 
https://access.redhat.com/errata/RHSA-2019:1594
https://access.redhat.com/errata/RHSA-2019:1602
https://access.redhat.com/errata/RHSA-2019:1699
https://access.redhat.com/security/vulnerabilities/tcpsack Third Party Advisory 
https://cert-portal.siemens.com/productcert/pdf/ssa-462066.pdf
https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/?id=5f3e2bf008c2221478101ee72f5cb4654b9fc363 Mailing List  Patch  Vendor Advisory 
https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/?id=967c05aee439e6e5d7d805e195b3a20ef5c433d6 Mailing List  Patch  Vendor Advisory 
https://github.com/Netflix/security-bulletins/blob/master/advisories/third-party/2019-001.md Patch  Third Party Advisory 
https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44193 Third Party Advisory 
https://kc.mcafee.com/corporate/index?page=content&id=SB10287
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 Third Party Advisory 
https://support.f5.com/csp/article/K35421172?utm_source=f5support&utm_medium=RSS
https://usn.ubuntu.com/4041-1/
https://usn.ubuntu.com/4041-2/
https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/SACKPanic Mitigation  Third Party Advisory 
https://www.kb.cert.org/vuls/id/905115
https://www.oracle.com/security-alerts/cpujan2020.html
https://www.synology.com/security/advisory/Synology_SA_19_28
https://www.us-cert.gov/ics/advisories/icsa-19-253-03
https://www.us-cert.gov/ics/advisories/icsma-20-170-06

Weakness Enumeration

CWE-ID CWE Name Source
CWE-400 Uncontrolled Resource Consumption cwe source acceptance level NIST  
CWE-405 Asymmetric Resource Consumption (Amplification) Reference acceptance level Canonical Ltd.  

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Change History

21 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2019-11479
NVD Published Date:
06/18/2019
NVD Last Modified:
06/19/2020
Source:
MITRE