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CVE-2019-11479

MEDIUM
Published 2019-06-18T23:34:51.124134Z
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CVSS Score

V3.0
5.3
/10
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Base Score Metrics
Exploitability: N/A Impact: N/A

EPSS Score

v2023.03.01
0.966
probability
of exploitation in the wild

There is a 96.6% chance that this vulnerability will be exploited in the wild within the next 30 days.

Updated: 2025-01-25
Exploit Probability
Percentile: 0.998
Higher than 99.8% of all CVEs

Attack Vector Metrics

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED

Impact Metrics

Confidentiality
NONE
Integrity
NONE
Availability
LOW

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.

Available Exploits

No exploits available for this CVE.

Related News

No news articles found for this CVE.

Affected Products

Linux

Linux kernel

Affected Versions:

4.4 4.9 4.14 4.19 5.1

GitHub Security Advisories

Community-driven vulnerability intelligence from GitHub

⚠ Unreviewed HIGH

GHSA-99cq-xr7g-h22w

Advisory Details

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.

CVSS Scoring

CVSS Score

7.5

CVSS Vector

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

References

ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2019-11479
WEB https://www.us-cert.gov/ics/advisories/icsma-20-170-06
WEB https://www.us-cert.gov/ics/advisories/icsa-19-253-03
WEB https://www.synology.com/security/advisory/Synology_SA_19_28
WEB https://www.oracle.com/security-alerts/cpuoct2020.html
WEB https://www.oracle.com/security-alerts/cpujan2020.html
WEB https://www.kb.cert.org/vuls/id/905115
WEB https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/SACKPanic
WEB https://usn.ubuntu.com/4041-2
WEB https://usn.ubuntu.com/4041-1
WEB https://support.f5.com/csp/article/K35421172?utm_source=f5support&utm_medium=RSS
WEB https://support.f5.com/csp/article/K35421172
WEB https://security.netapp.com/advisory/ntap-20190625-0001
WEB https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2019-0008
WEB https://kc.mcafee.com/corporate/index?page=content&id=SB10287
WEB https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44193
WEB https://github.com/Netflix/security-bulletins/blob/master/advisories/third-party/2019-001.md
WEB https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/?id=967c05aee439e6e5d7d805e195b3a20ef5c433d6
WEB https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/?id=5f3e2bf008c2221478101ee72f5cb4654b9fc363
WEB https://cert-portal.siemens.com/productcert/pdf/ssa-462066.pdf
WEB https://access.redhat.com/security/vulnerabilities/tcpsack
WEB https://access.redhat.com/errata/RHSA-2019:1699
WEB https://access.redhat.com/errata/RHSA-2019:1602
WEB https://access.redhat.com/errata/RHSA-2019:1594
WEB http://www.arubanetworks.com/assets/alert/ARUBA-PSA-2020-010.txt
WEB http://www.openwall.com/lists/oss-security/2019/06/28/2
WEB http://www.openwall.com/lists/oss-security/2019/07/06/3
WEB http://www.openwall.com/lists/oss-security/2019/07/06/4
WEB http://www.securityfocus.com/bid/108818

Advisory provided by GitHub Security Advisory Database. Published: May 24, 2022, Modified: August 16, 2023

References

http://www.securityfocus.com/bid/108818
https://www.kb.cert.org/vuls/id/905115
https://access.redhat.com/errata/RHSA-2019:1594
https://access.redhat.com/errata/RHSA-2019:1602
http://www.openwall.com/lists/oss-security/2019/06/28/2
https://usn.ubuntu.com/4041-2/
http://www.openwall.com/lists/oss-security/2019/07/06/3
http://www.openwall.com/lists/oss-security/2019/07/06/4
https://access.redhat.com/errata/RHSA-2019:1699
https://usn.ubuntu.com/4041-1/
https://www.oracle.com/security-alerts/cpujan2020.html
https://www.oracle.com/security-alerts/cpuoct2020.html
https://github.com/Netflix/security-bulletins/blob/master/advisories/third-party/2019-001.md
https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/SACKPanic
https://access.redhat.com/security/vulnerabilities/tcpsack
https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44193
https://www.synology.com/security/advisory/Synology_SA_19_28
https://security.netapp.com/advisory/ntap-20190625-0001/
https://kc.mcafee.com/corporate/index?page=content&id=SB10287
https://cert-portal.siemens.com/productcert/pdf/ssa-462066.pdf
https://www.us-cert.gov/ics/advisories/icsa-19-253-03
http://www.arubanetworks.com/assets/alert/ARUBA-PSA-2020-010.txt
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://support.f5.com/csp/article/K35421172
https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2019-0008
https://support.f5.com/csp/article/K35421172?utm_source=f5support&amp%3Butm_medium=RSS
https://www.us-cert.gov/ics/advisories/icsma-20-170-06
Published: 2019-06-18T23:34:51.124134Z
Last Modified: 2024-09-16T23:22:00.170Z
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