CVE-2019-11478

high-risk

Published 2019-06-19

Jonathan Looney discovered that the TCP retransmission queue implementation in tcp_fragment in the Linux kernel could be fragmented when handling certain TCP Selective Acknowledgment (SACK) sequences. 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 f070ef2ac66716357066b683fb0baf55f8191a2e.

Do I need to act?

29.8% chance of exploitation in next 30 days

EPSS score — higher than 70% of all CVEs

Not on CISA KEV list

No confirmed active exploitation reported to CISA

Patch status unknown

Check vendor advisories for fix availability and mitigation guidance

CVSS 5.3/10 Medium

NETWORK / LOW complexity

Affected Products (20)

Linux Kernel

Big-Ip Advanced Firewall Manager

Big-Ip Access Policy Manager

Big-Ip Application Acceleration Manager

Big-Ip Link Controller

Big-Ip Policy Enforcement Manager

Big-Ip Webaccelerator

Big-Ip Application Security Manager

Big-Ip Local Traffic Manager

Big-Ip Fraud Protection Service

Big-Ip Global Traffic Manager

Affected Vendors

Redhat Linux F5 Canonical Pulsesecure Ivanti

References (58)

Third Party Advisory http://packetstormsecurity.com/files/153346/Kernel-Live-Patch-Security-Notice-LS...

http://packetstormsecurity.com/files/154408/Kernel-Live-Patch-Security-Notice-LS...

http://packetstormsecurity.com/files/154951/Kernel-Live-Patch-Security-Notice-LS...

http://www.arubanetworks.com/assets/alert/ARUBA-PSA-2020-010.txt

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.openwall.com/lists/oss-security/2019/10/24/1

http://www.openwall.com/lists/oss-security/2019/10/29/3

http://www.vmware.com/security/advisories/VMSA-2019-0010.html

https://access.redhat.com/errata/RHSA-2019:1594

https://access.redhat.com/errata/RHSA-2019:1602

https://access.redhat.com/errata/RHSA-2019:1699

Third Party Advisory https://access.redhat.com/security/vulnerabilities/tcpsack

https://cert-portal.siemens.com/productcert/pdf/ssa-462066.pdf

Mailing List https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/?id=f070ef2...

Patch https://github.com/Netflix/security-bulletins/blob/master/advisories/third-party...

Third Party Advisory https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44193

https://kc.mcafee.com/corporate/index?page=content&id=SB10287

https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2019-0007

and 38 more references

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high-risk

Severity 21/34 · High

Exploitability 15/34 · Moderate

Exposure 25/34 · High