CVE-2019-11478: SACK can cause extensive memory use via fragmented resend queue

Published Jun 11, 2019
·
Updated

An excessive resource consumption flaw was found in the way the Linux kernel's networking subsystem processed TCP Selective Acknowledgment (SACK) segments. While processing SACK segments, the Linux kernel's socket buffer (SKB) data structure becomes fragmented, which leads to increased resource utilization to traverse and process these fragments as further SACK segments are received on the same TCP connection. A remote attacker could use this flaw to cause a denial of service (DoS) by sending a crafted sequence of SACK segments on a TCP connection.

Other sources

An excessive resource(CPU/Memory etc.) consumption issue was found in the way Linux kernel processes TCP Selective Acknowledgement(SACK) segments. While processing SACK segments, Linux kernel's socket buffer(SBK) data structure becomes fragmented. SKB is also used as retransmission queue. This fragmentation leads to increased resource utilisation to traverse and process these fragments, as further SACK segments are received on the same TCP connection.

A remote attacker could use this flaw to cause a DoS by sending a crafted sequence of SACK segments on a TCP connection.

Upstream patch: --------------- -> https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/?id=f070ef2ac66716357066b683fb0baf55f8191a2e

Reference: ---------- -> https://www.ietf.org/rfc/rfc2018.txt -> http://vger.kernel.org/~davem/skbdata.html

— Red Hat

Jonathan Looney discovered that the TCP retransmission queue implementation in tcpfragment 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.

Affected Software

145 affected componentsFixes available
redhat/kernel<0:2.6.32-754.15.3.el6
0:2.6.32-754.15.3.el6
redhat/kernel<0:2.6.32-431.95.3.el6
0:2.6.32-431.95.3.el6
redhat/kernel<0:2.6.32-504.79.3.el6
0:2.6.32-504.79.3.el6
redhat/kernel-rt<0:3.10.0-957.21.3.rt56.935.el7
0:3.10.0-957.21.3.rt56.935.el7
redhat/kernel<0:3.10.0-957.21.3.el7
0:3.10.0-957.21.3.el7
redhat/kernel-alt<0:4.14.0-115.8.2.el7a
0:4.14.0-115.8.2.el7a
redhat/kernel<0:3.10.0-327.79.2.el7
0:3.10.0-327.79.2.el7
redhat/kernel<0:3.10.0-514.66.2.el7
0:3.10.0-514.66.2.el7
redhat/kernel<0:3.10.0-693.50.3.el7
0:3.10.0-693.50.3.el7
redhat/kernel<0:3.10.0-862.34.2.el7
0:3.10.0-862.34.2.el7
redhat/kernel-rt<0:4.18.0-80.4.2.rt9.152.el8_0
0:4.18.0-80.4.2.rt9.152.el8_0
redhat/kernel<0:4.18.0-80.4.2.el8_0
0:4.18.0-80.4.2.el8_0
redhat/kernel-rt<1:3.10.0-693.50.3.rt56.644.el6
1:3.10.0-693.50.3.rt56.644.el6
redhat/redhat-release-virtualization-host<0:4.2-11.1.el7
0:4.2-11.1.el7
redhat/redhat-virtualization-host<0:4.2-20190618.0.el7_6
0:4.2-20190618.0.el7_6
redhat/redhat-release-virtualization-host<0:4.3.4-1.el7e
0:4.3.4-1.el7e
redhat/redhat-virtualization-host<0:4.3.4-20190620.3.el7_6
0:4.3.4-20190620.3.el7_6
Linux Linux kernel<4.4.182
Linux Linux kernel>=4.5<4.9.182
Linux Linux kernel>=4.10<4.14.127
Linux Linux kernel>=4.15<4.19.52
Linux Linux kernel>=4.20<5.1.11
F5 BIG-IP Advanced Firewall Manager>=11.5.2<=11.6.4
F5 BIG-IP Advanced Firewall Manager>=12.1.0<=12.1.4
F5 BIG-IP Advanced Firewall Manager>=13.1.0<=13.1.1
F5 BIG-IP Advanced Firewall Manager>=14.0.0<=14.1.0
F5 BIG-IP Advanced Firewall Manager=15.0.0
F5 BIG-IP Access Policy Manager>=11.5.2<=11.6.4
F5 BIG-IP Access Policy Manager>=12.1.0<=12.1.4
F5 BIG-IP Access Policy Manager>=13.1.0<=13.1.1
F5 BIG-IP Access Policy Manager>=14.0.0<=14.1.0
F5 BIG-IP Access Policy Manager=15.0.0
F5 Big-ip Application Acceleration Manager>=11.5.2<=11.6.4
F5 Big-ip Application Acceleration Manager>=12.1.0<=12.1.4
F5 Big-ip Application Acceleration Manager>=13.1.0<=13.1.1
F5 Big-ip Application Acceleration Manager>=14.0.0<=14.1.0
F5 Big-ip Application Acceleration Manager=15.0.0
F5 Big-ip Link Controller>=11.5.2<=11.6.4
F5 Big-ip Link Controller>=12.1.0<=12.1.4
F5 Big-ip Link Controller>=13.1.0<=13.1.1
F5 Big-ip Link Controller>=14.0.0<=14.1.0
F5 Big-ip Link Controller=15.0.0
F5 Big-ip Policy Enforcement Manager>=11.5.2<=11.6.4
F5 Big-ip Policy Enforcement Manager>=12.1.0<=12.1.4
F5 Big-ip Policy Enforcement Manager>=13.1.0<=13.1.1
F5 Big-ip Policy Enforcement Manager>=14.0.0<=14.1.0
F5 Big-ip Policy Enforcement Manager=15.0.0
F5 Big-ip Webaccelerator>=11.5.2<=11.6.4
F5 Big-ip Webaccelerator>=12.1.0<=12.1.4
F5 Big-ip Webaccelerator>=13.1.0<=13.1.1
F5 Big-ip Webaccelerator>=14.0.0<=14.1.0
F5 Big-ip Webaccelerator=15.0.0
F5 BIG-IP Application Security Manager>=11.5.2<=11.6.4
F5 BIG-IP Application Security Manager>=12.1.0<=12.1.4
F5 BIG-IP Application Security Manager>=13.1.0<=13.1.1
F5 BIG-IP Application Security Manager>=14.0.0<=14.1.0
F5 BIG-IP Application Security Manager=15.0.0
F5 Big-ip Local Traffic Manager>=11.5.2<=11.6.4
F5 Big-ip Local Traffic Manager>=12.1.0<=12.1.4
F5 Big-ip Local Traffic Manager>=13.1.0<=13.1.1
F5 Big-ip Local Traffic Manager>=14.0.0<=14.1.0
F5 Big-ip Local Traffic Manager=15.0.0
F5 Big-ip Fraud Protection Service>=11.5.2<=11.6.4
F5 Big-ip Fraud Protection Service>=12.1.0<=12.1.4
F5 Big-ip Fraud Protection Service>=13.1.0<=13.1.1
F5 Big-ip Fraud Protection Service>=14.0.0<=14.1.0
F5 Big-ip Fraud Protection Service=15.0.0
F5 Big-ip Global Traffic Manager>=11.5.2<=11.6.4
F5 Big-ip Global Traffic Manager>=12.1.0<=12.1.4
F5 Big-ip Global Traffic Manager>=13.1.0<=13.1.1
F5 Big-ip Global Traffic Manager>=14.0.0<=14.1.0
F5 Big-ip Global Traffic Manager=15.0.0
F5 BIG-IP Analytics>=11.5.2<=11.6.4
F5 BIG-IP Analytics>=12.1.0<=12.1.4
F5 BIG-IP Analytics>=13.1.0<=13.1.1
F5 BIG-IP Analytics>=14.0.0<=14.1.0
F5 BIG-IP Analytics=15.0.0
F5 BIG-IP Edge Gateway>=11.5.2<=11.6.4
F5 BIG-IP Edge Gateway>=12.1.0<=12.1.4
F5 BIG-IP Edge Gateway>=13.1.0<=13.1.1
F5 BIG-IP Edge Gateway>=14.0.0<=14.1.0
F5 BIG-IP Edge Gateway=15.0.0
F5 Big-ip Domain Name System>=11.5.2<=11.6.4
F5 Big-ip Domain Name System>=12.1.0<=12.1.4
F5 Big-ip Domain Name System>=13.1.0<=13.1.1
F5 Big-ip Domain Name System>=14.0.0<=14.1.0
F5 Big-ip Domain Name System=15.0.0
Canonical Ubuntu Linux=12.04
Canonical Ubuntu Linux=14.04
Canonical Ubuntu Linux=16.04
Canonical Ubuntu Linux=18.04
Canonical Ubuntu Linux=18.10
Canonical Ubuntu Linux=19.04
redhat Enterprise Linux Atomic Host
redhat Enterprise Linux=5.0
redhat Enterprise Linux=6.0
redhat Enterprise Linux=7.0
redhat Enterprise Linux=8.0
redhat Enterprise Linux Aus=6.5
redhat Enterprise Linux Aus=6.6
redhat Enterprise Linux Eus=7.4
redhat Enterprise Linux Eus=7.5
redhat Enterprise MRG=2.0
Ivanti Connect Secure
PulseSecure Pulse Policy Secure
PulseSecure Pulse Secure Virtual Application Delivery Controller
F5 Traffix Signaling Delivery Controller>=5.0.0<=5.1.0
PulseSecure Pulse Connect Secure
Siemens CloudConnect 712<1.1.5
1.1.5
Siemens ROX II<2.13.3
2.13.3
Siemens RUGGEDCOM APE 1404 Linux: All versions prior to Debian 9 Linux Image 2019-12-13
Siemens RUGGEDCOM RM1224 (6GK6108-4AM00)<6.2
6.2
Siemens RUGGEDCOM RX 1400 VPE Debian Linux: All versions prior to Debian 9 Linux Image 2019-12-13
Siemens RUGGEDCOM RX 1400 VPE Linux CloudConnect: All versions prior to Debian 9 Linux Image 2019-12-13 13 (only affected by CVE-2019-11479)
Siemens SCALANCE M804PB (6GK5804-0AP00-2AA2)<6.2
6.2
Siemens SCALANCE M812-1 ADSL-Router (Annex A) (6GK5812-1AA00-2AA2)<6.2
6.2
Siemens SCALANCE M812-1 ADSL-Router (Annex B) (6GK5812-1BA00-2AA2)<6.2
6.2
Siemens SCALANCE M816-1 ADSL-Router (Annex A) (6GK5816-1AA00-2AA2)<6.2
6.2
Siemens SCALANCE M816-1 ADSL-Router (Annex B) (6GK5816-1BA00-2AA2)<6.2
6.2
Siemens SCALANCE M826-2 SHDSL-Router (6GK5826-2AB00-2AB2)<6.2
6.2
Siemens SCALANCE M874-2 (6GK5874-2AA00-2AA2)<6.2
6.2
Siemens SCALANCE M874-3 (6GK5874-3AA00-2AA2)<6.2
6.2
Siemens SCALANCE M875
Siemens SCALANCE M876-3 (6GK5876-3AA02-2BA2)<6.2
6.2
Siemens SCALANCE M876-3 (ROK) (6GK5876-3AA02-2EA2)<6.2
6.2
Siemens SCALANCE M876-4 (EU) (6GK5876-4AA00-2BA2)<6.2
6.2
Siemens SCALANCE M876-4 (NAM) (6GK5876-4AA00-2DA2)<6.2
6.2
Siemens SCALANCE S602<4.1
4.1
Siemens SCALANCE S612<4.1
4.1
Siemens SCALANCE S615 (6GK5615-0AA00-2AA2)<6.2
6.2
Siemens SCALANCE S623<4.1
4.1
Siemens SCALANCE S627-2M<4.1
4.1
Siemens SCALANCE SC622-2C (6GK5622-2GS00-2AC2)<2.0.1
2.0.1
Siemens SCALANCE SC632-2C (6GK5632-2GS00-2AC2)<2.0.1
2.0.1
Siemens SCALANCE SC636-2C (6GK5636-2GS00-2AC2)<2.0.1
2.0.1
Siemens SCALANCE SC642-2C (6GK5642-2GS00-2AC2)<2.0.1
2.0.1
Siemens SCALANCE SC646-2C (6GK5646-2GS00-2AC2)<2.0.1
2.0.1
Siemens SCALANCE W1750D<8.6.0
8.6.0
Siemens SCALANCE W-700 IEEE 802.11n family<6.4
6.4
Siemens SCALANCE W-1700 IEEE 802.11ac family<2.0
2.0
Siemens SCALANCE WLC711
Siemens SCALANCE WLC712
Siemens SIMATIC CM 1542-1<3.0
3.0
Siemens SIMATIC CP 343-1 Advanced (incl. SIPLUS variants)
debian/linux
6.1.176-16.1.190-16.12.107-16.12.116-17.2.15-17.3.3-1

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 0:2.6.32-754.15.3.el6
  2. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 0:2.6.32-431.95.3.el6
  3. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 0:2.6.32-504.79.3.el6
  4. Upgrade

    Upgrade redhat/kernel-rt to a version that resolves this vulnerability.

    Fixed in 0:3.10.0-957.21.3.rt56.935.el7
  5. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 0:3.10.0-957.21.3.el7
  6. Upgrade

    Upgrade redhat/kernel-alt to a version that resolves this vulnerability.

    Fixed in 0:4.14.0-115.8.2.el7a
  7. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 0:3.10.0-327.79.2.el7
  8. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 0:3.10.0-514.66.2.el7
  9. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 0:3.10.0-693.50.3.el7
  10. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 0:3.10.0-862.34.2.el7
  11. Upgrade

    Upgrade redhat/kernel-rt to a version that resolves this vulnerability.

    Fixed in 0:4.18.0-80.4.2.rt9.152.el8_0
  12. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 0:4.18.0-80.4.2.el8_0
  13. Upgrade

    Upgrade redhat/kernel-rt to a version that resolves this vulnerability.

    Fixed in 1:3.10.0-693.50.3.rt56.644.el6
  14. Upgrade

    Upgrade redhat/redhat-release-virtualization-host to a version that resolves this vulnerability.

    Fixed in 0:4.2-11.1.el7
  15. Upgrade

    Upgrade redhat/redhat-virtualization-host to a version that resolves this vulnerability.

    Fixed in 0:4.2-20190618.0.el7_6
  16. Upgrade

    Upgrade redhat/redhat-release-virtualization-host to a version that resolves this vulnerability.

    Fixed in 0:4.3.4-1.el7e
  17. Upgrade

    Upgrade redhat/redhat-virtualization-host to a version that resolves this vulnerability.

    Fixed in 0:4.3.4-20190620.3.el7_6
  18. Upgrade

    Upgrade Siemens Simatic Cloud Connect 7 CC712 to a version that resolves this vulnerability.

    Fixed in 1.1.5
  19. Upgrade

    Upgrade Siemens ROX to a version that resolves this vulnerability.

    Fixed in 2.13.3
  20. Upgrade

    Upgrade Siemens RUGGEDCOM RM1224 to a version that resolves this vulnerability.

    Fixed in 6.2
  21. Upgrade

    Upgrade Siemens SCALANCE M804PB to a version that resolves this vulnerability.

    Fixed in 6.2
  22. Upgrade

    Upgrade Siemens Scalance M812-1 ADSL Router to a version that resolves this vulnerability.

    Fixed in 6.2
  23. Upgrade

    Upgrade Siemens Scalance M816-1 ADSL-Router Firmware to a version that resolves this vulnerability.

    Fixed in 6.2
  24. Upgrade

    Upgrade Siemens SCALANCE M826-2 SHDSL-Router to a version that resolves this vulnerability.

    Fixed in 6.2
  25. Upgrade

    Upgrade Siemens SCALANCE M874-2 to a version that resolves this vulnerability.

    Fixed in 6.2
  26. Upgrade

    Upgrade Siemens SCALANCE M874-3 to a version that resolves this vulnerability.

    Fixed in 6.2
  27. Upgrade

    Upgrade Siemens SCALANCE M876-3 to a version that resolves this vulnerability.

    Fixed in 6.2
  28. Upgrade

    Upgrade Siemens SCALANCE M876-4 to a version that resolves this vulnerability.

    Fixed in 6.2
  29. Upgrade

    Upgrade Siemens Scalance S602 Firmware to a version that resolves this vulnerability.

    Fixed in 4.1
  30. Upgrade

    Upgrade Siemens Scalance S612 Firmware to a version that resolves this vulnerability.

    Fixed in 4.1
  31. Upgrade

    Upgrade Siemens SCALANCE S615 to a version that resolves this vulnerability.

    Fixed in 6.2
  32. Upgrade

    Upgrade Siemens Scalance S623 Firmware to a version that resolves this vulnerability.

    Fixed in 4.1
  33. Upgrade

    Upgrade Siemens Scalance S627-2M Firmware to a version that resolves this vulnerability.

    Fixed in 4.1
  34. Upgrade

    Upgrade Siemens SCALANCE SC622-2C to a version that resolves this vulnerability.

    Fixed in 2.0.1
  35. Upgrade

    Upgrade Siemens SCALANCE SC632-2C to a version that resolves this vulnerability.

    Fixed in 2.0.1
  36. Upgrade

    Upgrade Siemens SCALANCE SC636-2C to a version that resolves this vulnerability.

    Fixed in 2.0.1
  37. Upgrade

    Upgrade Siemens SCALANCE SC642-2C to a version that resolves this vulnerability.

    Fixed in 2.0.1
  38. Upgrade

    Upgrade Siemens SCALANCE SC646-2C to a version that resolves this vulnerability.

    Fixed in 2.0.1
  39. Upgrade

    Upgrade Siemens Scalance W1750D Firmware to a version that resolves this vulnerability.

    Fixed in 8.6.0
  40. Upgrade

    Upgrade Siemens SCALANCE W-700 to a version that resolves this vulnerability.

    Fixed in 6.4
  41. Upgrade

    Upgrade Siemens SCALANCE W1700 IEEE 802.11ac to a version that resolves this vulnerability.

    Fixed in 2.0
  42. Upgrade

    Upgrade Siemens SIMATIC CM 1542-1 Firmware to a version that resolves this vulnerability.

    Fixed in 3.0
  43. Upgrade

    Upgrade debian/linux to a version that resolves this vulnerability.

    Fixed in 6.1.176-1Fixed in 6.1.190-1Fixed in 6.12.107-1Fixed in 6.12.116-1Fixed in 7.2.15-1Fixed in 7.3.3-1
  44. Upgrade

    Upgrade Linux kernel to a version that resolves this vulnerability.

    Patch f070ef2ac66716357066b683fb0baf55f8191a2e

Event History

Jun 11, 2019
Data Sourced
via Red Hat·06:36 AM
DescriptionSeverityAffected Software
Jun 17, 2019
CVE Published
05:00 PM
Jun 18, 2019
CVE Published
via MITRE·11:34 PM
Data Sourced
via MITRE·11:34 PM
DescriptionSeverityWeakness
Nov 3, 2026
Exploit Published
via GitHub·07:06 PM

Parent advisories

This vulnerability appears in the following advisories.

Peer vulnerabilities

Found alongside the following vulnerabilities.

Frequently Asked Questions

1

What is the severity of CVE-2019-11478?

CVE-2019-11478 is classified as a medium severity vulnerability that affects the Linux kernel's networking subsystem.

2

How do I fix CVE-2019-11478?

To fix CVE-2019-11478, upgrade to the latest patched version of the kernel as specified by your Linux distribution.

3

What versions of Linux are affected by CVE-2019-11478?

CVE-2019-11478 affects various versions of the Linux kernel, particularly those prior to the patches released in response.

4

What types of exploits could target CVE-2019-11478?

Exploits leveraging CVE-2019-11478 could lead to denial of service due to excessive resource consumption.

5

Is there a reference for CVE-2019-11478?

Yes, details about CVE-2019-11478 can be found in the official CVE records and security advisories from Red Hat.

Company

Resources

Contact

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