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ibmIBM09C3CD9A603BBCA07E7C38D8E8F2C12C8D70F4E6D1C69AEFC2384E5E0868F9D7
HistoryNov 05, 2019 - 10:28 p.m.

Security Bulletin: IBM RackSwitch firmware products are affected by TCP denial of service vulnarabilities

2019-11-0522:28:10
www.ibm.com
28

0.974 High

EPSS

Percentile

99.9%

Summary

The IBM RackSwitch firmware products listed below have addressed the following TCP denial of service vulnerabilities.

Vulnerability Details

CVEID:CVE-2019-11478
**DESCRIPTION:**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.
CVSS Base score: 7.5
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/162664 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)

CVEID:CVE-2019-11477
**DESCRIPTION:**Jonathan Looney discovered that the TCP_SKB_CB(skb)->tcp_gso_segs value was subject to an integer overflow in the Linux kernel when handling TCP Selective Acknowledgments (SACKs). 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 3b4929f65b0d8249f19a50245cd88ed1a2f78cff.
CVSS Base score: 7.5
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/162662 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)

CVEID:CVE-2019-11479
**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.
CVSS Base score: 7.5
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/162665 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)

Affected Products and Versions

Product

|

Version

—|—

IBM RackSwitch G8052

|

7.11

IBM RackSwitch G8124/G8124E

|

7.11

IBM RackSwitch G8264

|

7.11

IBM RackSwitch G8264CS

|

7.8

IBM RackSwitch G8264T

|

7.9

IBM RackSwitch G8316

|

7.9

IBM RackSwitch G8332

|

7.7

Remediation/Fixes

Firmware fix versions are available on Fix Central: http://www.ibm.com/support/fixcentral/

Product

|

Fix Version

—|—

IBM RackSwitch G8052
(G8052_Image_7.11.16.0)

|

7.11.16.0

IBM RackSwitch G8124/G8124E
(G8124_G8124E_Image_7.11.16.0)

|

7.11.16.0

IBM RackSwitch G8264
(G8264_Image_7.11.16.0)

|

7.11.16.0

IBM RackSwitch G8264CS
(G8264CS_Image_7.8.24.0)

|

7.8.24.0

IBM RackSwitch G8264T
(G8264T_Image_7.9.26.0)

|

7.9.26.0

IBM RackSwitch G8316
(G8316_Image_7.9.26.0)

|

7.9.26.0

IBM RackSwitch G8332
(G8332_Image_7.7.32.0)

|

7.7.32.0

Workarounds and Mitigations

None