UBUNTU-CVE-2023-52441: Medium severity ubuntu/linux-hwe-edge vulnerability

Q: Which systems are exposed to this issue?

Systems using the listed Ubuntu Linux kernel packages may be exposed if the ksmbd SMB server is reachable by clients. The affected package set includes linux-azure, linux-gcp, linux-azure-fde, linux-gke, linux-riscv, linux-realtime, and the listed AWS and Azure FIPS variants.

Q: What does an attacker need to send to trigger the vulnerable path?

An attacker needs to send an SMB2 negotiate request followed by an SMB1 negotiate request. The issue occurs after the initial SMB2 negotiation causes need_neg to be set to false, allowing an SMB1 packet to reach init_smb2_rsp_hdr().

Q: What mitigation is available if the kernel update cannot be applied immediately?

Limit access to the ksmbd SMB service so untrusted clients cannot send SMB negotiation requests. The fix changes ksmbd behavior to ignore SMB1 packets after need_neg has been set to false.

Published Feb 21, 2024

Updated

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix out of bounds in initsmb2rsphdr() If client send smb2 negotiate request and then send smb1 negotiate request, initsmb2rsphdr is called for smb1 negotiate request since needneg is set to false. This patch ignore smb1 packets after ->needneg is set to false.

Affected Software

104 affected componentsFixes available

ubuntu/linux-hwe-edge*

ubuntu/linux-aws-5.0*

ubuntu/linux-aws-5.3*

ubuntu/linux-azure*

ubuntu/linux-azure-5.3*

ubuntu/linux-azure-edge*

ubuntu/linux-gcp*

ubuntu/linux-gcp-5.3*

ubuntu/linux-gke-4.15*

ubuntu/linux-gke-5.4*

ubuntu/linux-gkeop-5.4*

ubuntu/linux-hwe*

ubuntu/linux-oem*

ubuntu/linux-oracle-5.0*

ubuntu/linux-oracle-5.3*

ubuntu/linux-aws-5.15<5.15.0-1057.63~20.04.1

5.15.0-1057.63~20.04.1

ubuntu/linux-azure-5.15<5.15.0-1060.69~20.04.1

5.15.0-1060.69~20.04.1

ubuntu/linux-gcp-5.15<5.15.0-1055.63~20.04.1

5.15.0-1055.63~20.04.1

ubuntu/linux-gkeop-5.15<5.15.0-1040.46~20.04.1

5.15.0-1040.46~20.04.1

ubuntu/linux-hwe-5.15<5.15.0-102.112~20.04.1

5.15.0-102.112~20.04.1

ubuntu/linux-ibm-5.15<5.15.0-1050.53~20.04.1

5.15.0-1050.53~20.04.1

ubuntu/linux-intel-iotg-5.15<5.15.0-1052.58~20.04.1

5.15.0-1052.58~20.04.1

ubuntu/linux-lowlatency-hwe-5.15<5.15.0-102.112~20.04.1

5.15.0-102.112~20.04.1

ubuntu/linux-nvidia-tegra-5.15<5.15.0-1025.25~20.04.1

5.15.0-1025.25~20.04.1

ubuntu/linux-oracle-5.15<5.15.0-1055.61~20.04.1

5.15.0-1055.61~20.04.1

ubuntu/linux-riscv-5.15<5.15.0-1053.57~20.04.1

5.15.0-1053.57~20.04.1

ubuntu/linux-aws-5.11*

ubuntu/linux-aws-5.13*

ubuntu/linux-aws-5.8*

ubuntu/linux-azure-5.11*

ubuntu/linux-azure-5.13*

ubuntu/linux-azure-5.8*

ubuntu/linux-azure-fde*

ubuntu/linux-gcp-5.11*

ubuntu/linux-gcp-5.13*

ubuntu/linux-gcp-5.8*

ubuntu/linux-gke*

ubuntu/linux-gke-5.15*

ubuntu/linux-hwe-5.11*

ubuntu/linux-hwe-5.13*

ubuntu/linux-hwe-5.8*

ubuntu/linux-intel-5.13*

ubuntu/linux-oem-5.10*

ubuntu/linux-oem-5.13*

ubuntu/linux-oem-5.6*

ubuntu/linux-oracle-5.11*

ubuntu/linux-oracle-5.13*

ubuntu/linux-oracle-5.8*

ubuntu/linux-raspi2*

ubuntu/linux-riscv*

ubuntu/linux-riscv-5.11*

ubuntu/linux-riscv-5.8*

ubuntu/linux<5.15.0-102.112

5.15.0-102.112

ubuntu/linux-allwinner-5.19*

ubuntu/linux-aws<5.15.0-1057.63

5.15.0-1057.63

ubuntu/linux-aws-5.19*

ubuntu/linux-aws-6.2*

ubuntu/linux-azure<5.15.0-1060.69

5.15.0-1060.69

ubuntu/linux-azure-5.19*

ubuntu/linux-azure-6.2*

ubuntu/linux-azure-fde<5.15.0-1060.69.1

5.15.0-1060.69.1

ubuntu/linux-azure-fde-5.19*

ubuntu/linux-azure-fde-6.2*

ubuntu/linux-gcp<5.15.0-1055.63

5.15.0-1055.63

ubuntu/linux-gcp-5.19*

ubuntu/linux-gcp-6.2*

ubuntu/linux-gke<5.15.0-1054.59

5.15.0-1054.59

ubuntu/linux-gkeop<5.15.0-1040.46

5.15.0-1040.46

ubuntu/linux-hwe-5.19*

ubuntu/linux-hwe-6.2*

ubuntu/linux-ibm<5.15.0-1050.53

5.15.0-1050.53

ubuntu/linux-intel-iotg<5.15.0-1052.58

5.15.0-1052.58

ubuntu/linux-kvm<5.15.0-1054.59

5.15.0-1054.59

ubuntu/linux-lowlatency<5.15.0-102.112

5.15.0-102.112

ubuntu/linux-lowlatency-hwe-5.19*

ubuntu/linux-lowlatency-hwe-6.2*

ubuntu/linux-nvidia<5.15.0-1048.48

5.15.0-1048.48

ubuntu/linux-nvidia-6.2*

ubuntu/linux-nvidia-tegra<5.15.0-1025.25

5.15.0-1025.25

ubuntu/linux-nvidia-tegra-igx<5.15.0-1012.12

5.15.0-1012.12

ubuntu/linux-oem-5.17*

ubuntu/linux-oem-6.0*

ubuntu/linux-oem-6.1*

ubuntu/linux-oracle<5.15.0-1055.61

5.15.0-1055.61

ubuntu/linux-raspi<5.15.0-1050.53

5.15.0-1050.53

ubuntu/linux-realtime*

ubuntu/linux-riscv*

ubuntu/linux-riscv-5.19*

ubuntu/linux-starfive-5.19*

ubuntu/linux-starfive-6.2*

ubuntu/linux-xilinx-zynqmp<5.15.0-1030.34

5.15.0-1030.34

ubuntu/linux-bluefield<5.15.0-1040.42

5.15.0-1040.42

ubuntu/linux-intel-iot-realtime<5.15.0-1050.52

5.15.0-1050.52

ubuntu/linux-realtime<5.15.0-1058.66

5.15.0-1058.66

ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

ubuntu/linux-fips*

ubuntu/linux-gcp-fips*

ubuntu/linux-aws-fips<5.15.0-1057.63+fips1

5.15.0-1057.63+fips1

ubuntu/linux-azure-fips<5.15.0-1060.69+fips1

5.15.0-1060.69+fips1

ubuntu/linux-fips<5.15.0-102.112+fips1

5.15.0-102.112+fips1

ubuntu/linux-gcp-fips<5.15.0-1055.63+fips2

5.15.0-1055.63+fips2

ubuntu/linux-raspi-realtime*

ubuntu/linux-vmware*

Remediation

Recommended actions to resolve this vulnerability, in priority order.

Upgrade
Upgrade ubuntu/linux-aws-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1057.63~20.04.1
Upgrade
Upgrade ubuntu/linux-azure-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1060.69~20.04.1
Upgrade
Upgrade ubuntu/linux-gcp-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1055.63~20.04.1
Upgrade
Upgrade ubuntu/linux-gkeop-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1040.46~20.04.1
Upgrade
Upgrade ubuntu/linux-hwe-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-102.112~20.04.1
Upgrade
Upgrade ubuntu/linux-ibm-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1050.53~20.04.1
Upgrade
Upgrade ubuntu/linux-intel-iotg-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1052.58~20.04.1
Upgrade
Upgrade ubuntu/linux-lowlatency-hwe-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-102.112~20.04.1
Upgrade
Upgrade ubuntu/linux-nvidia-tegra-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1025.25~20.04.1
Upgrade
Upgrade ubuntu/linux-oracle-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1055.61~20.04.1
Upgrade
Upgrade ubuntu/linux-riscv-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1053.57~20.04.1
Upgrade
Upgrade ubuntu/linux to a version that resolves this vulnerability.
Fixed in 5.15.0-102.112
Upgrade
Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.
Fixed in 5.15.0-1057.63
Upgrade
Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.
Fixed in 5.15.0-1060.69
Upgrade
Upgrade ubuntu/linux-azure-fde to a version that resolves this vulnerability.
Fixed in 5.15.0-1060.69.1
Upgrade
Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.
Fixed in 5.15.0-1055.63
Upgrade
Upgrade ubuntu/linux-gke to a version that resolves this vulnerability.
Fixed in 5.15.0-1054.59
Upgrade
Upgrade ubuntu/linux-gkeop to a version that resolves this vulnerability.
Fixed in 5.15.0-1040.46
Upgrade
Upgrade ubuntu/linux-ibm to a version that resolves this vulnerability.
Fixed in 5.15.0-1050.53
Upgrade
Upgrade ubuntu/linux-intel-iotg to a version that resolves this vulnerability.
Fixed in 5.15.0-1052.58
Upgrade
Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.
Fixed in 5.15.0-1054.59
Upgrade
Upgrade ubuntu/linux-lowlatency to a version that resolves this vulnerability.
Fixed in 5.15.0-102.112
Upgrade
Upgrade ubuntu/linux-nvidia to a version that resolves this vulnerability.
Fixed in 5.15.0-1048.48
Upgrade
Upgrade ubuntu/linux-nvidia-tegra to a version that resolves this vulnerability.
Fixed in 5.15.0-1025.25
Upgrade
Upgrade ubuntu/linux-nvidia-tegra-igx to a version that resolves this vulnerability.
Fixed in 5.15.0-1012.12
Upgrade
Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.
Fixed in 5.15.0-1055.61
Upgrade
Upgrade ubuntu/linux-raspi to a version that resolves this vulnerability.
Fixed in 5.15.0-1050.53
Upgrade
Upgrade ubuntu/linux-xilinx-zynqmp to a version that resolves this vulnerability.
Fixed in 5.15.0-1030.34
Upgrade
Upgrade ubuntu/linux-bluefield to a version that resolves this vulnerability.
Fixed in 5.15.0-1040.42
Upgrade
Upgrade ubuntu/linux-intel-iot-realtime to a version that resolves this vulnerability.
Fixed in 5.15.0-1050.52
Upgrade
Upgrade ubuntu/linux-realtime to a version that resolves this vulnerability.
Fixed in 5.15.0-1058.66
Upgrade
Upgrade ubuntu/linux-aws-fips to a version that resolves this vulnerability.
Fixed in 5.15.0-1057.63+fips1
Upgrade
Upgrade ubuntu/linux-azure-fips to a version that resolves this vulnerability.
Fixed in 5.15.0-1060.69+fips1
Upgrade
Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.
Fixed in 5.15.0-102.112+fips1
Upgrade
Upgrade ubuntu/linux-gcp-fips to a version that resolves this vulnerability.
Fixed in 5.15.0-1055.63+fips2
Compensating control
Ignore SMB1 packets after the SMB2 negotiation has set need_neg to false, preventing init_smb2_rsp_hdr() from processing subsequent SMB1 negotiate requests.

Event History

Feb 21, 2024

CVE Published

via OSV·08:15 AM

Data Sourced

via OSV·08:15 AM

DescriptionSeverityAffected Software

Frequently Asked Questions

Which systems are exposed to this issue?

Systems using the listed Ubuntu Linux kernel packages may be exposed if the ksmbd SMB server is reachable by clients. The affected package set includes linux-azure, linux-gcp, linux-azure-fde, linux-gke, linux-riscv, linux-realtime, and the listed AWS and Azure FIPS variants.

What does an attacker need to send to trigger the vulnerable path?

An attacker needs to send an SMB2 negotiate request followed by an SMB1 negotiate request. The issue occurs after the initial SMB2 negotiation causes need_neg to be set to false, allowing an SMB1 packet to reach init_smb2_rsp_hdr().

What mitigation is available if the kernel update cannot be applied immediately?

Limit access to the ksmbd SMB service so untrusted clients cannot send SMB negotiation requests. The fix changes ksmbd behavior to ignore SMB1 packets after need_neg has been set to false.

UBUNTU-CVE-2023-52441: Medium severity ubuntu/linux-hwe-edge vulnerability

Affected Software

Remediation

Event History

Frequently Asked Questions

Which systems are exposed to this issue?

What does an attacker need to send to trigger the vulnerable path?

What mitigation is available if the kernel update cannot be applied immediately?

Company

Resources

Contact

Frequently Asked Questions

Which systems are exposed to this issue?

What does an attacker need to send to trigger the vulnerable path?

What mitigation is available if the kernel update cannot be applied immediately?