Ubuntu update for linux-aws

1) Path traversal

EUVDB-ID: #VU49914

Risk: Medium

CVSSv4.0: 6.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-28374

CWE-ID: CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Exploit availability: No

Description

The vulnerability allows a remote user to perform directory traversal attacks.

The vulnerability exists due to input validation error when processing directory traversal sequences in drivers/target/target_core_xcopy.c in the Linux kernel. A remote user with access to iSCSI LUN can send a specially crafted XCOPY request and read or write arbitrary files on the system.

Mitigation

Update the affected package linux-aws to the latest version.

Vulnerable software versions

Ubuntu: 18.04 - 20.10

linux-image-raspi (Ubuntu package): before 5.4.0.1028.63

linux-image-raspi2 (Ubuntu package): before 5.4.0.1028.63

linux-image-5.4.0-1039-azure (Ubuntu package): before 5.4.0-1039.41~18.04.1

linux-image-5.4.0-1037-oracle (Ubuntu package): before 5.4.0-1037.40~18.04.1

linux-image-5.4.0-1037-aws (Ubuntu package): before 5.4.0-1037.39~18.04.1

linux-image-5.4.0-1036-gcp (Ubuntu package): before 5.4.0-1036.39~18.04.1

linux-image-5.4.0-1032-kvm (Ubuntu package): before 5.4.0-1032.33

linux-image-5.4.0-1028-raspi (Ubuntu package): before 5.4.0-1028.31~18.04.1

linux-image-raspi-nolpae (Ubuntu package): before 5.8.0.1013.16

linux-image-oracle (Ubuntu package): before 5.4.0.1037.34

linux-image-kvm (Ubuntu package): before 5.4.0.1032.30

linux-image-gke (Ubuntu package): before 5.8.0.1020.20

linux-image-gcp (Ubuntu package): before 5.4.0.1036.23

linux-image-azure (Ubuntu package): before 5.4.0.1039.19

linux-image-aws (Ubuntu package): before 5.4.0.1037.21

linux-image-5.8.0-1021-aws (Ubuntu package): before 5.8.0-1021.23

linux-image-5.8.0-1020-gcp (Ubuntu package): before 5.8.0-1020.21

linux-image-5.8.0-1020-azure (Ubuntu package): before 5.8.0-1020.22

linux-image-5.8.0-1018-oracle (Ubuntu package): before 5.8.0-1018.19

linux-image-5.8.0-1016-kvm (Ubuntu package): before 5.8.0-1016.18

linux-image-5.8.0-1013-raspi-nolpae (Ubuntu package): before 5.8.0-1013.16

linux-image-5.8.0-1013-raspi (Ubuntu package): before 5.8.0-1013.16

linux-image-gke-5.4 (Ubuntu package): before 5.4.0.1035.37~18.04.3

linux-image-5.4.0-1035-gke (Ubuntu package): before 5.4.0-1035.37~18.04.1

linux-image-gkeop-5.4 (Ubuntu package): before 5.4.0.1009.10~18.04.10

linux-image-5.4.0-1009-gkeop (Ubuntu package): before 5.4.0-1009.10~18.04.1

linux-image-raspi-hwe-18.04 (Ubuntu package): before 5.4.0.1028.31

CPE2.3

• cpe:2.3:o:canonical:ubuntu:18.04:*:*:*:*:*:*:*
• cpe:2.3:o:canonical:ubuntu:20.04:*:*:*:*:*:*:*
• cpe:2.3:o:canonical:ubuntu:20.10:*:*:*:*:*:*:*
• cpe:2.3:a:canonical:linux-image-raspi_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-raspi2_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-5.4.0-1039-azure_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-5.4.0-1037-oracle_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-5.4.0-1037-aws_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-5.4.0-1036-gcp_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-5.4.0-1032-kvm_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-5.4.0-1028-raspi_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-raspi-nolpae_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-oracle_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-kvm_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-gke_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-gcp_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-azure_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-aws_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-5.8.0-1021-aws_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-5.8.0-1020-gcp_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-5.8.0-1020-azure_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-5.8.0-1018-oracle_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-5.8.0-1016-kvm_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-5.8.0-1013-raspi-nolpae_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-5.8.0-1013-raspi_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-gke-5.4_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-5.4.0-1035-gke_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-gkeop-5.4_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-5.4.0-1009-gkeop_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-raspi-hwe-18.04_ubuntu_package:*:*:*:*:*:ubuntu:*:*

External links

https://ubuntu.com/security/notices/USN-4713-1

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.