Ubuntu update for linux

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 to the latest version.

Vulnerable software versions

Ubuntu: 14.04 - 20.10

linux-image-virtual-lts-xenial (Ubuntu package): before 4.4.0.200.175

linux-image-powerpc64-smp-lts-xenial (Ubuntu package): before 4.4.0.200.175

linux-image-powerpc64-emb-lts-xenial (Ubuntu package): before 4.4.0.200.175

linux-image-powerpc-smp-lts-xenial (Ubuntu package): before 4.4.0.200.175

linux-image-powerpc-e500mc-lts-xenial (Ubuntu package): before 4.4.0.200.175

linux-image-lowlatency-lts-xenial (Ubuntu package): before 4.4.0.200.175

linux-image-generic-lts-xenial (Ubuntu package): before 4.4.0.200.175

linux-image-generic-lpae-lts-xenial (Ubuntu package): before 4.4.0.200.175

linux-image-4.4.0-200-powerpc64-smp (Ubuntu package): before 4.4.0-200.232~14.04.1

linux-image-4.4.0-200-powerpc64-emb (Ubuntu package): before 4.4.0-200.232~14.04.1

linux-image-4.4.0-200-powerpc-smp (Ubuntu package): before 4.4.0-200.232~14.04.1

linux-image-4.4.0-200-powerpc-e500mc (Ubuntu package): before 4.4.0-200.232~14.04.1

linux-image-4.4.0-200-lowlatency (Ubuntu package): before 4.4.0-200.232~14.04.1

linux-image-4.4.0-200-generic-lpae (Ubuntu package): before 4.4.0-200.232~14.04.1

linux-image-4.4.0-200-generic (Ubuntu package): before 4.4.0-200.232~14.04.1

linux-image-virtual-hwe-20.04 (Ubuntu package): before 5.8.0.38.43~20.04.23

linux-image-oem-osp1 (Ubuntu package): before 5.4.0.62.65

linux-image-oem (Ubuntu package): before 4.15.0.132.130

linux-image-lowlatency-hwe-20.04 (Ubuntu package): before 5.8.0.38.43~20.04.23

linux-image-generic-lpae-hwe-20.04 (Ubuntu package): before 5.8.0.38.43~20.04.23

linux-image-generic-hwe-20.04 (Ubuntu package): before 5.8.0.38.43~20.04.23

linux-image-5.4.0-62-lowlatency (Ubuntu package): before 5.4.0-62.70~18.04.1

linux-image-5.4.0-62-generic-lpae (Ubuntu package): before 5.4.0-62.70~18.04.1

linux-image-5.4.0-62-generic (Ubuntu package): before 5.4.0-62.70~18.04.1

linux-image-virtual (Ubuntu package): before 4.4.0.200.206

linux-image-lowlatency (Ubuntu package): before 4.4.0.200.206

linux-image-generic-lpae (Ubuntu package): before 4.4.0.200.206

linux-image-generic-64k (Ubuntu package): before 5.8.0.38.42

linux-image-generic (Ubuntu package): before 4.4.0.200.206

linux-image-5.8.0-38-lowlatency (Ubuntu package): before 5.8.0-38.43~20.04.1

linux-image-5.8.0-38-generic-lpae (Ubuntu package): before 5.8.0-38.43~20.04.1

linux-image-5.8.0-38-generic-64k (Ubuntu package): before 5.8.0-38.43

linux-image-5.8.0-38-generic (Ubuntu package): before 5.8.0-38.43~20.04.1

linux-image-powerpc64-smp (Ubuntu package): before 4.4.0.200.206

linux-image-powerpc64-emb (Ubuntu package): before 4.4.0.200.206

linux-image-powerpc-smp (Ubuntu package): before 4.4.0.200.206

linux-image-powerpc-e500mc (Ubuntu package): before 4.4.0.200.206

linux-image-virtual-hwe-18.04 (Ubuntu package): before 5.4.0.62.70~18.04.57

linux-image-snapdragon-hwe-18.04 (Ubuntu package): before 5.4.0.62.70~18.04.57

linux-image-lowlatency-hwe-18.04 (Ubuntu package): before 5.4.0.62.70~18.04.57

linux-image-generic-lpae-hwe-18.04 (Ubuntu package): before 5.4.0.62.70~18.04.57

linux-image-generic-hwe-18.04 (Ubuntu package): before 5.4.0.62.70~18.04.57

linux-image-4.15.0-132-lowlatency (Ubuntu package): before 4.15.0-132.136~16.04.1

linux-image-4.15.0-132-generic-lpae (Ubuntu package): before 4.15.0-132.136~16.04.1

linux-image-4.15.0-132-generic (Ubuntu package): before 4.15.0-132.136~16.04.1

linux-image-virtual-hwe-16.04 (Ubuntu package): before 4.15.0.132.130

linux-image-lowlatency-hwe-16.04 (Ubuntu package): before 4.15.0.132.130

linux-image-generic-lpae-hwe-16.04 (Ubuntu package): before 4.15.0.132.130

linux-image-generic-hwe-16.04 (Ubuntu package): before 4.15.0.132.130

CPE2.3

• cpe:2.3:o:canonical:ubuntu:14.04:*:*:*:*:*:*:*
• cpe:2.3:o:canonical:ubuntu:16.04:*:*:*:*:*:*:*
• 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-virtual-lts-xenial_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-powerpc64-smp-lts-xenial_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-powerpc64-emb-lts-xenial_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-powerpc-smp-lts-xenial_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-powerpc-e500mc-lts-xenial_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-lowlatency-lts-xenial_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-generic-lts-xenial_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-generic-lpae-lts-xenial_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-4.4.0-200-powerpc64-smp_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-4.4.0-200-powerpc64-emb_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-4.4.0-200-powerpc-smp_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-4.4.0-200-powerpc-e500mc_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-4.4.0-200-lowlatency_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-4.4.0-200-generic-lpae_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-4.4.0-200-generic_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-virtual-hwe-20.04:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-oem-osp1_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-oem_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-lowlatency-hwe-20.04:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-generic-lpae-hwe-20.04_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-generic-hwe-20.04:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-5.4.0-62-lowlatency_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-5.4.0-62-generic-lpae_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-5.4.0-62-generic_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-virtual_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-lowlatency_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-generic-lpae_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-generic-64k_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-generic_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-5.8.0-38-lowlatency_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-5.8.0-38-generic-lpae_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-5.8.0-38-generic-64k_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-5.8.0-38-generic_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-powerpc64-smp_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-powerpc64-emb_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-powerpc-smp_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-powerpc-e500mc_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-virtual-hwe-18.04_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-snapdragon-hwe-18.04_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-lowlatency-hwe-18.04_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-generic-lpae-hwe-18.04_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-generic-hwe-18.04_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-4.15.0-132-lowlatency_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-4.15.0-132-generic-lpae_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-4.15.0-132-generic_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-virtual-hwe-16.04_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-lowlatency-hwe-16.04_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-generic-lpae-hwe-16.04_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-generic-hwe-16.04_ubuntu_package:*:*:*:*:*:ubuntu:*:*

External links

https://ubuntu.com/security/notices/USN-4694-1

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.