PT-2020-4974 · Linux+2 · Linux Kernel+2

Published 2020-02-08 · Updated 2021-05-28 · CVE-2020-29373

Positive Technologies (AI Summary)

CVSS v2.0

8.5

High

Base vector

AV:N/AC:L/Au:N/C:P/I:C/A:N

Name of the Vulnerable Software and Affected Versions Linux kernel versions prior to 5.6

Description An issue was discovered in fs/io uring.c. It unsafely handles the root directory during path lookups, allowing a process inside a mount namespace to escape to unintended filesystem locations. This could potentially impact the integrity and confidentiality of data.

Recommendations For Linux kernel versions prior to 5.6, update to version 5.6 or later to resolve the issue. As a temporary workaround, consider restricting access to the fs/io uring.c component to minimize the risk of exploitation.

Exploit

Fix

Path traversal

Weakness Enumeration

CWE-22

Related Identifiers

ALT-PU-2020-1638

ALT-PU-2020-1646

ALT-PU-2020-1761

ALT-PU-2020-1917

ALT-PU-2020-2153

ALT-PU-2020-2164

ALT-PU-2021-1621

ALT-PU-2021-1656

ALT-PU-2021-1739

ALT-PU-2021-1862

ALT-PU-2021-1866

ALT-PU-2021-1870

BDU:2020-05551

CVE-2020-29373

OPENSUSE-SU-2021:0060-1

OPENSUSE-SU-2021:0242-1

OPENSUSE-SU-2021_0060-1

OPENSUSE-SU-2021_0242-1

SUSE-SU-2021:0096-1

SUSE-SU-2021:0108-1

SUSE-SU-2021:0117-1

SUSE-SU-2021:0359-1

SUSE-SU-2021:0362-1

SUSE-SU-2021:0367-1

SUSE-SU-2021:0869-1

Affected Products

Alt Linux

Linux Kernel

Suse

References · 887

• 🔥 https://bugs.chromium.org/p/project-zero/issues/detail?id=2011 · Exploit
• https://osv.dev/vulnerability/SUSE-SU-2021:0108-1 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2020-29373 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2021:0096-1 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2021:0060-1 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2020-29373 · Security Note
• https://bdu.fstec.ru/vul/2020-05551 · Security Note
• https://osv.dev/vulnerability/openSUSE-SU-2021:0242-1 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2020-29373 · Vendor Advisory
• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ff002b30181d30cdfbca316dadd099c3ca0d739c · Vendor Advisory
• https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.6 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2021:0359-1 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2021:0362-1 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2021:0869-1 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2020-29373 · Vendor Advisory