PT-2021-4224 · Linux+9 · Linux Kernel+9

Syzbot · Published 2021-03-04 · Updated 2023-05-17 · CVE-2021-33033

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Linux kernel versions prior to 5.11.14

Description The issue is related to a use-after-free error in the cipso v4 genopt function, located in net/ipv4/cipso ipv4.c, due to mishandled CIPSO and CALIPSO refcounting for the DOI definitions. This can lead to writing an arbitrary value, potentially allowing an attacker to execute arbitrary code.

Recommendations For versions prior to 5.11.14, update to version 5.11.14 or later to resolve the issue. As a temporary workaround, consider restricting access to the cipso v4 genopt function until a patch is available.

Exploit

Fix

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

ALSA-2021:4356

ALT-PU-2021-1666

ALT-PU-2021-1698

ALT-PU-2021-1869

ALT-PU-2021-1888

ALT-PU-2021-1896

ALT-PU-2022-1240

ALT-PU-2022-1419

ALT-PU-2022-1421

ALT-PU-2023-1814

AZL-6561

BDU:2021-04828

CESA-2021_2725

CESA-2021_4140

CESA-2021_4356

CVE-2021-33033

DLA-2940-1

OESA-2021-1176

OPENSUSE-SU-2021:1477-1

OPENSUSE-SU-2021:3641-1

OPENSUSE-SU-2021:3675-1

OPENSUSE-SU-2021:3876-1

OPENSUSE-SU-2021_1460-1

OPENSUSE-SU-2021_1477-1

OPENSUSE-SU-2021_3641-1

OPENSUSE-SU-2021_3655-1

OPENSUSE-SU-2021_3675-1

OPENSUSE-SU-2021_3876-1

RHSA-2021:2725

RHSA-2021:2726

RHSA-2021:4140

RHSA-2021:4356

RHSA-2021_2725

RHSA-2021_2726

RHSA-2021_4140

RHSA-2021_4356

SUSE-SU-2021:14849-1

SUSE-SU-2021:3641-1

SUSE-SU-2021:3642-1

SUSE-SU-2021:3675-1

SUSE-SU-2021:3723-1

SUSE-SU-2021:3748-1

SUSE-SU-2021:3876-1

SUSE-SU-2021:3929-1

SUSE-SU-2021:3935-1

SUSE-SU-2021:3969-1

SUSE-SU-2021_14849-1

USN-4979-1

USN-4984-1

USN-5343-1

Affected Products

Alt Linux

Almalinux

Astra Linux

Centos

Linuxmint

Linux Kernel

Red Hat

Red Os

Suse

Ubuntu

References · 432

• 🔥 https://syzkaller.appspot.com/bug?id=96e7d345748d8814901c91cd92084ed04b46701e · Exploit
• 🔥 https://sites.google.com/view/syzscope/kasan-use-after-free-read-in-cipso_v4_genopt · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2021-31829 · Security Note
• https://ubuntu.com/security/CVE-2021-38208 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2021-33033 · Security Note
• https://linux.oracle.com/errata/ELSA-2021-9362.html · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-29154 · Security Note
• https://ubuntu.com/security/CVE-2021-42008 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-38160 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-29650 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2021:14849-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-28952 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-43389 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2021:1477-1 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-30002 · Security Note