Red Hat Enterprise Linux 8.4 update for kpatch-patch

1) Buffer overflow

EUVDB-ID: #VU58209

Risk: Medium

CVSSv3.1: 7.9 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2021-43267

CWE-ID: CWE-119 - Memory corruption

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to compromise the affected system.

The vulnerability exists due to insufficient validation of user-supplied input in net/tipc/crypto.c in the Linux kernel. The Transparent Inter-Process Communication (TIPC) functionality allows remote attackers to exploit insufficient validation of user-supplied sizes for the MSG_CRYPTO message type.

A remote attacker can send specially crafted MSG_CRYPTO messages to the affected system, trigger memory corruption and execute arbitrary code on the system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

kpatch-patch-4_18_0-305_7_1 (Red Hat package): 1-1.el8_4 - 1-4.el8_4

kpatch-patch-4_18_0-305_3_1 (Red Hat package): 1-1.el8_4 - 1-5.el8_4

kpatch-patch-4_18_0-305_19_1 (Red Hat package): 1-1.el8_4

kpatch-patch-4_18_0-305_17_1 (Red Hat package): 1-1.el8_4

kpatch-patch-4_18_0-305_12_1 (Red Hat package): 1-2.el8_4

kpatch-patch-4_18_0-305_10_2 (Red Hat package): 1-3.el8_4

kpatch-patch-4_18_0-305 (Red Hat package): 1-2.el8 - 1-6.el8

Red Hat Enterprise Linux Server for x86_64 - Update Services for SAP Solutions: 8.4

Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions: 8.4

Red Hat Enterprise Linux Server - TUS: 8.4

Red Hat Enterprise Linux for Power, little endian - Extended Update Support: 8.4

Red Hat Enterprise Linux Server - AUS: 8.4

Red Hat Enterprise Linux for x86_64 - Extended Update Support: 8.4

kpatch-patch-4_18_0-305_25_1 (Red Hat package): before 1-2.el8_4

External links

http://access.redhat.com/errata/RHSA-2021:4644

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.