Virtuozzo 7 : readykernel-patch (VZA-2020-013)

Medium Nessus Plugin ID 133765

Synopsis

The remote Virtuozzo host is missing a security update.

Description

According to the version of the vzkernel package and the readykernel-patch installed, the Virtuozzo installation on the remote host is affected by the following vulnerabilities :

- [3.10.0-862.9.1.vz7.63.3 to 3.10.0-862.20.2.vz7.73.29] Use-after-free in fs/xfs/xfs_super.c. A flaw was found in the implementation of XFS filesystem where a key data structure (sb->s_fs_info) may not be de-allocated properly when the system is under memory pressure. This could allow a local attacker to create a use-after-free situation which can result in memory corruption or, potentially, privilege escalation.

- [3.10.0-862.9.1.vz7.63.3 to 3.10.0-1062.4.2.vz7.116.7] Kernel crash due to out-of-bounds memory accesses in process_vm_readv(). It was discovered that the implementation of process_vm_readv() system call could try to access memory outside of the structures it was processing in certain cases. A local unprivileged user could use this vulnerability to crash the system.

Note that Tenable Network Security has extracted the preceding description block directly from the Virtuozzo security advisory.
Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Solution

Update the readykernel patch.

See Also

https://virtuozzosupport.force.com/s/article/VZA-2020-013

https://access.redhat.com/security/cve/cve-2018-20976

http://www.nessus.org/u?681caf3b

http://www.nessus.org/u?74b2cef1

http://www.nessus.org/u?e30387f0

http://www.nessus.org/u?6a9b59dd

http://www.nessus.org/u?4d14d795

http://www.nessus.org/u?65cc2737

http://www.nessus.org/u?126c50e1

http://www.nessus.org/u?8a79237c

Plugin Details

Severity: Medium

ID: 133765

File Name: Virtuozzo_VZA-2020-013.nasl

Version: 1.3

Type: local

Published: 2020/02/18

Updated: 2020/03/04

Dependencies: 12634

Risk Information

Risk Factor: Medium

CVSS v2.0

Base Score: 4.6

Temporal Score: 3.4

Vector: CVSS2#AV:L/AC:L/Au:N/C:P/I:P/A:P

Temporal Vector: CVSS2#E:U/RL:OF/RC:C

CVSS v3.0

Base Score: 7.8

Temporal Score: 6.8

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:virtuozzo:virtuozzo:readykernel, cpe:/o:virtuozzo:virtuozzo:7

Required KB Items: Host/local_checks_enabled, Host/Virtuozzo/release, Host/Virtuozzo/rpm-list, Host/readykernel-info

Exploit Ease: No known exploits are available

Patch Publication Date: 2020/02/10

Reference Information

CVE: CVE-2018-20976