Virtuozzo 6 : parallels-server-bm-release / vzkernel / etc (VZA-2016-104)

high Nessus Plugin ID 121162

Synopsis

The remote Virtuozzo host is missing multiple security updates.

Description

According to the versions of the parallels-server-bm-release / vzkernel / etc packages installed, the Virtuozzo installation on the remote host is affected by the following vulnerabilities :

- Stack overflow via ecryptfs and /proc/$pid/environ. It was found that stacking a file system over procfs in the Linux kernel could lead to a kernel stack overflow due to deep nesting, as demonstrated by mounting ecryptfs over procfs and creating a recursion by mapping /proc/environ. An unprivileged, local user could potentially use this flaw to escalate their privileges on the system.

- Use after free in tcp_xmit_retransmit_queue. A use after free vulnerability was found in tcp_xmit_retransmit_queue and other tcp_* functions.
This condition could allow an attacker to send an incorrect selective acknowledgment to existing connections, possibly resetting a connection.

- block: fix use-after-free in seq file. Use-after-free vulnerability in the disk_seqf_stop function in block/genhd.c in the Linux kernel before 4.7.1 allows local users to gain privileges by leveraging the execution of a certain stop operation even if the corresponding start operation had failed.

- block: fix use-after-free in sys_ioprio_get(). Race condition in the get_task_ioprio function in block/ioprio.c in the Linux kernel before 4.6.6 allows local users to gain privileges or cause a denial of service (use-after-free) via a crafted ioprio_get system call.

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 affected parallels-server-bm-release / vzkernel / etc packages.

Plugin Details

Severity: High

ID: 121162

File Name: Virtuozzo_VZA-2016-104.nasl

Version: 1.4

Type: local

Family: Virtuozzo Local Security Checks

Published: 1/14/2019

Updated: 6/26/2024

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: High

Base Score: 9.3

Temporal Score: 7.3

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

CVSS Score Source: CVE-2016-7911

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 7

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

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

Vulnerability Information

CPE: p-cpe:/a:virtuozzo:virtuozzo:vzmodules, p-cpe:/a:virtuozzo:virtuozzo:vzkernel-devel, p-cpe:/a:virtuozzo:virtuozzo:vzmodules-devel, p-cpe:/a:virtuozzo:virtuozzo:vzkernel-firmware, p-cpe:/a:virtuozzo:virtuozzo:parallels-server-bm-release, p-cpe:/a:virtuozzo:virtuozzo:vzkernel, cpe:/o:virtuozzo:virtuozzo:6

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 11/21/2016

Reference Information

CVE: CVE-2016-1583, CVE-2016-6828, CVE-2016-7910, CVE-2016-7911

Detections

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