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F5 Networks BIG-IP : Linux kernel vulnerabilities (K31026324)

critical Nessus Plugin ID 87905

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Synopsis

The remote device is missing a vendor-supplied security patch.

Description

CVE-2015-2925

The prepend_path function in fs/dcache.c in the Linux kernel before 4.2.4 does not properly handle rename actions inside a bind mount, which allows local users to bypass an intended container protection mechanism by renaming a directory, related to a 'double-chroot attack.'

CVE-2015-5307 The KVM subsystem in the Linux kernel through 4.2.6, and Xen 4.3.x through 4.6.x, allows guest OS users to cause a denial of service (host OS panic or hang) by triggering many #AC (aka Alignment Check) exceptions, related to svm.c and vmx.c.

CVE-2015-8104 The KVM subsystem in the Linux kernel through 4.2.6, and Xen 4.3.x through 4.6.x, allows guest OS users to cause a denial of service (host OS panic or hang) by triggering many #DB (aka Debug) exceptions, related to svm.c.

Impact

A local user may be able to bypass a container protection mechanism by renaming a directory, or cause a denial of service (DoS) to the system by triggering certain exceptions.

Solution

Upgrade to one of the non-vulnerable versions listed in the F5 Solution K31026324.

See Also

https://support.f5.com/csp/article/K31026324

Plugin Details

Severity: Critical

ID: 87905

File Name: f5_bigip_SOL31026324.nasl

Version: 2.13

Type: Local

Published: 1/14/2016

Updated: 10/21/2026

Configuration: Enable paranoid mode

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: High

Score: 7.6

Percentile: 98.96

CVSS v2

Risk Factor: Medium

Base Score: 6.9

Temporal Score: 6

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

CVSS Score Source: CVE-2015-2925

CVSS v3

Risk Factor: Critical

Base Score: 10

Temporal Score: 9.5

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

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

CVSS Score Source: CVE-2015-5307

Vulnerability Information

CPE: cpe:/a:f5:big-ip_access_policy_manager, cpe:/a:f5:big-ip_advanced_firewall_manager, cpe:/a:f5:big-ip_application_acceleration_manager, cpe:/a:f5:big-ip_application_security_manager, cpe:/a:f5:big-ip_application_visibility_and_reporting, cpe:/a:f5:big-ip_global_traffic_manager, cpe:/a:f5:big-ip_link_controller, cpe:/a:f5:big-ip_local_traffic_manager, cpe:/a:f5:big-ip_policy_enforcement_manager, cpe:/a:f5:big-ip_wan_optimization_manager, cpe:/a:f5:big-ip_webaccelerator, cpe:/h:f5:big-ip, cpe:/h:f5:big-ip_protocol_security_manager

Required KB Items: Host/local_checks_enabled, Settings/ParanoidReport, Host/BIG-IP/hotfix, Host/BIG-IP/modules, Host/BIG-IP/version

Exploit Ease: No known exploits are available

Patch Publication Date: 1/13/2016

Vulnerability Publication Date: 11/16/2015

Reference Information

CVE: CVE-2015-2925, CVE-2015-5307, CVE-2015-8104

BID: 73926