NewStart CGSL MAIN 5.04 : kernel Multiple Vulnerabilities (NS-SA-2019-0014)

High Nessus Plugin ID 127165

New! Vulnerability Priority Rating (VPR)

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VPR Score: 6.7

Synopsis

The remote machine is affected by multiple vulnerabilities.

Description

The remote NewStart CGSL host, running version MAIN 5.04, has kernel packages installed that are affected by multiple vulnerabilities:

- A flaw was found in the Linux kernel's key management system where it was possible for an attacker to escalate privileges or crash the machine. If a user key gets negatively instantiated, an error code is cached in the payload area. A negatively instantiated key may be then be positively instantiated by updating it with valid data. However, the ->update key type method must be aware that the error code may be there. (CVE-2015-8539)

- A flaw was found in the way the Linux KVM module processed the trap flag(TF) bit in EFLAGS during emulation of the syscall instruction, which leads to a debug exception(#DB) being raised in the guest stack. A user/process inside a guest could use this flaw to potentially escalate their privileges inside the guest.
Linux guests are not affected by this. (CVE-2017-7518)

- A vulnerability was found in the Key Management sub component of the Linux kernel, where when trying to issue a KEYTCL_READ on a negative key would lead to a NULL pointer dereference. A local attacker could use this flaw to crash the kernel. (CVE-2017-12192)

- The Linux kernel built with the KVM visualization support (CONFIG_KVM), with nested visualization(nVMX) feature enabled (nested=1), was vulnerable to a stack buffer overflow issue. The vulnerability could occur while traversing guest page table entries to resolve guest virtual address(gva). An L1 guest could use this flaw to crash the host kernel resulting in denial of service (DoS) or potentially execute arbitrary code on the host to gain privileges on the system.
(CVE-2017-12188)

- A flaw was found in the Linux kernel's implementation of associative arrays introduced in 3.13. This functionality was backported to the 3.10 kernels in Red Hat Enterprise Linux 7. The flaw involved a null pointer dereference in assoc_array_apply_edit() due to incorrect node-splitting in assoc_array implementation. This affects the keyring key type and thus key addition and link creation operations may cause the kernel to panic.
(CVE-2017-12193)

- It was found that fanout_add() in 'net/packet/af_packet.c' in the Linux kernel, before version 4.13.6, allows local users to gain privileges via crafted system calls that trigger mishandling of packet_fanout data structures, because of a race condition (involving fanout_add and packet_do_bind) that leads to a use-after-free bug. (CVE-2017-15649)

- A vulnerability was found in the Linux kernel where the keyctl_set_reqkey_keyring() function leaks the thread keyring. This allows an unprivileged local user to exhaust kernel memory and thus cause a DoS.
(CVE-2017-7472)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Upgrade the vulnerable CGSL kernel packages. Note that updated packages may not be available yet. Please contact ZTE for more information.

See Also

http://security.gd-linux.com/notice/NS-SA-2019-0014

Plugin Details

Severity: High

ID: 127165

File Name: newstart_cgsl_NS-SA-2019-0014_kernel.nasl

Version: 1.2

Type: local

Published: 2019/08/12

Updated: 2019/09/24

Dependencies: 12634

Risk Information

Risk Factor: High

VPR Score: 6.7

CVSS Score Source: CVE-2015-8539

CVSS v2.0

Base Score: 7.2

Temporal Score: 5.6

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

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

CVSS v3.0

Base Score: 7.8

Temporal Score: 7

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:P/RL:O/RC:C

Vulnerability Information

Required KB Items: Host/local_checks_enabled, Host/ZTE-CGSL/release, Host/ZTE-CGSL/rpm-list, Host/cpu

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 2019/07/17

Vulnerability Publication Date: 2016/02/08

Reference Information

CVE: CVE-2015-8539, CVE-2017-7472, CVE-2017-7518, CVE-2017-12188, CVE-2017-12192, CVE-2017-12193, CVE-2017-15649