Local denial of service in Red Hat rhev-hypervisor

1) Resource management error

EUVDB-ID: #VU5869

Risk: Low

CVSSv3.1: 6.4 [CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2017-6074

CWE-ID: CWE-399 - Resource Management Errors

Exploit availability: Yes

Description

The vulnerability allows a local user to cause kernel panic.

The vulnerability exists due to invalid free in the dccp_rcv_state_process() function in net/dccp/input.c file in the Linux kernel through 4.9.11 when processing DCCP_PKT_REQUEST packet data structures in the LISTEN state. A local user can use userspace application to make an IPV6_RECVPKTINFO setsockopt system call and cause kernel panic.

Successful exploitation of this vulnerability may result in denial of service condition.

Mitigation

Install the following patches:

Red Hat Virtualization 7

SRPM
rhev-hypervisor7-7.3-20170425.0.el7ev.src.rpm	SHA-256: 6973648f6d19fedfc32050ac7cd567cc9037ce01406375a92f03f96dabfb069a
x86_64
rhev-hypervisor7-7.3-20170425.0.el7ev.noarch.rpm	SHA-256: a1f826d150fd2d960dba63f219b2274eb4a1df1fc812b66a3afc5250e747a89c

Red Hat Virtualization 6

SRPM
rhev-hypervisor7-7.3-20170425.0.el6ev.src.rpm	SHA-256: bba110dcb5a179cd39ba91b7874617ecf62bfbedf9dd5a2492138dd6fefc2001
x86_64
rhev-hypervisor7-7.3-20170425.0.el6ev.noarch.rpm	SHA-256: c03153d5d24b8667677351e12e534d7e261f136063eead211b37cc90a8ad71b9

Vulnerable software versions

Red Hat Virtualization: 6 - 7

External links

http://access.redhat.com/errata/RHSA-2017:1209

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

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.