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HistoryMay 07, 2018 - 12:00 a.m.

Kernel security update: Virtuozzo ReadyKernel patch 49.0 for Virtuozzo 7.0.1, 7.0.3, 7.0.5, 7.0.6, and 7.0.6 HF3


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The cumulative Virtuozzo ReadyKernel patch was updated with security and stability fixes. The patch applies to Virtuozzo 7.0 kernels 3.10.0-327.42.0.vz7.18.7 (7.0.1), 3.10.0-327.42.0.vz7.20.18 (7.0.3), 3.10.0-514.26.1.vz7.33.22 (7.0.5), 3.10.0-693.1.1.vz7.37.30 (7.0.6), and 3.10.0-693.11.6.vz7.40.4 (7.0.6 HF3). NOTE: No more patches are planned for kernel 3.10.0-327.47.0.vz7.18.7, support for which ends with this update.
Vulnerability id: CVE-2017-17448
It was discovered that nfnl_cthelper_list structure was accessible to any user with CAP_NET_ADMIN capability in a network namespace. An unprivileged local user could exploit that to affect netfilter conntrack helpers on the host.

Vulnerability id: CVE-2017-17449
It was discovered that a nlmon link inside a child network namespace was not restricted to that namespace. An unprivileged local user could exploit that to monitor system-wide netlink activity.

Vulnerability id: CVE-2017-17450
It was discovered that xt_osf_fingers data structure was accessible from any network namespace. This allowed unprivileged local users to bypass intended access restrictions and modify the system-wide OS fingerprint list used by specific iptables rules.

Vulnerability id: CVE-2017-17807
The KEYS subsystem omitted an access-control check when writing a key to the default keyring of the current task, allowing a local user to bypass security checks for the keyring. This compromised the validity of the keyring for those who relied on it.

Vulnerability id: PSBM-83692
If ‘dccp_ipv6’ module was loaded on the host, a local unprivileged user could trigger a kernel crash in dccp_write_xmit() or inet_csk_get_port() using a specially crafted sequence of system calls.