Important kernel security update: CVE-2017-8797 and other; Virtuozzo ReadyKernel patch 25.0 for Virtuozzo 7.0.4 and 7.0.4 HF3

Issue date: 2017-07-05

Applies to: Virtuozzo 7.0

Virtuozzo Advisory ID: VZA-2017-063

1. Overview

The cumulative Virtuozzo ReadyKernel patch was updated with security fixes. The patch applies to Virtuozzo kernels 3.10.0-514.16.1.vz7.30.10 (Virtuozzo 7.0.4) and 3.10.0-514.16.1.vz7.30.15 (Virtuozzo 7.0.4 HF3).

2. Security Fixes

[Important] The NFSv4 server in the Linux kernel compiled with CONFIG_NFSD_PNFS enabled does not properly validate layout type when processing NFSv4 pNFS LAYOUTGET and GETDEVICEINFO operands. The attack payload fits to single one-way UDP packet. The provided input value is used for array dereferencing. This may lead to a remote DoS of [knfsd] and so to a soft-lockup of a whole system. (CVE-2017-8797)
[Important] A flaw was found in the way Linux kernel allocates heap memory to build the scattergather list from a fragment list(skb_shinfo(skb)->frag_list) in the socket buffer(skb_buff). The heap overflow occurred if ‘MAX_SKB_FRAGS + 1’ parameter and ‘NETIF_F_FRAGLIST’ feature are both used together. A remote user or process could use this flaw to potentially escalate their privilege on a system. (CVE-2017-7477)
[Moderate] A vulnerability was found in the implementation of setsockopt() operations in the Linux kernel. A privileged user inside a container could cause a DoS attack on the host (kernel deadlock in ip_ra_control() function) using a specially crafted sequence of system calls. (PSBM-64752)

3. Installing the Update

Download, install, and instantly apply the patch to the current kernel by running ‘readykernel update’.

4. References

The JSON file with the list of new and updated packages is available at JSON file.