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Kernel security update: CVE-2017-9077 and other; new kernel 2.6.32-042stab123.4, Virtuozzo 6.0 Update 12 Hotfix 10 (6.0.12-3677)

Last Updated: Jun 13, 2017 10:42AM UTC

Issue date: 2017-06-13

Affected products: Virtuozzo 6.0

Virtuozzo Advisory ID: VZA-2017-047

1. Overview

This update provides a new kernel 2.6.32-042stab123.4 for Virtuozzo 6.0. The new kernel is based on the Red Hat Enterprise Linux 6.9 kernel 2.6.32-696.el6 and provides security fixes as well as stability bug fixes.

2. Security Fixes

  • [Moderate] The tcp_v6_syn_recv_sock function in net/ipv6/tcp_ipv6.c in the Linux kernel mishandles inheritance, which allows local users to cause a denial of service or possibly have unspecified other impact via crafted system calls, a related issue to CVE-2017-8890. An unprivileged local user could use this flaw to induce kernel memory corruption on the system, leading to a crash. Due to the nature of the flaw, privilege escalation cannot be fully ruled out, although we believe it is unlikely. (CVE-2017-9077)
  • [Moderate] The IPv6 DCCP implementation in the Linux kernel mishandles inheritance, which allows local users to cause a denial of service or possibly have unspecified other impact via crafted system calls, a related issue to CVE-2017-8890. An unprivileged local user could use this flaw to induce kernel memory corruption on the system, leading to a crash. Due to the nature of the flaw, privilege escalation cannot be fully ruled out, although we believe it is unlikely. (CVE-2017-9076)
  • [Moderate] The sctp_v6_create_accept_sk function in net/sctp/ipv6.c in the Linux kernel mishandles inheritance, which allows local users to cause a denial of service or possibly have unspecified other impact via crafted system calls, a related issue to CVE-2017-8890. An unprivileged local user could use this flaw to induce kernel memory corruption on the system, leading to a crash. Due to the nature of the flaw, privilege escalation cannot be fully ruled out, although we believe it is unlikely. (CVE-2017-9075)
  • [Moderate] The IPv6 fragmentation implementation in the Linux kernel through 4.11.1 does not consider that the nexthdr field may be associated with an invalid option, which allows local users to cause a denial of service (out-of-bounds read and BUG) or possibly have unspecified other impact via crafted socket and send system calls. (CVE-2017-9074)
  • [Moderate] The inet_csk_clone_lock function in net/ipv4/inet_connection_sock.c in the Linux kernel allows attackers to cause a denial of service (double free) or possibly have unspecified other impact by leveraging use of the accept system call. An unprivileged local user could use this flaw to induce kernel memory corruption on the system, leading to a crash. Due to the nature of the flaw, privilege escalation cannot be fully ruled out, although we believe it is unlikely. (CVE-2017-8890)
  • [Low] Improved isolation for neighbor table settings. (The fix added to the 042stab120.19 kernel was incomplete.) (PSBM-59962)

3. Bug Fixes

  • delayfs should not be mounted manually. (PSBM-66818)
  • Disabled HWID generation for certain virtual interfaces (VLAN/VXLAN/IPIP/dummy). (PSBM-62215)

4. Installing the Update

Install the update by running 'yum update'.

5. References

The JSON file with the list of new and updated packages is available at http://docs.virtuozzo.com/vza/VZA-2017-047.json.

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