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Parallels Cloud Server 6.0 Update 6 Hotfix 10 (6.0.6-2007)

Last Updated: Sep 08, 2016 03:24PM UTC
Synopsis:          A Parallels Cloud Server 6.0 kernel update
                   introducing a security fix.
Product:           Parallels Cloud Server 6.0
Keywords:          'security'
1. What's Included in This Update
This update includes a new Parallels Cloud Server 6.0 kernel (2.6.32-042stab092.2) based on the Red Hat Enterprise Linux 6.5 kernel (2.6.32-431.20.3.el6). The new kernel introduces a security fix.
2. Bug Fixes
- A critical issue in the Linux kernel's ptrace subsystem code could allow unprivileged local Container users to crash the host system and likely gain host system's root privileges. (#PSBM-27973)
  On Intel CPUs, sysret to non-canonical address causes a fault on the sysret instruction itself after the stack pointer is set to a user mode value but before the CPL is changed. Systems running on AMD CPUs are not vulnerable to this issue as sysret on AMD CPUs does not generate a fault before the CPL change.
  It was found that certain Linux kernel's ptrace subsystem code paths allow the tracer to set tracee's instruction pointer to non-canonical address which is later used on tracee's return to user mode via the sysret instruction, effectively bypassing the hardening introduced via the fixes for CVE-2005-1764 (introduced guard page between the end of the user-mode accessible virtual address space and the beginning of the non-canonical) and CVE-2006-0744 (system call handler hardening).
3. Obtaining the Update
You can download and install the update using the yum utility included in the Parallels Cloud Server 6.0 distribution.
4. References
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