CVE:CVE-2009-0834
CNNVD:CNNVD-200903-160
Linux kernel是美国Linux基金会发布的开源操作系统Linux所使用的内核。NFSv4 implementation是其中的一个分布式文件系统协议。
Syscall过滤技术通常基于由编号确定的syscall或具体参数来确认是否允许执行调用。在通过编号确定syscall时，64位Linux内核(x86_64)上syscall编号可能既映射到32位又映射到64位的syscall表，而这两种syscall表是不同的。由于用户空间进程是由syscall表控制的，因此可以绕过syscall编号检查，执行非授权操作。
例如，syscall过滤技术可能在监控64位进程，且配置为允许常见的open() syscall的子集，在64位平台上为syscall number 2。但是，被监控的进程可以切换到32位模式并发布syscall 2，这对于监控程序为open()，但在内核中执行为fork()。
solution:Upgrade linux linux_kernel to a higher version than 2.6.28.7,and avoid the version (,2.6.28.7]; Upgrade debian debian_linux to a higher version than 4.0,5.0,and avoid the version 4.0,5.0; Upgrade canonical ubuntu_linux to a higher version than 7.10,8.04,8.10,and avoid the version 7.10,8.04,8.10; Upgrade redhat enterprise_linux_desktop to a higher version than 4.0,5.0,and avoid the version 4.0,5.0; Upgrade redhat enterprise_linux_eus to a higher version than 4.7,5.3,and avoid the version 4.7,5.3; Upgrade redhat enterprise_linux_server to a higher version than 4.0,5.0,and avoid the version 4.0,5.0; Upgrade redhat enterprise_linux_server_aus to a higher version than 5.3,and avoid the version 5.3; Upgrade redhat enterprise_linux_workstation to a higher version than 4.0,5.0,and avoid the version 4.0,5.0; Upgrade opensuse opensuse to a higher version than 10.3,11.0,and avoid the version 10.3,11.0; Upgrade suse linux_enterprise_desktop to a higher version than 10:sp2,and avoid the version 10:sp2; Upgrade suse linux_enterprise_server to a higher version than 10:sp2,and avoid the version 10:sp2; Upgrade suse linux_enterprise_software_development_kit to a higher version than 10:sp2,and avoid the version 10:sp2