Linux Kernel 'nfs4_proc_lock()'本地拒绝服务漏洞
来源：岁月联盟
时间：2009-11-08
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Linux kernel 2.6.11.4漏洞描述:
Bugraq ID: 36936
CVE ID：CVE-2009-3726
Linux是一款开放源代码的操作性系统。
Linux Kernel ’nfs4_proc_lock()’函数对Null值检查缺少充分检查，本地安全者可以利用漏洞对系统进行拒绝服务安全。
Null指针引用触发发生在_nfs4_proc_setlk函数的起始部分：
static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct
file_lock *request)
{
struct nfs_client *clp = state->owner->so_client;
尝试引用state->owner时可触发Oops，根据反汇编显示’state’已经为Null值：
fbf: ab stos %eax,%es:(%rdi)
fc0: ab stos %eax,%es:(%rdi)
fc1: ab stos %eax,%es:(%rdi)
fc2: 49 8b 45 30 mov 0x30(%r13),%rax <== oops
here
fc6: 4c 89 e6 mov %r12,%rsi
fc9: 4c 89 ef mov %r13,%rdi
这意味着nfs4_proc_lock对变量’state’缺少充分检查，提交Null值给nfs4_proc_setlk时可导致触发Oops。<*参考
https://bugzilla.redhat.com/show_bug.cgi?id=529227#c0
http://www.spinics.net/linux/lists/linux-nfs/msg03357.html
*>
测试方法:
[www.sebug.net]
本站提供程序(方法)可能带有安全性,仅供安全研究与教学之用,风险自负!通过如下步骤可重现此漏洞：
-wget http://www.genoscope.cns.fr/externe/redhat/XMLMissingField
-保存在NFSv4挂接目录上
-执行之SEBUG安全建议:
厂商解决方案
用户可参考如下安全公告获得补丁信息：
http://permalink.gmane.org/gmane.comp.security.oss.general/2283
