NetBSD权限漏洞

漏洞信息详情

NetBSD权限漏洞

• CNNVD编号：CNNVD-200105-017
• 危害等级： 高危
  
  
• CVE编号：
  CVE-2001-0268
  
• 漏洞类型：
  
  
  输入验证
  
• 发布时间：
  
  2001-05-03
  
• 威胁类型：
  
  
  本地
  
• 更新时间：
  
  2006-11-14
  
• 厂        商：
  
  openbsd
• 漏洞来源：
  This vulnerability…

NetBSD 1.5及其早期版本，OpenBSD 2.8及其早期版本中的i386_set_ldt系统调用不验证调用门目标，当USER_LDT核心选项启用时，本地用户可以通过创建具有指定任意内核地址的目标的Local Descriptor Table (LDT)中的段调用门获取根权限。

NetBSD and Sun Microsystems have released patches which correct this vulnerability.
NetBSD has released a kernel patch which may be applied to any of the 1.4x kernel series, as well as version 1.5.
OpenBSD has released a kernel patch for version 2.8.
It is possible to work around tihs vulnerability by building a kernel without the USER_LDT option enabled. In NetBSD it is enabled by default. To disable it, comment it out from the kernel configuration file and rebuild the kernel. If it has been enabled in OpenBSD, it can be disabled in the same manner. For the changes to take effect, both systems must be rebooted with the new kernel installed.
After kernel patches have been installed, the kernel must be rebuilt and the system must be rebooted with the new version.
Sun has released fix information for Solaris.
The fixes for Solaris 7 and 8, x86 versions are available as of this writing. A fix for Solaris 2.6 x86 will be available June 18.
Fixes for versions of Trusted Solaris are not yet available, but should be soon.
The IDs of the Sun fixes are below.
Sun Solaris 8_x86

• Sun 108529-07
  

NetBSD NetBSD 1.4 x86

• NetBSD netbsd-user_ldt.patch
  
  http://www.securityfocus.com/data/vulnerabilities/patches/netbsd-user_
  ldt.patch

NetBSD NetBSD 1.4.1 x86

• NetBSD netbsd-user_ldt.patch
  
  http://www.securityfocus.com/data/vulnerabilities/patches/netbsd-user_
  ldt.patch

NetBSD NetBSD 1.4.2 x86

• NetBSD netbsd-user_ldt.patch
  
  http://www.securityfocus.com/data/vulnerabilities/patches/netbsd-user_
  ldt.patch

Sun Solaris 2.6 _x86

• Sun 105182-27
  

OpenBSD OpenBSD 2.8

• OpenBSD obsd-022_userldt.patch
  
  http://www.securityfocus.com/data/vulnerabilities/patches/obsd-022_use
  rldt.patch

Sun Solaris 7.0 _x86

• Sun 106542-16
  

Sun Trusted Solaris 7.0 x86

• Sun 109597-05
  

Sun Trusted Solaris 8.0 x86

• Sun 110338-02
  

来源:US-CERT Vulnerability Note: VU#358960
名称: VU#358960
链接:http://www.kb.cert.org/vuls/id/358960

来源: NETBSD
名称: NetBSD-SA:2001-002
链接:http://archives.neohapsis.com/archives/netbsd/2001-q1/0093.html

来源: XF
名称: user-ldt-validation(6222)
链接:http://xforce.iss.net/xforce/xfdb/6222

来源: BID
名称: 2739
链接:http://www.securityfocus.com/bid/2739

来源: OSVDB
名称: 6141
链接:http://www.osvdb.org/6141

来源: OPENBSD
名称: 20010302 The USER_LDT kernel option allows an attacker to gain access to privileged areas of kernel memory.
链接:http://www.openbsd.org/errata.html#userldt

来源: CALDERA
名称: CSSA-2001-SCO.35
链接:http://archives.neohapsis.com/archives/linux/caldera/2001-q4/0014.html

来源: BUGTRAQ
名称: 20010219 Re: your mail
链接:http://archives.neohapsis.com/archives/bugtraq/2001-02/0353.html