IBM Lenovo_7cetb5ww 信息泄露漏洞

QQ空间 新浪微博 微信 QQ facebook twitter
漏洞ID 1185502 漏洞类型 信息泄露
发布时间 2008-09-03 更新时间 2008-09-03
CVE编号 CVE-2008-3894 CNNVD-ID CNNVD-200809-038
漏洞平台 N/A CVSS评分 2.1
|漏洞来源
https://www.securityfocus.com/bid/84851
https://cxsecurity.com/issue/WLB-2008090085
http://www.cnnvd.org.cn/web/xxk/ldxqById.tag?CNNVD=CNNVD-200809-038
|漏洞详情
Lenovo固件7CETB5WW是一个bios程序。IBMLenovo固件7CETB5WW2.05在BIOS键盘缓冲区内储存pre-boot权限密码而且不会在使用后清空该缓冲区,本地用户可以通过读取与该缓冲区有关的物理内存位置来获得敏感信息。
|漏洞EXP
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

- -----------------------------------------------------------------------
[ iViZ Security Advisory 08-005                            25/08/2008 ]
- -----------------------------------------------------------------------
iViZ Techno Solutions Pvt. Ltd.
                                            http://www.ivizsecurity.com
- -----------------------------------------------------------------------

* Title:     IBM Lenovo BIOS Plain Text Password Disclosure
* Date:      25/08/2008
* Software:  IBM Lenovo BIOS

- --[ Synopsis:

Like most BIOSes, IBM Lenovo's firmware 7CETB5WW v2.05  (10/13/2006)
    can be used to ask a password to users at boot time to implement a
    pre-boot authentication.

The password checking routine of this firmware fails to sanitize the
    BIOS keyboard buffer after reading user input, resulting in plain
    text password leakage to local users.

- --[ Affected Software:

* IBM Lenovo 7CETB5WW v2.05  (10/13/2006) BIOS
  (possibly others too)

- --[ Technical description:

The BIOS's pre-boot authentication routines use the BIOS API to
    read user input via the keyboard. The BIOS internally copies the
    keystrokes in a RAM structure called the BIOS Keyboard buffer
    inside the BIOS Data Area. This buffer is not flushed after use,
    resulting in potential plain text password leakage once the OS
    is fully booted, assuming the attacker can read the password at
    physical memory location 0x40:0x1e.

- --[ Impact:

Plain text password disclosure. Local access is required, but no
    physical access to the machine.

The level of privilege required to retrieve the password from memory
    is OS dependent and varies from guest user under Microsoft Windows
    (any) to root user under most Unix based OSes.

- --[ Full Technical Whitepaper

http://www.ivizsecurity.com/research/preboot/preboot_whitepaper.pdf

- --[ Vendor response:

* No Response from vendor in spite of multiple solicitations.

- --[ Credits:

This vulnerability was discovered by Security Researcher
    Jonathan Brossard from iViZ Techno Solutions Pvt. Ltd.

- --[ Disclosure timeline:

* First private disclosure to vendor on July 15th 2008
  * First Public disclosure at Defcon 16 on August 10th 2008

- --[ Reference:

http://www.ivizsecurity.com/security-advisory.html
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.7 (MingW32)

iD8DBQFIsnavkcchhz1mT/IRAtvNAJ4v6ipZ4LAdgKIiiyETxcLdSlktYACgkZTr
7vtu8xQMJ7TZgftfYt/WMoM=
=/O0V
-----END PGP SIGNATURE-----
|受影响的产品
IBM Lenovo 7Cetb5ww 2.05
|参考资料

来源:BUGTRAQ
名称:20080825[IVIZ-08-005]IBMLenovoBIOSPlainTextPasswordDisclosure
链接:http://www.securityfocus.com/archive/1/archive/1/495808/100/0/threaded
来源:MISC
链接:http://www.ivizsecurity.com/research/preboot/preboot_whitepaper.pdf
来源:MISC
链接:http://www.ivizsecurity.com/preboot-patch.html
来源:SREASON
名称:4207
链接:http://securityreason.com/securityalert/4207