Secustar Drivecrypt_plus_pack 信息泄露漏洞

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漏洞ID 1185501 漏洞类型 信息泄露
发布时间 2008-09-03 更新时间 2009-01-29
CVE编号 CVE-2008-3898 CNNVD-ID CNNVD-200809-042
漏洞平台 N/A CVSS评分 2.1
|漏洞来源
https://cxsecurity.com/issue/WLB-2008090090
http://www.cnnvd.org.cn/web/xxk/ldxqById.tag?CNNVD=CNNVD-200809-042
|漏洞详情
SecuStarDriveCryptPlusPack是一款磁盘加密软件。SecuStarDriveCryptPlusPack3.9s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-----
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- -----------------------------------------------------------------------
[ iViZ Security Advisory 08-007                            25/08/2008 ]
- -----------------------------------------------------------------------
iViZ Techno Solutions Pvt. Ltd.
                                            http://www.ivizsecurity.com
- -----------------------------------------------------------------------

* Title:     DriveCrypt Security Model bypass exploiting wrong BIOS API
             usage
* Date:      25/08/2008
* Software:  DriveCrypt

- --[ Synopsis:

The password checking routine of DriveCrypt fails to sanitize the
    BIOS keyboard buffer before AND after reading passwords.

- --[ Affected Software:

* Secu Star's DriveCrypt Plus Pack v3.9 (possibly other versions also)

- --[ Technical description:

DriveCrypt'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. It is also possible for a root
    user to reboot the computer by instrumenting the BIOS keyboard
    buffer in spite of the full disk encryption.

- --[ Impact:

1) Plain text password disclosure.
     Required privileges to perform this operation are OS dependant,
     from unprivileged users under Windows (any), to root under most
     Unix.

2) A privileged attacker able to write to the MBR and knowing the
     password (for instance thanks to 1), is able to reboot the computer
     in spite of the password prompted at boot time (and in spite of
     disk encryption) by initializing the BIOS keybaord buffer with the
     correct password (using an intermediary bootloader that will in turn
     run DriveCrypt).

- --[ 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

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|参考资料

来源:BID
名称:30818
链接:http://www.securityfocus.com/bid/30818
来源:BUGTRAQ
名称:20080825[IVIZ-08-007]DriveCryptSecurityModelbypassexploitingwrongBIOSAPIusage
链接:http://www.securityfocus.com/archive/1/archive/1/495803/100/0/threaded
来源:MISC
链接:http://www.ivizsecurity.com/security-advisory-iviz-sr-0807.html
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:4213
链接:http://securityreason.com/securityalert/4213
来源:SECUNIA
名称:31605
链接:http://secunia.com/advisories/31605