CVE-1999-0857
CVSS2.1
发布时间 :1999-12-01 00:00:00
修订时间 :2008-09-09 08:36:03
NMCOES    

[原文]FreeBSD gdc program allows local users to modify files via a symlink attack.


[CNNVD]FreeBSD gdc符号链接漏洞(CNNVD-199912-011)

        FreeBSD的gdc程序存在漏洞。本地用户可以通过一个符号链接攻击修改文件。

- CVSS (基础分值)

CVSS分值: 2.1 [轻微(LOW)]
机密性影响: NONE [对系统的机密性无影响]
完整性影响: PARTIAL [可能会导致系统文件被修改]
可用性影响: NONE [对系统可用性无影响]
攻击复杂度: LOW [漏洞利用没有访问限制 ]
攻击向量: LOCAL [漏洞利用需要具有物理访问权限或本地帐户]
身份认证: NONE [漏洞利用无需身份认证]

- CPE (受影响的平台与产品)

产品及版本信息(CPE)暂不可用

- OVAL (用于检测的技术细节)

未找到相关OVAL定义

- 官方数据库链接

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-1999-0857
(官方数据源) MITRE
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-1999-0857
(官方数据源) NVD
http://www.cnnvd.org.cn/vulnerability/show/cv_cnnvdid/CNNVD-199912-011
(官方数据源) CNNVD

- 其它链接及资源

http://www.securityfocus.com/bid/835
(UNKNOWN)  BID  835

- 漏洞信息

FreeBSD gdc符号链接漏洞
低危 其他
1999-12-01 00:00:00 2005-10-20 00:00:00
本地  
        FreeBSD的gdc程序存在漏洞。本地用户可以通过一个符号链接攻击修改文件。

- 公告与补丁

        Currently the SecurityFocus staff are not aware of any vendor supplied patches for this issue. If you feel we are in error or are aware of more recent information, please mail us at: vuldb@securityfocus.com.

- 漏洞信息 (19650)

FreeBSD 3.3 gdc Symlink Vulnerability (EDBID:19650)
freebsd local
1999-12-01 Verified
0 Brock Tellier
N/A [点击下载]
source: http://www.securityfocus.com/bid/835/info

It is possible to write debug ouput from gdc to a file (/var/tmp/gdb_dump). Unfortunately, gdc follows symbolic links which can be created in tmp and will overwrite any file on the system thanks to it being setiud root. This does not cause any immediate compromises and is more of a denial of service attack since it does not change the permissions of the overwritten files (to say, world writeable or group writeable). Local users are required to be in group wheel (or equivelent) to execute gdc.

ln -s /etc/master.passwd /var/tmp/gated_dump

And then wait for a priviliged user to run gdc dump.

		

- 漏洞信息

6000
FreeBSD gdc Symlink Arbitrary File Modification
Local Access Required Input Manipulation, Race Condition
Loss of Integrity
Exploit Public

- 漏洞描述

FreeBSD contains a flaw that may allow a malicious user to gain access to unauthorized privileges. The issue is triggered when a malicious user creates a symbolic link which is traversed by gdc when writing its debug ouput to a file, typically and inappropriately redirected to "/var/tmp/gated_dump" or "/var/tmp/gdb_dump". This flaw can be used to overwrite any file on the victim system as gdc runs setuid root and may consequently lead to a loss of integrity.

- 时间线

1999-11-30 Unknow
1999-11-30 Unknow

- 解决方案

Currently, there are no known upgrades, patches, or workarounds available to correct this issue.

- 相关参考

- 漏洞作者

- 漏洞信息

FreeBSD gdc Symlink Vulnerability
Origin Validation Error 835
No Yes
1999-12-01 12:00:00 2009-07-11 12:56:00
First posted to BugTraq by Brock Tellier <btellier@usa.net> on December 1, 1999.

- 受影响的程序版本

FreeBSD FreeBSD 3.3

- 漏洞讨论

It is possible to write debug ouput from gdc to a file (/var/tmp/gdb_dump). Unfortunately, gdc follows symbolic links which can be created in tmp and will overwrite any file on the system thanks to it being setiud root. This does not cause any immediate compromises and is more of a denial of service attack since it does not change the permissions of the overwritten files (to say, world writeable or group writeable). Local users are required to be in group wheel (or equivelent) to execute gdc.

- 漏洞利用

ln -s /etc/master.passwd /var/tmp/gated_dump

And then wait for a priviliged user to run gdc dump.

- 解决方案

Currently the SecurityFocus staff are not aware of any vendor supplied patches for this issue. If you feel we are in error or are aware of more recent information, please mail us at: vuldb@securityfocus.com.

- 相关参考

     

     

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