发布时间 :2001-02-16 00:00:00
修订时间 :2008-09-05 16:23:06

[原文]KTH Kerberos IV allows local users to specify an alternate proxy using the krb4_proxy variable, which allows the user to generate false proxy responses and possibly gain privileges.

[CNNVD]KTH Kerberos IV漏洞(CNNVD-200102-114)

        KTH Kerberos IV存在漏洞。本地用户使用krb4_proxy变量说明交替的代理人,用户产生错误代理人响应回应和可能提升特权。

- CVSS (基础分值)

CVSS分值: 7.2 [严重(HIGH)]
机密性影响: COMPLETE [完全的信息泄露导致所有系统文件暴露]
完整性影响: COMPLETE [系统完整性可被完全破坏]
可用性影响: COMPLETE [可能导致系统完全宕机]
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
(PATCH)  BUGTRAQ  20001210 KTH upgrade and FIX
(VENDOR_ADVISORY)  BUGTRAQ  20001208 Vulnerabilities in KTH Kerberos IV
(VENDOR_ADVISORY)  XF  kerberos4-arbitrary-proxy

- 漏洞信息

KTH Kerberos IV漏洞
高危 未知
2001-02-16 00:00:00 2006-09-27 00:00:00
        KTH Kerberos IV存在漏洞。本地用户使用krb4_proxy变量说明交替的代理人,用户产生错误代理人响应回应和可能提升特权。

- 公告与补丁


- 漏洞信息 (20491)

KTH Kerberos 4 Arbitrary Proxy Usage Vulnerability (EDBID:20491)
multiple remote
2000-12-08 Verified
0 Jouko Pynnonen
N/A [点击下载]

Kerberos is a widely used network service authentication system. The version of Kerberos developed and maintained by KTH (Swedish Royal Institute of Technology) contains a vulnerability that may allow/assist in a local or remote root compromise.

KTH Kerberos uses an environment variable called 'krb4_proxy' when a proxy server is required to retrieve tickets via HTTP. KTH Kerberos-supported services will contact the supplied proxy server (the value of krb4_proxy) instead of the default Kerberos server if this variable is set.

It is possible for malicious remote users (before authenticating) to remotely set the value of this variable and have the server program contact a fake Kerberos server. This would allow the attacker to intercept authentication requests and/or send false replies to the service they are attempting to use. An attacker, for example, could send the environment variable via telnet to a Kerberos supporting telnet daemon.

This attack allows malicious users in control of a fake Kerberos server to exploit a buffer overflow vulnerability (See Bugtraq ID 2091) in the Kerberos shared libraries with malformed replies. If exploited, the combined vulnerabilities may provide remote root access to attackers. 

telnet> environ define krb4_proxy
telnet> environ export krb4_proxy
telnet> open localhost 		

- 漏洞信息

KTH Kerberos 4 krb4_proxy False Response Remote Privilege Escalation
Local Access Required Authentication Management
Loss of Confidentiality, Loss of Integrity
Exploit Public

- 漏洞描述

- 时间线

2000-12-08 Unknow
2000-12-08 Unknow

- 解决方案





- 相关参考

- 漏洞作者