发布时间 :2001-06-18 00:00:00
修订时间 :2016-10-17 22:10:52

[原文]Cisco PIX Firewall 515 and 520 with 5.1.4 OS running aaa authentication to a TACACS+ server allows remote attackers to cause a denial of service via a large number of authentication requests.

[CNNVD]Cisco PIX防火墙服务拒绝漏洞(CNNVD-200106-095)

        带有5.1.4 OS的Cisco PIX防火墙515和520版本运行TACACS+服务器aaa认证时存在漏洞。远程攻击者可以借助超多认证请求导致服务拒绝。

- CVSS (基础分值)

CVSS分值: 5 [中等(MEDIUM)]
机密性影响: [--]
完整性影响: [--]
可用性影响: [--]
攻击复杂度: [--]
攻击向量: [--]
身份认证: [--]

- CPE (受影响的平台与产品)

cpe:/h:cisco:pix_firewall_515Cisco PIX Firewall 515
cpe:/h:cisco:pix_firewall_520Cisco PIX Firewall 520

- 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
(UNKNOWN)  BUGTRAQ  20010406 PIX Firewall 5.1 DoS Vulnerability
(UNKNOWN)  CISCO  20011003 Cisco PIX Firewall Authentication Denial of Service Vulnerability
(VENDOR_ADVISORY)  XF  cisco-pix-tacacs-dos(6353)

- 漏洞信息

Cisco PIX防火墙服务拒绝漏洞
中危 未知
2001-06-18 00:00:00 2005-05-13 00:00:00
        带有5.1.4 OS的Cisco PIX防火墙515和520版本运行TACACS+服务器aaa认证时存在漏洞。远程攻击者可以借助超多认证请求导致服务拒绝。

- 公告与补丁


- 漏洞信息 (20734)

Cisco PIX 4.x/5.x TACACS+ Denial of Service Vulnerability (EDBID:20734)
hardware remote
2001-04-06 Verified
0 Claudiu Calomfirescu
N/A [点击下载]

PIX is an enterprise firewall engineered and maintained by Cisco Systems. It is designed to provide robust features and multiple methods of access control and filtering.

A problem with the PIX could allow a denial of service. PIX firewalls using TACACS+ are vulnerable to a resource starvation attack which results in a denial of service. Upon receiving multiple requests for TACACS+ authentication from an unauthorized user, the firewalls resources can be exhausted. This causes the firewall to crash, requiring power cycling to resume regular service.

This makes it possible for a user from either the public or private side of the PIX to crash the firewall, and deny service to legitimate users.

All PIX Firewalls having configuration lines beginning with the following line are affected:
pixfirewall# aaa authentication

Any configurations not including aaa authentication are not affected. 

while (true); do (wget http://external.system 2>/dev/null &); done 		

- 漏洞信息

Cisco PIX Firewall AAA Authentication TACACS Remote DoS
Remote / Network Access Denial of Service
Loss of Availability Upgrade
Exploit Public Vendor Verified

- 漏洞描述

- 时间线

2001-04-06 Unknow
Unknow Unknow

- 解决方案

Upgrade to version 5.2.5 or higher, as it has been reported to fix this vulnerability. An upgrade is required as there are no known workarounds.

- 相关参考

- 漏洞作者

Unknown or Incomplete