发布时间 :2001-01-09 00:00:00
修订时间 :2017-10-09 21:29:31

[原文]telnetd in FreeBSD 4.2 and earlier, and possibly other operating systems, allows remote attackers to cause a denial of service by specifying an arbitrary large file in the TERMCAP environmental variable, which consumes resources as the server processes the file.

[CNNVD]FreeBSD telnetd服务拒绝漏洞(CNNVD-200101-093)

        FreeBSD 4.2版本及之前版本,以及可能其他的操作系统中的telnetd存在漏洞。远程攻击者可以通过指定TERMCAP环境变量中的任意超大文件来导致服务拒绝,该漏洞可以作为服务器进程文件来消耗资源。

- 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:/o:freebsd:freebsd:3.0FreeBSD 3.0
cpe:/o:freebsd:freebsd:4.0FreeBSD 4.0
cpe:/o:freebsd:freebsd:4.1FreeBSD 4.1
cpe:/o:freebsd:freebsd:4.1.1FreeBSD 4.1.1

- 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)  XF  telnetd-termcap-dos(5959)

- 漏洞信息

FreeBSD telnetd服务拒绝漏洞
中危 未知
2001-01-09 00:00:00 2005-05-02 00:00:00
        FreeBSD 4.2版本及之前版本,以及可能其他的操作系统中的telnetd存在漏洞。远程攻击者可以通过指定TERMCAP环境变量中的任意超大文件来导致服务拒绝,该漏洞可以作为服务器进程文件来消耗资源。

- 公告与补丁


- 漏洞信息

FreeBSD telnetd TERMCAP Environment Variable DoS
Remote / Network Access Denial of Service
Loss of Availability
Exploit Public

- 漏洞描述

FreeBSD contains a flaw that may allow a remote denial of service. The issue is triggered when a malicious user submits a request for an arbitrary large file in the TERMCAP environment variable to telnetd, which consumes cpu resources as the server processes the request, and will result in loss of availability for the platform.

- 时间线

2000-11-14 Unknow
Unknow Unknow

- 解决方案

Upgrade to version 4.1.1-STABLE or 3.5.1-STABLE after the respective correction dates, as it has been reported to fix this vulnerability. It is also possible to correct the flaw by implementing the following workaround(s): disable the telnet service in /etc/inetd.conf or use TCP wrappers. Enabled telnet in /etc/inetd.conf (vulnerable): telnet stream tcp nowait root /usr/libexec/telnetd telnetd telnet stream tcp6 nowait root /usr/libexec/telnetd telnetd Disabled telnet in /etc/inetd.conf (not vulnerable): #telnet stream tcp nowait root /usr/libexec/telnetd telnetd #telnet stream tcp6 nowait root /usr/libexec/telnetd telnetd

- 相关参考

- 漏洞作者