CVE-2002-0426
CVSS7.5
发布时间 :2002-08-12 00:00:00
修订时间 :2008-09-05 16:27:59
NMCOS    

[原文]VPN Server module in Linksys EtherFast BEFVP41 Cable/DSL VPN Router before 1.40.1 reduces the key lengths for keys that are supplied via manual key entry, which makes it easier for attackers to crack the keys.


[CNNVD]Linksys BEFVP41密钥截断漏洞(CNNVD-200208-084)

        
        BEFVP41是种硬件路由器,目前由Linksys开发、维护。
        BEFVP41分别支持如下长度的Triple DES加密密钥(48个16进制字符)、MD5校验密钥(32个16进制字符)
        Encryption:
        80C4DAFD9AFC3D7AB57079E19DEBFFF43538A62039768D74
        Authentication:
        32EA72F58D7F1E063E14A3FF78131172
        但是由于设计上的错误,当用户试图手工输入这些密钥时,被错误地截断了,分别成为23个16进制字符、19个16进制字符
        Encryption:
        80C4DAFD9AFC3D7AB57079E
        Authentication:
        32EA72F58D7F1E063E1
        这导致最终使用了弱密钥,暴力穷举攻击成功的可能性加大。
        

- CVSS (基础分值)

CVSS分值: 7.5 [严重(HIGH)]
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: [--]
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-2002-0426
(官方数据源) MITRE
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2002-0426
(官方数据源) NVD
http://www.cnnvd.org.cn/vulnerability/show/cv_cnnvdid/CNNVD-200208-084
(官方数据源) CNNVD

- 其它链接及资源

http://www.securityfocus.com/bid/4250
(VENDOR_ADVISORY)  BID  4250
http://www.iss.net/security_center/static/8397.php
(VENDOR_ADVISORY)  XF  linksys-etherfast-weak-encryption(8397)
http://online.securityfocus.com/archive/1/260613
(VENDOR_ADVISORY)  BUGTRAQ  20020308 Linksys BEFVP41 VPN Server does not follow proper VPN standards
ftp://ftp.linksys.com/pub/befsr41/befvp41-1402.zip
(UNKNOWN)  MISC  ftp://ftp.linksys.com/pub/befsr41/befvp41-1402.zip

- 漏洞信息

Linksys BEFVP41密钥截断漏洞
高危 设计错误
2002-08-12 00:00:00 2005-10-20 00:00:00
远程  
        
        BEFVP41是种硬件路由器,目前由Linksys开发、维护。
        BEFVP41分别支持如下长度的Triple DES加密密钥(48个16进制字符)、MD5校验密钥(32个16进制字符)
        Encryption:
        80C4DAFD9AFC3D7AB57079E19DEBFFF43538A62039768D74
        Authentication:
        32EA72F58D7F1E063E14A3FF78131172
        但是由于设计上的错误,当用户试图手工输入这些密钥时,被错误地截断了,分别成为23个16进制字符、19个16进制字符
        Encryption:
        80C4DAFD9AFC3D7AB57079E
        Authentication:
        32EA72F58D7F1E063E1
        这导致最终使用了弱密钥,暴力穷举攻击成功的可能性加大。
        

- 公告与补丁

        临时解决方法:
        如果您不能立刻安装补丁或者升级,CNNVD建议您采取以下措施以降低威胁:
        * 暂时没有好的临时解决方法。
        厂商补丁:
        Linksys
        -------
        目前厂商还没有提供补丁或者升级程序,我们建议使用此软件的用户随时关注厂商的主页以获取最新版本:
        
        http://www.linksys.com/products/product.asp?prid=411&grid=23

- 漏洞信息

6739
Linksys EtherFast VPN Router Encryption Key Implementation Weakness

- 漏洞描述

Unknown or Incomplete

- 时间线

2002-03-07 Unknow
Unknow Unknow

- 解决方案

Unknown or Incomplete

- 相关参考

- 漏洞作者

Unknown or Incomplete

- 漏洞信息

Linksys BEFVP41 Key Truncation Encryption Weakening Vulnerability
Design Error 4250
Yes No
2002-03-08 12:00:00 2009-07-11 10:56:00
Vulnerability discovery credited to Phil Schlesinger <pschlesinger@teltechplus.com>.

- 受影响的程序版本

Linksys EtherFast BEFVP41 Router

- 漏洞讨论

The BEFVP41 is a hardware router implementation. It is distributed and maintained by Linksys.

Triple DES keying on the BEFVP41 supports a maximum of 48 hex character keys for encryption by specification. However, when a user attempts to manually enter a generated Triple DES key of any length greater than 23 bytes, the key is truncated to a maximum of 23 bytes.

This problem also exists in the MD5 authentication key, which by specification can be a maximum of 32 hex characters. Manual entry of the key results in a truncated key maximum length of 19 bytes.

This problem results in weakened encryption keys, and could increase the probability of successful brute force encryption attack and data recovery.

- 漏洞利用

Currently the SecurityFocus staff are not aware of any exploits for this issue. If you feel we are in error or are aware of more recent information, please mail us at: vuldb@securityfocus.com &lt;mailto:vuldb@securityfocus.com&gt;.

- 解决方案

An upgrade has been made available:


Linksys EtherFast BEFVP41 Router

- 相关参考

 

 

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