安全研究
CVE-2023-51766 SMTP Smuggling:Exim 端点序列解释的边界
Thinking
2024-02-15
3 分钟阅读
研究档案
#漏洞分析#代码审计#网络攻击
Exim 4.97.1 之前版本对 end-of-data 序列的判定完全交给 SMTP 客户端携带的字节决定——这等于把『DATA 结束』的判断责任外包给了对端的实现，攻击者只要让出站服务器放行 <LF>.<CR><LF>、入站服务器把它认作结束符，就能把任意 SMTP 命令偷渡进会话。
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