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地图 / Integer-underflow leads to heap over-read in TFTP implementation

Integer-underflow leads to heap over-read in TFTP implementation

内存破坏 / 缓冲区越界读 / #3508321

厂商
curl
严重程度
低危
赏金
—
弱点
缓冲区越界读
研究员
@z2_
披露日期
2026-01-14
资产
https://github.com/curl/curl
CVE
—

该报告还没有中文解读。

原文摘录

摘自原文(1675 字符中的一小部分)
libcurl on commit 3ee1d3b573e6ea36fb478dbd0d9913483b900928 contains a vulnerability in its TFTP implementation that can cause curl or a libcurl-user to send heap memory beyond the bounds of an allocated chunk to a malicious TFTP server.
原文中的代码
if(strlen(filename) > (state->blksize - strlen(mode) - 4)) {
  // [...]
}

curl_msnprintf((char *)state->spacket.data + 2,
                state->blksize,
                "%s%c%s%c", filename, '\0', mode, '\0');
sbytes = 4 + strlen(filename) + strlen(mode);

// [...]

senddata = …

默认不展示报告全文。以上为简短摘录,完整复现过程请阅读原文。版权归研究员与 curl 所有。

时间线

  • 报告提交
  • 公开披露
阅读 HackerOne 原文 ↗作者 @z2_ · 版权归作者与 curl 所有

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Integer-underflow leads to heap over-read in TFTP implementation · 破甲 POJIA