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地图 / Denial of Service (DoS) vulnerability in dedotdotify() URL path normalization

Denial of Service (DoS) vulnerability in dedotdotify() URL path normalization

拒绝服务 / 资源消耗失控 / #3463608

厂商
curl
严重程度
中危
赏金
—
弱点
资源消耗失控
研究员
@sy2n0
披露日期
2025-12-13
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(7473 字符中的一小部分)
A Denial of Service (DoS) vulnerability exists in the `dedotdotify()` function in `lib/urlapi.c` that can cause excessive CPU consumption due to O(n²) time complexity when processing URLs with malicious path patterns containing many `../` sequences.
原文中的代码
else if(is_dot(&p, &blen) && (ISSLASH(*p) || !blen)) {
  /* remove the last segment from the output buffer */
  size_t len = curlx_dyn_len(&out);
  if(len) {
    char *ptr = curlx_dyn_ptr(&out);
    char *last = memrchr(ptr, '/', len);  // O(n) operation
    if(last)
      curlx_dyn_setlen(&out, …

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 @sy2n0 · 版权归作者与 curl 所有

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