CVE-2026-19565— Apache::AppSamurai::Util ≤1.01 会话密钥预测漏洞
一分钟漏洞结论
影响对象
CVE-2026-19565
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
Apache::AppSamurai::Util（Perl 模块）1.01 及更早版本在 函数中，基于系统时钟和进程 ID 生成可预测的会话认证密钥。 函数执行五轮 SHA-256 哈希计算：每轮哈希的输入包括一个新鲜的 时间读数（格式化为六位小数）、当前累积的哈希摘要以及进程 ID。在每次登录时， 函数会以空的密钥源调用 ；而可选的 配置指令是唯一能进入其他分支的途径。最终生成的密钥长度为 64 个十六进制字符。 其中，第一次时间读取的微秒字段可能取一百万个值中的任意一个，后续的读取时间紧随其后（在微秒级范围内）
一、 漏洞 CVE-2026-19565 基础信息
漏洞信息
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Vulnerability Title
Apache::AppSamurai::Util versions through 1.01 for Perl generate predictable session authentication keys from the clock and process id in CreateSessionAuthKey
来源: CVE Program / CVE List V5
Vulnerability Description
Apache::AppSamurai::Util versions through 1.01 for Perl generate predictable session authentication keys from the clock and process id in CreateSessionAuthKey.
CreateSessionAuthKey runs five rounds of SHA-256, each over a fresh Time::HiRes reading formatted to six decimal places, the running digest, and the process id. CreateSession calls it with an empty key source on every login, and the optional Keysource directive is the only route to the other branch. The result is 64 hex characters. The microsecond field of the first reading takes one of a million values, the later readings follow it within microseconds, and the process id is drawn from a small range.
The key is returned to the browser as the session cookie, and is combined with the configured server key to compute the session id and to encrypt the stored session data. An attacker who knows the second in which a session was created and the process id of the worker that created it can enumerate candidate keys and recover the victim's cookie, bypassing authentication for the protected resources. Each candidate has to be tried against the server, which validates the cookie with a key the attacker does not hold.
来源: CVE Program / CVE List V5
CVSS Information
N/A
来源: CVE Program / CVE List V5
Vulnerability Type
从可观察状态的可预测
来源: CVE Program / CVE List V5
受影响产品
| 厂商 | 产品 | 影响版本 | CPE | 订阅 |
|---|---|---|---|---|
| - | - | 0 ~ 1.01 | - |
|
二、漏洞 CVE-2026-19565 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-19565 补丁与修复 (1)
IV. Related Vulnerabilities
V. Comments for CVE-2026-19565
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