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CVE-2025-68113— ALTCHA 数据伪造问题漏洞

一分钟漏洞结论

影响对象
altcha-org altcha-lib
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。

ALTCHA是ALTCHA开源的一个自托管验证码软件。 ALTCHA存在数据伪造问题漏洞,该漏洞源于HMAC签名未明确绑定挑战参数,可能导致重放攻击。

CVSS 6.5 · Medium EPSS 0.46% · P38

可能的 ATT&CK 技术 1 AI

T1041 · Exfiltration Over C2 Channel
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一、 漏洞 CVE-2025-68113 基础信息

漏洞信息

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Vulnerability Title
ALTCHA Proof-of-Work Vulnerable to Challenge Splicing and Replay
来源: CVE Program / CVE List V5
Vulnerability Description
ALTCHA is privacy-first software for captcha and bot protection. A cryptographic semantic binding flaw in ALTCHA libraries allows challenge payload splicing, which may enable replay attacks. The HMAC signature does not unambiguously bind challenge parameters to the nonce, allowing an attacker to reinterpret a valid proof-of-work submission with a modified expiration value. This may allow previously solved challenges to be reused beyond their intended lifetime, depending on server-side replay handling and deployment assumptions. The vulnerability primarily impacts abuse-prevention mechanisms such as rate limiting and bot mitigation. It does not directly affect data confidentiality or integrity. This issue has been addressed by enforcing explicit semantic separation between challenge parameters and the nonce during HMAC computation. Users are advised to upgrade to patched versions, which include version 1.0.0 of the altcha Golang package, version 1.0.0 of the altcha Rubygem, version 1.0.0 of the altcha pip package, version 1.0.0 of the altcha Erlang package, version 1.4.1 of the altcha-lib npm package, version 1.3.1 of the altcha-org/altcha Composer package, and version 1.3.0 of the org.altcha:altcha Maven package. As a mitigation, implementations may append a delimiter to the end of the `salt` value prior to HMAC computation (for example, `<salt>?expires=<time>&`). This prevents ambiguity between parameters and the nonce and is backward-compatible with existing implementations, as the delimiter is treated as a standard URL parameter separator.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
来源: CVE Program / CVE List V5
Vulnerability Type
输入的错误解释
来源: CVE Program / CVE List V5
Vulnerability Title
ALTCHA 数据伪造问题漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
ALTCHA是ALTCHA开源的一个自托管验证码软件。 ALTCHA存在数据伪造问题漏洞,该漏洞源于HMAC签名未明确绑定挑战参数,可能导致重放攻击。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD

受影响产品

厂商 产品 影响版本 CPE 订阅
altcha-org altcha-lib < 1.4.1 -

二、漏洞 CVE-2025-68113 的公开POC

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三、漏洞 CVE-2025-68113 的情报信息

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CVE-2025-68113 补丁与修复 (6)

CVE-2025-68113 厂商安全公告 (1)

CVE-2025-68113 其他参考 (3)

IV. Related Vulnerabilities

V. Comments for CVE-2025-68113

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