CVE-2023-40021— Oppia 安全漏洞
一分钟漏洞结论
影响对象
oppia oppia
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。
Oppia是一种在线学习工具。用于轻松创建和共享交互式活动。 Oppia 1.1.0 到 3.3.2版本存在安全漏洞，该漏洞源于当将收到的 CSRF 令牌与预期令牌进行比较时，使用字符串相等运算符 ==，攻击者利用该漏洞可以通过重复提交无效令牌，逐个字符地暴力破解预期的 CSRF 令牌。
可能的 ATT&CK 技术 1 AI
T1557 · Adversary-in-the-Middle
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一、 漏洞 CVE-2023-40021 基础信息
漏洞信息
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Vulnerability Title
Timing Attack Reveals CSRF Tokens in oppia
来源: CVE Program / CVE List V5
Vulnerability Description
Oppia is an online learning platform. When comparing a received CSRF token against the expected token, Oppia uses the string equality operator (`==`), which is not safe against timing attacks. By repeatedly submitting invalid tokens, an attacker can brute-force the expected CSRF token character by character. Once they have recovered the token, they can then submit a forged request on behalf of a logged-in user and execute privileged actions on that user's behalf. In particular the function to validate received CSRF tokens is at `oppia.core.controllers.base.CsrfTokenManager.is_csrf_token_valid`. An attacker who can lure a logged-in Oppia user to a malicious website can perform any change on Oppia that the user is authorized to do, including changing profile information; creating, deleting, and changing explorations; etc. Note that the attacker cannot change a user's login credentials. An attack would need to complete within 1 second because every second, the time used in computing the token changes. This issue has been addressed in commit `b89bf80837` which has been included in release `3.3.2-hotfix-2`. Users are advised to upgrade. There are no known workarounds for this vulnerability.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N
来源: CVE Program / CVE List V5
Vulnerability Type
通过差异性导致的信息暴露
来源: CVE Program / CVE List V5
Vulnerability Title
Oppia 安全漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
Oppia是一种在线学习工具。用于轻松创建和共享交互式活动。 Oppia 1.1.0 到 3.3.2版本存在安全漏洞，该漏洞源于当将收到的 CSRF 令牌与预期令牌进行比较时，使用字符串相等运算符 ==，攻击者利用该漏洞可以通过重复提交无效令牌，逐个字符地暴力破解预期的 CSRF 令牌。
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
二、漏洞 CVE-2023-40021 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2023-40021 补丁与修复 (2)
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https://github.com/oppia/oppia/pull/18769 x_refsource_MISC
CVE-2023-40021 厂商安全公告 (1)
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https://github.com/oppia/oppia/security/advisories/GHSA-49jp-pjc3-2532 x_refsource_CONFIRM
CVE-2023-40021 其他参考 (1)
IV. Related Vulnerabilities
V. Comments for CVE-2023-40021
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