9.7 KiB
9.7 KiB
title, system_id, category, advisory_mode, published_date, updated_date, severity, exploit_status, source_confidence, verification_status, verification_mode, artifact_mode, last_run_id, target_types, allow_public_validation, authorization_prerequisite, minimal_validation, aliases, affected_versions, fixed_versions, entity_refs, secure_code_topics, primary_source
| title | system_id | category | advisory_mode | published_date | updated_date | severity | exploit_status | source_confidence | verification_status | verification_mode | artifact_mode | last_run_id | target_types | allow_public_validation | authorization_prerequisite | minimal_validation | aliases | affected_versions | fixed_versions | entity_refs | secure_code_topics | primary_source | |||||||||||||||||||||||||||||||||||||||||
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| Prevent user enumeration using Guard or the new Authenticator-based Security | symfony | frameworks | core | 2021-05-13T20:23:02Z | 2026-03-13T22:16:14.858636Z | low | unknown | official | triage-manual | synthetic | synthetic |
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yes, with ownership or explicit authorization | asset ownership proof or explicit written authorization | read-only probe, controlled payload, reversible test |
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https://github.com/symfony/symfony/security/advisories/GHSA-5pv8-ppvj-4h68 |
Prevent user enumeration using Guard or the new Authenticator-based Security
本地实证状态
- 实证状态:
triage-manual - 实证方式:
synthetic - Artifact 模式:
synthetic - 最近运行:
- - 浏览器证据:
missing - Run Bundle:
-
事件层
- Canonical ID:
symfony--CVE-2021-21424 - 系统:
symfony - 严重度:
low - 来源置信度:
official - 官方主源: https://github.com/symfony/symfony/security/advisories/GHSA-5pv8-ppvj-4h68
- 影响版本:
v2.8.0, v2.8.1, v2.8.10, v2.8.11, v2.8.12, v2.8.13, v2.8.14, v2.8.15, v2.8.16, v2.8.17 - 修复版本:
5.2.8, 3.4.48, 4.4.23, 2.10.7, 2.11.3, 1.29.2, 1.31.1, 3.4.49, 4.4.24, 5.2.9
对象与版本映射
- Advisory Scope:
package - 影响对象:
symfony / symfony - Entity Refs:
symfony, symfony--package--symfony-symfony - 版本置信度:
high - 版本缺口:
- - 版本证据源:
https://github.com/symfony/symfony/security/advisories/GHSA-5pv8-ppvj-4h68, https://nvd.nist.gov/vuln/detail/CVE-2021-21424, https://github.com/symfony/symfony/commit/2a581d22cc621b33d5464ed65c4bc2057f72f011, https://symfony.com/cve-2021-21424, https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VRUS2H2SSOQWNLBD35SKIWIDQEMV2PD3
受控验证流程
- Workflow ID:
symfony--CVE-2021-21424--workflow - 漏洞家族:
xss - 入口面:
web-ui-render-path - 需要角色:
editor-or-admin - 触发向量: 对
xss家族入口投递最小化、可审计、可回滚的受控输入，比较修复前后差异。 - 请求/页面入口:
/admin/editor, /preview, /rendered-content - 输入形态: 受控 HTML/Markdown/富文本输入，观察渲染上下文是否失去编码或净化。
- 预期不安全行为: 输入在目标上下文执行或被浏览器解释为主动内容。
其他来源
- https://nvd.nist.gov/vuln/detail/CVE-2021-21424
2a581d22cc- https://symfony.com/cve-2021-21424
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VRUS2H2SSOQWNLBD35SKIWIDQEMV2PD3
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UC7BND775DVZDQT3RMGD2HVB2PKLJDJW
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RH7TMM5CHQYBFFGXWRPJDPB3SKCZXI2M
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/KENRNLB3FYXYGDWRBH2PDBOZZKOD7VY4
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VRUS2H2SSOQWNLBD35SKIWIDQEMV2PD3
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UC7BND775DVZDQT3RMGD2HVB2PKLJDJW
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RH7TMM5CHQYBFFGXWRPJDPB3SKCZXI2M
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KENRNLB3FYXYGDWRBH2PDBOZZKOD7VY4
- https://lists.debian.org/debian-lts-announce/2023/07/msg00014.html
- https://github.com/symfony/symfony
- https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2021-21424.yaml
- https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/security/CVE-2021-21424.yaml
- https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/security-http/CVE-2021-21424.yaml
- https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/security-guard/CVE-2021-21424.yaml
- https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/maker-bundle/CVE-2021-21424.yaml
- https://github.com/FriendsOfPHP/security-advisories/blob/master/lexik/jwt-authentication-bundle/CVE-2021-21424.yaml
证据点与补丁验证
服务端证据点
- 应用日志中的命中路径、鉴权决策和异常栈
- 反向代理或边界层日志中的请求头、来源 IP 与路由决策
浏览器证据点
- 基线截图与攻击后截图的 DOM/视觉差异
- console、network 与 response metadata 中的异常信号
数据库/文件系统证据点
- 数据库中新增/越权读取的测试数据
- 文件系统中新增上传样本、缓存条目或越权读取痕迹
检测信号
- WAF / reverse proxy 异常日志、访问日志和告警
- 应用审计日志中的权限错误、重定向异常、模板渲染或上传落盘事件
补丁验证步骤
- 确认目标版本从
v2.8.0, v2.8.1, v2.8.10升级或回移到5.2.8。 - 保留同一组受控输入，在修复前后分别执行并比对响应、日志与浏览器证据。
- 确认修复后仅保留预期业务行为，不再触发越权、回显、异常渲染或错误请求。
- 补充
xss族自动化回归，避免同类路径在插件、主题或代理链中回归。
实验安全备注
- 只使用回环地址、哨兵目标、无害样本或可回滚测试数据。
- 禁止造成持久破坏、越权下载真实数据或不可回滚 side effect。
- 如需浏览器证据，保留 baseline / proof 两份快照以及 console / network 记录。
实验层
- 仅用于自有资产、测试环境或已明确授权目标。
- 允许公网可达目标，但必须满足资产归属或明确授权前提。
- 最小化验证方式: 最小化验证、只读探测、可审计回显、受控注入。
- 若该案例涉及插件、模块或扩展，应同时检查供应链与升级策略。
- 禁止场景: 无归属证明或无明确授权的公网目标；知名公共网站或与测试无关的第三方资产；会造成持久破坏、数据越权下载或不可回滚影响的动作
修复示例
- javascript-typescript:xss-output-encoding
- nodejs:xss-output-encoding
- java:xss-output-encoding
- php:xss-output-encoding
- python:xss-output-encoding
- ruby:xss-output-encoding
- csharp:xss-output-encoding
- go:xss-output-encoding
- javascript-typescript:authz-server-side-recheck
- nodejs:authz-server-side-recheck
- java:authz-server-side-recheck
- php:authz-server-side-recheck
- python:authz-server-side-recheck
- ruby:authz-server-side-recheck
- csharp:authz-server-side-recheck
- go:authz-server-side-recheck
- javascript-typescript:path-traversal-guard
- nodejs:path-traversal-guard
- java:path-traversal-guard
- php:path-traversal-guard
- python:path-traversal-guard
- ruby:path-traversal-guard
- csharp:path-traversal-guard
- go:path-traversal-guard