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vulnerability

概述:

我在使用springboot1版本进行二次开发,最后测试时发现本项目以及springboot1版本的项目存在两个比较严重的漏洞,分别是任意文件上传shiro权限绕过

问题:

1.任意文件上传

http://domain/admin/sys/user/avatar.html(漏洞页面,即头像上传处)
url:http://domain/file/upload

原因:
漏洞在文件SysFileController.java中52-100行,头像上传功能处。代码中只对上传的头像判空,并未做任何校验。只需要将webshell写入图片然后抓包修改后缀即可上传成功,点击提交修改的时候暴露了上传地址,直接访问即可getshell。

效果:
b55bf715d9b0c2babf6e7e13abd2d71

c661c665ddd1b5f700d457221098716

getshell

2.shiro权限绕过

payload:http://domain/;/需要授权页面路径

原因:
利用了spring控制器和shiro的路由处理方式不同,当这两个一起使用时,url先进入shiro鉴权,分号起到截断作用,"/;/admin/index.html"变成"/",从而绕过shiro。在spring中,分号路由默认会被去掉,"/;/admin/index.html"当成"/admin/index.html"解析,然后匹配相应路由。详细请参考漏洞编号cve-2020-11989

效果:
shiro1

shiro2

解决方案:

1.文件上传漏洞

在代码中增加上传校验步骤,并将上传路径加密传输。例如:

/**
* 文件校验
*/
private int verifyForm(MultipartFile file){
        // 大小: 0<file<1M
        if (file == null || file.getSize() > 1048576){
            return 0;
        }
        // 文件后缀: .png/.jpg/.jpeg
        fileName = file.getOriginalFilename();
        if (!fileName.contains(".") &&
                !fileName.substring(fileName.lastIndexOf(".") + 1).equals("png") &&
                !fileName.substring(fileName.lastIndexOf(".") + 1).equals("jpg") &&
                !fileName.substring(fileName.lastIndexOf(".") + 1).equals("jpeg")){
            return 0;
        }
        // 文件头: ffd8ff=jpg/jpeg,89504e47=png
        if (!getFile(file).toLowerCase().startsWith("ffd8ff") &&
                !getFile(file).toLowerCase().startsWith("89504e47")){
            return 0;
        }
        // 文件名字是否包含sql注入特征:
        if (Pattern.matches("[()<>/';\"@#!$%^`-]*", fileName)){
            return 0;
        }
        // 文件内容是否为图片
        if (FileTypeHelp.getImageFileType((File) file) == null ||
                !FileTypeHelp.getImageFileType((File) file).equals("PNG") ||
                !FileTypeHelp.getImageFileType((File) file).equals("JPG") ||
                !FileTypeHelp.getImageFileType((File) file).equals("JPEG")){
            return 0;
        }
        return 1;
    }

public R upload(...){
...
// 上传路径加密传输: AES->Base64
        fileContextPath = fileContextPath.replace("/", "+");
        byte[] encrypt = AESUtil.encrypt(fileContextPath.getBytes(StandardCharsets.UTF_8), AESKEY);
        return R.ok().put("filePath", Base64.getEncoder().encodeToString(encrypt));
}

public R updateAvatar(...){
// 解密头像上传地址: Base64->AES
        byte[] decryptd = AESUtil.decrypt(
                Base64.getDecoder().decode(avatarUrl), AESKEY);
        currentUser.setAvatarUrl(new String(decryptd).replace("+", "/"));
        int updateAvatar = sysUserService.updateAvatar(currentUser);
...
}

2.shiro权限绕过

将依赖版本升级至 1.7.1

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