CVE-2022-27772: Spring Framework Spring-boot Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-cm59-pr5q-cw85",
  "modified" : "2022-07-11T20:59:02Z",
  "published" : "2022-07-11T20:59:02Z",
  "aliases" : [ "CVE-2022-27772" ],
  "summary" : "Temporary Directory Hijacking to Local Privilege Escalation Vulnerability in org.springframework.boot:spring-boot",
  "details" : "spring-boot versions prior to version `v2.2.11.RELEASE` was vulnerable to temporary directory hijacking. This vulnerability impacted the `org.springframework.boot.web.server.AbstractConfigurableWebServerFactory.createTempDir` method.\n\nThe vulnerable method is used to create a work directory for embedded web servers such as Tomcat and Jetty. The directory contains configuration files, JSP/class files, etc. If a local attacker got the permission to write in this directory, they could completely take over the application (ie. local privilege escalation).\n\n#### Impact Location\n\nThis vulnerability impacted the following source location:\n\n```java\n\t/**\n\t * Return the absolute temp dir for given web server.\n\t * @param prefix server name\n\t * @return the temp dir for given server.\n\t */\n\tprotected final File createTempDir(String prefix) {\n\t\ttry {\n\t\t\tFile tempDir = File.createTempFile(prefix + \".\", \".\" + getPort());\n\t\t\ttempDir.delete();\n\t\t\ttempDir.mkdir();\n\t\t\ttempDir.deleteOnExit();\n\t\t\treturn tempDir;\n\t\t}\n```\n\\- https://github.com/spring-projects/spring-boot/blob/ce70e7d768977242a8ea6f93188388f273be5851/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/web/server/AbstractConfigurableWebServerFactory.java#L165-L177\n\nThis vulnerability exists because `File.mkdir` returns `false` when it fails to create a directory, it does not throw an exception. As such, the following race condition exists:\n\n```java\nFile tmpDir =File.createTempFile(prefix + \".\", \".\" + getPort()); // Attacker knows the full path of the file that will be generated\n// delete the file that was created\ntmpDir.delete(); // Attacker sees file is deleted and begins a race to create their own directory before Jetty.\n// and make a directory of the same name\n// SECURITY VULNERABILITY: Race Condition! - Attacker beats java code and now owns this directory\ntmpDir.mkdirs(); // This method returns 'false' because it was unable to create the directory. No exception is thrown.\n// Attacker can write any new files to this directory that they wish.\n// Attacker can read any files created by this process.\n```\n\n### Prerequisites\n\nThis vulnerability impacts Unix-like systems, and very old versions of Mac OSX and Windows as they all share the system temporary directory between all users.\n\n### Patches\n\nThis vulnerability was inadvertently fixed as a part of this patch: https://github.com/spring-projects/spring-boot/commit/667ccdae84822072f9ea1a27ed5c77964c71002d\n\nThis vulnerability is patched in versions `v2.2.11.RELEASE` or later.\n\n### Workarounds\n\nSetting the `java.io.tmpdir` system environment variable to a directory that is exclusively owned by the executing user will fix this vulnerability for all operating systems.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.springframework.boot:spring-boot"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.2.11.RELEASE"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 2.2.10.RELEASE"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/JLLeitschuh/security-research/security/advisories/GHSA-cm59-pr5q-cw85"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2022-27772"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/spring-projects/spring-boot/commit/667ccdae84822072f9ea1a27ed5c77964c71002d"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/spring-projects/spring-boot"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-377", "CWE-379", "CWE-668" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-07-11T20:59:02Z",
    "nvd_published_at" : "2022-03-30T18:15:00Z"
  }
}