Add detection for CVE-2024-9487

agent/exploits/cve_2024_9487.py

@@ -0,0 +1,100 @@
+import datetime
+import re
+from urllib import parse as urlparse
+
+import requests
+from requests import exceptions as requests_exceptions
+from semver import Version
+
+from agent import definitions
+from agent import exploits_registry
+from agent.exploits import webexploit
+
+MAX_REDIRECTS = 2
+DEFAULT_TIMEOUT = datetime.timedelta(seconds=90)
+VULNERABILITY_TITLE = "GITHUB ENTERPRISE SERVER AUTHENTICATION BYPASS"
+VULNERABILITY_REFERENCE = "CVE-2024-9487"
+VULNERABILITY_DESCRIPTION = """A cryptographic signature verification flaw in GitHub Enterprise Server allowed bypassing SAML SSO authentication,
+leading to unauthorized user access. Exploitation required encrypted assertions, direct network access, and a signed SAML response or metadata.
+It affected versions before 3.15 and was fixed in 3.11.16, 3.12.10, 3.13.5, and 3.14.2. The vulnerability was reported through GitHub's Bug Bounty program."""
+RISK_RATING = "CRITICAL"
+
+VULNERABLE_RANGES = [
+    (None, "3.10.17"),
+    ("3.11.0", "3.11.5"),
+    ("3.12.0", "3.12.9"),
+    ("3.13.0", "3.13.4"),
+    ("3.14.0", "3.14.1"),
+]
+
+
+@exploits_registry.register
+class CVE20249487Exploit(webexploit.WebExploit):
+    accept_request = definitions.Request(method="GET", path="/")
+    check_request = definitions.Request(method="GET", path="/")
+    accept_pattern = [re.compile("GitHub\sEnterprise\sServer\s\d+\.\d+\.\d+")]
+    version_pattern = re.compile("GitHub\sEnterprise\sServer\s(\d+\.\d+\.\d+)")
+
+    metadata = definitions.VulnerabilityMetadata(
+        title=VULNERABILITY_TITLE,
+        description=VULNERABILITY_DESCRIPTION,
+        reference=VULNERABILITY_REFERENCE,
+        risk_rating=RISK_RATING,
+    )
+
+    def check(self, target: definitions.Target) -> list[definitions.Vulnerability]:
+        """Rule to detect specific vulnerability on a specific target.
+
+        Args:
+            target: Target to scan
+
+        Returns:
+            List of identified vulnerabilities.
+        """
+        session = requests.Session()
+        session.max_redirects = MAX_REDIRECTS
+        session.verify = False
+
+        vulnerabilities: list[definitions.Vulnerability] = []
+
+        target_endpoint = urlparse.urljoin(target.origin, self.check_request.path)
+
+        try:
+            req = requests.Request(
+                method=self.check_request.method,
+                url=target_endpoint,
+                data=self.check_request.data,
+            ).prepare()
+            resp = session.send(req, timeout=DEFAULT_TIMEOUT.seconds)
+        except requests_exceptions.RequestException:
+            return vulnerabilities
+
+        if (matched := self.version_pattern.findall(resp.text)) != []:
+            extracted_version = matched[0]
+
+            if _is_vulnerable(extracted_version) is True:
+                vulnerability = self._create_vulnerability(target)
+                vulnerabilities.append(vulnerability)
+
+        return vulnerabilities
+
+
+def _is_vulnerable(extracted_version: str) -> bool:
+    """Check if the extracted version is in the list of vulnerable ranges.
+
+    Args:
+        extracted_version: Version of GitHub Enterprise Server
+
+    Returns:
+        True if the version is vulnerable, False otherwise.
+    """
+    extracted_ver = Version.parse(extracted_version)
+
+    for min_version, max_version in VULNERABLE_RANGES:
+        min_ver = Version.parse(min_version) if min_version else None
+        max_ver = Version.parse(max_version)
+
+        if (min_ver is None or extracted_ver >= min_ver) and extracted_ver <= max_ver:
+            return True
+
+    return False

tests/exploits/cve_2024_9487_test.py

@@ -0,0 +1,85 @@
+"""Unit tests for Agent Asteroid: CVE_2024_9487"""
+
+import requests_mock as req_mock
+
+from agent import definitions
+from agent.exploits import cve_2024_9487
+
+
+def testCVE20249487_whenVulnerable_reportFinding(
+    requests_mock: req_mock.mocker.Mocker,
+) -> None:
+    """CVE_2024_9487 unit test: case when target is vulnerable."""
+    requests_mock.get(
+        "http://localhost:80/",
+        text="""
+        <div class="d-flex flex-justify-center py-2">
+        <span class="f6 color-fg-muted">GitHub Enterprise Server 3.14.1</span>
+        </div>
+        """,
+        status_code=200,
+    )
+    exploit_instance = cve_2024_9487.CVE20249487Exploit()
+    target = definitions.Target("http", "localhost", 80)
+
+    accept = exploit_instance.accept(target)
+    vulnerabilities = exploit_instance.check(target)
+
+    assert accept is True
+    vulnerability = vulnerabilities[0]
+    assert vulnerability.entry.title == "GITHUB ENTERPRISE SERVER AUTHENTICATION BYPASS"
+    assert vulnerability.technical_detail == (
+        "http://localhost:80 is vulnerable to CVE-2024-9487, "
+        "GITHUB ENTERPRISE SERVER AUTHENTICATION BYPASS"
+    )
+
+
+def testCVE20249487_whenNotVulnerable_reportNothing(
+    requests_mock: req_mock.mocker.Mocker,
+) -> None:
+    """CVE_2024_9487 unit test: case when target is not vulnerable."""
+    requests_mock.get(
+        "http://localhost:80/",
+        text="""
+         <div class="d-flex flex-justify-center py-2">
+        <span class="f6 color-fg-muted">GitHub Enterprise Server 3.14.2</span>
+        </div>
+        """,
+        status_code=200,
+    )
+    exploit_instance = cve_2024_9487.CVE20249487Exploit()
+    target = definitions.Target("http", "localhost", 80)
+
+    accept = exploit_instance.accept(target)
+    vulnerabilities = exploit_instance.check(target)
+
+    assert accept is True
+    assert len(vulnerabilities) == 0
+
+
+def testCVE20249487_whenVersionVeryOld_reportFinding(
+    requests_mock: req_mock.mocker.Mocker,
+) -> None:
+    """CVE_2024_9487 unit test: case when matched version is older that 3.11."""
+    requests_mock.get(
+        "http://localhost:80/",
+        text="""
+        <div class="d-flex flex-justify-center py-2">
+        <span class="f6 color-fg-muted">GitHub Enterprise Server 3.9.1</span>
+        </div>
+        """,
+        status_code=200,
+    )
+    exploit_instance = cve_2024_9487.CVE20249487Exploit()
+    target = definitions.Target("http", "localhost", 80)
+
+    accept = exploit_instance.accept(target)
+    vulnerabilities = exploit_instance.check(target)
+
+    assert accept is True
+    vulnerability = vulnerabilities[0]
+    assert vulnerability.entry.title == "GITHUB ENTERPRISE SERVER AUTHENTICATION BYPASS"
+    assert vulnerability.technical_detail == (
+        "http://localhost:80 is vulnerable to CVE-2024-9487, "
+        "GITHUB ENTERPRISE SERVER AUTHENTICATION BYPASS"
+    )