ghsa-26vr-8j45-3r4w
Vulnerability from github
Published
2021-04-06 17:31
Modified
2022-08-10 23:33
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
Jetty vulnerable to incorrect handling of invalid large TLS frame, exhausting CPU resources
Details

Impact

When using SSL/TLS with Jetty, either with HTTP/1.1, HTTP/2, or WebSocket, the server may receive an invalid large (greater than 17408) TLS frame that is incorrectly handled, causing CPU resources to eventually reach 100% usage.

Workarounds

The problem can be worked around by compiling the following class: ```java package org.eclipse.jetty.server.ssl.fix6072;

import java.nio.ByteBuffer; import javax.net.ssl.SSLEngine; import javax.net.ssl.SSLEngineResult; import javax.net.ssl.SSLException; import javax.net.ssl.SSLHandshakeException;

import org.eclipse.jetty.io.EndPoint; import org.eclipse.jetty.io.ssl.SslConnection; import org.eclipse.jetty.server.Connector; import org.eclipse.jetty.server.SslConnectionFactory; import org.eclipse.jetty.util.BufferUtil; import org.eclipse.jetty.util.annotation.Name; import org.eclipse.jetty.util.ssl.SslContextFactory;

public class SpaceCheckingSslConnectionFactory extends SslConnectionFactory { public SpaceCheckingSslConnectionFactory(@Name("sslContextFactory") SslContextFactory factory, @Name("next") String nextProtocol) { super(factory, nextProtocol); }

@Override
protected SslConnection newSslConnection(Connector connector, EndPoint endPoint, SSLEngine engine)
{
    return new SslConnection(connector.getByteBufferPool(), connector.getExecutor(), endPoint, engine, isDirectBuffersForEncryption(), isDirectBuffersForDecryption())
    {
        @Override
        protected SSLEngineResult unwrap(SSLEngine sslEngine, ByteBuffer input, ByteBuffer output) throws SSLException
        {
            SSLEngineResult results = super.unwrap(sslEngine, input, output);

            if ((results.getStatus() == SSLEngineResult.Status.BUFFER_UNDERFLOW ||
                results.getStatus() == SSLEngineResult.Status.OK && results.bytesConsumed() == 0 && results.bytesProduced() == 0) &&
                BufferUtil.space(input) == 0)
            {
                BufferUtil.clear(input);
                throw new SSLHandshakeException("Encrypted buffer max length exceeded");
            }
            return results;
        }
    };
}

} `` This class can be deployed by: + The resulting class file should be put into a jar file (eg sslfix6072.jar) + The jar file should be made available to the server. For a normal distribution this can be done by putting the file into ${jetty.base}/lib + Copy the file${jetty.home}/modules/ssl.modto${jetty.base}/modules+ Edit the${jetty.base}/modules/ssl.mod` file to have the following section:

[lib] lib/sslfix6072.jar

  • Copy the file ${jetty.home}/etc/jetty-https.xml and${jetty.home}/etc/jetty-http2.xml to ${jetty.base}/etc
  • Edit files ${jetty.base}/etc/jetty-https.xml and ${jetty.base}/etc/jetty-http2.xml, changing any reference of org.eclipse.jetty.server.SslConnectionFactory to org.eclipse.jetty.server.ssl.fix6072.SpaceCheckingSslConnectionFactory. For example: xml <Call name="addIfAbsentConnectionFactory"> <Arg> <New class="org.eclipse.jetty.server.ssl.fix6072.SpaceCheckingSslConnectionFactory"> <Arg name="next">http/1.1</Arg> <Arg name="sslContextFactory"><Ref refid="sslContextFactory"/></Arg> </New> </Arg> </Call>
  • Restart Jetty
Show details on source website

To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.eclipse.jetty:jetty-server"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "7.2.2"
            },
            {
              "fixed": "9.4.39"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.eclipse.jetty:jetty-server"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "10.0.0"
            },
            {
              "fixed": "10.0.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.eclipse.jetty:jetty-server"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "11.0.0"
            },
            {
              "fixed": "11.0.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2021-28165"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400",
      "CWE-551",
      "CWE-755"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2021-04-02T23:02:13Z",
    "nvd_published_at": "2021-04-01T15:15:00Z",
    "severity": "HIGH"
  },
  "details": "### Impact\nWhen using SSL/TLS with Jetty, either with HTTP/1.1, HTTP/2, or WebSocket, the server may receive an invalid large (greater than 17408) TLS frame that is incorrectly handled, causing CPU resources to eventually reach 100% usage.\n\n### Workarounds\n\nThe problem can be worked around by compiling the following class:\n```java\npackage org.eclipse.jetty.server.ssl.fix6072;\n\nimport java.nio.ByteBuffer;\nimport javax.net.ssl.SSLEngine;\nimport javax.net.ssl.SSLEngineResult;\nimport javax.net.ssl.SSLException;\nimport javax.net.ssl.SSLHandshakeException;\n\nimport org.eclipse.jetty.io.EndPoint;\nimport org.eclipse.jetty.io.ssl.SslConnection;\nimport org.eclipse.jetty.server.Connector;\nimport org.eclipse.jetty.server.SslConnectionFactory;\nimport org.eclipse.jetty.util.BufferUtil;\nimport org.eclipse.jetty.util.annotation.Name;\nimport org.eclipse.jetty.util.ssl.SslContextFactory;\n\npublic class SpaceCheckingSslConnectionFactory extends SslConnectionFactory\n{\n    public SpaceCheckingSslConnectionFactory(@Name(\"sslContextFactory\") SslContextFactory factory, @Name(\"next\") String nextProtocol)\n    {\n        super(factory, nextProtocol);\n    }\n\n    @Override\n    protected SslConnection newSslConnection(Connector connector, EndPoint endPoint, SSLEngine engine)\n    {\n        return new SslConnection(connector.getByteBufferPool(), connector.getExecutor(), endPoint, engine, isDirectBuffersForEncryption(), isDirectBuffersForDecryption())\n        {\n            @Override\n            protected SSLEngineResult unwrap(SSLEngine sslEngine, ByteBuffer input, ByteBuffer output) throws SSLException\n            {\n                SSLEngineResult results = super.unwrap(sslEngine, input, output);\n\n                if ((results.getStatus() == SSLEngineResult.Status.BUFFER_UNDERFLOW ||\n                    results.getStatus() == SSLEngineResult.Status.OK \u0026\u0026 results.bytesConsumed() == 0 \u0026\u0026 results.bytesProduced() == 0) \u0026\u0026\n                    BufferUtil.space(input) == 0)\n                {\n                    BufferUtil.clear(input);\n                    throw new SSLHandshakeException(\"Encrypted buffer max length exceeded\");\n                }\n                return results;\n            }\n        };\n    }\n}\n```\nThis class can be deployed by:\n + The resulting class file should be put into a jar file (eg sslfix6072.jar)\n + The jar file should be made available to the server. For a normal distribution this can be done by putting the file into ${jetty.base}/lib\n + Copy the file `${jetty.home}/modules/ssl.mod` to `${jetty.base}/modules`\n + Edit the `${jetty.base}/modules/ssl.mod` file to have the following section:\n\n```\n[lib]\nlib/sslfix6072.jar\n```\n\n+ Copy the file `${jetty.home}/etc/jetty-https.xml` and`${jetty.home}/etc/jetty-http2.xml` to `${jetty.base}/etc`\n+ Edit files `${jetty.base}/etc/jetty-https.xml` and `${jetty.base}/etc/jetty-http2.xml`, changing any reference of `org.eclipse.jetty.server.SslConnectionFactory` to `org.eclipse.jetty.server.ssl.fix6072.SpaceCheckingSslConnectionFactory`. For example:\n```xml\n  \u003cCall name=\"addIfAbsentConnectionFactory\"\u003e\n    \u003cArg\u003e\n      \u003cNew class=\"org.eclipse.jetty.server.ssl.fix6072.SpaceCheckingSslConnectionFactory\"\u003e\n        \u003cArg name=\"next\"\u003ehttp/1.1\u003c/Arg\u003e\n        \u003cArg name=\"sslContextFactory\"\u003e\u003cRef refid=\"sslContextFactory\"/\u003e\u003c/Arg\u003e\n      \u003c/New\u003e\n    \u003c/Arg\u003e\n  \u003c/Call\u003e\n```\n+ Restart Jetty",
  "id": "GHSA-26vr-8j45-3r4w",
  "modified": "2022-08-10T23:33:55Z",
  "published": "2021-04-06T17:31:30Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/eclipse/jetty.project/security/advisories/GHSA-26vr-8j45-3r4w"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-28165"
    },
    {
      "type": "WEB",
      "url": "https://www.oracle.com/security-alerts/cpuoct2021.html"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread.html/rc907ed7b089828364437de5ed57fa062330970dc1bc5cd214b711f77@%3Ccommits.zookeeper.apache.org%3E"
    },
    {
      "type": "WEB",
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    },
    {
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    },
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    {
      "type": "WEB",
      "url": "https://www.oracle.com/security-alerts/cpujan2022.html"
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      "url": "https://www.debian.org/security/2021/dsa-4949"
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      "url": "https://security.netapp.com/advisory/ntap-20210611-0006"
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      "url": "https://lists.apache.org/thread.html/rfd3ff6e66b6bbcfb2fefa9f5a20328937c0369b2e142e3e1c6774743@%3Creviews.spark.apache.org%3E"
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    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2021/04/20/3"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Jetty vulnerable to incorrect handling of invalid large TLS frame, exhausting CPU resources"
}


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