CVE-2022-45047: Sshd common Unsafe Deserialization Vulnerability

CRITICAL
Advisory Identifier: GHSA-fhw8-8j55-vwgq
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CVSS 9.8
CWE-502
Published
Advisory Summary

CVE-2022-45047 is a CRITICAL (CVSS 9.8) unsafe deserialization vulnerability (CWE-502: Deserialization of Untrusted Data) affecting Sshd common libraries in the Maven ecosystem. The issue involves unsafe deserialization in apache mina sshd. Remediation is available by upgrading affected packages to version 2.9.2.

CVE-2022-45047 at a Glance

CVE Identifier CVE-2022-45047
GHSA Identifier GHSA-fhw8-8j55-vwgq
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification CWE-502: Deserialization of Untrusted Data
Affected Product Sshd common
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 9.8

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity High (I:H)
Availability High (A:H)

How to Fix CVE-2022-45047

To remediate this vulnerability, upgrade all affected Sshd common dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

org.apache.sshd:sshd-common fixed: 2.9.2 
<dependency>
    <groupId>org.apache.sshd</groupId>
    <artifactId>sshd-common</artifactId>
    <version>2.9.2</version>
</dependency>
org.apache.sshd:sshd-core fixed: 2.9.2 
<dependency>
    <groupId>org.apache.sshd</groupId>
    <artifactId>sshd-core</artifactId>
    <version>2.9.2</version>
</dependency>
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

mvn dependency:tree -Dincludes=org.apache.sshd

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2022-45047, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree -Dincludes=org.apache.sshd

Analyze the terminal output to locate any version of Sshd common in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.9.2), your application is affected.

Note: The mvn dependency:tree -Dincludes=org.apache.sshd command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-502: Deserialization of Untrusted Data, where the product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid. In Sshd common, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

Class org.apache.sshd.server.keyprovider.SimpleGeneratorHostKeyProvider in Apache MINA SSHD <= 2.9.1 uses Java deserialization to load a serialized java.security.PrivateKey. The class is one of several implementations that an implementor using Apache MINA SSHD can choose for loading the host keys of an SSH server. Until version 2.1.0, the code affected by this vulnerability appeared in `org.apache.sshd:sshd-core`. Version 2.1.0 contains a [commit](https://github.com/apache/mina-sshd/commit/10de190e7d3f9189deb76b8d08c72334a1fe2df0) where the code was moved to the package `org.apache.sshd:sshd-common`, which did not exist until version 2.1.0.

CVE-2022-45047 Affected Sshd common Versions

2 component(s)
Fixed Versions:
2.9.2
Product / Package Ecosystem Affected Versions Fixed Version
org.apache.sshd:sshd-common
maven/org.apache.sshd/sshd-common
Maven
< 2.9.2
2.9.2
org.apache.sshd:sshd-core
maven/org.apache.sshd/sshd-core
Maven
< 2.9.2
2.9.2

References

NVD — CVE-2022-45047 NVD
https://nvd.nist.gov/vuln/detail/CVE-2022-45047
Security Fix Commit FIX COMMIT
https://github.com/apache/mina-sshd/commit/03238d51586f6b3c0bdbb1a23cf16799344d6c32
Security Fix Commit FIX COMMIT
https://github.com/apache/mina-sshd/commit/10de190e7d3f9189deb76b8d08c72334a1fe2df0
Security Fix Commit FIX COMMIT
https://github.com/apache/mina-sshd/commit/5a8fe830b2a2308a2b24ac8115a391af477f64f5
Sshd common Source Repository REPOSITORY
https://github.com/apache/mina-sshd
www.mail-archive.com/dev@mina.apache.org... WEB
https://www.mail-archive.com/dev@mina.apache.org/msg39312.html

Frequently Asked Questions

What is CVE-2022-45047?
CVE-2022-45047 is a security vulnerability in Sshd common involving Unsafe deserialization in Apache MINA SSHD under CWE-502: Deserialization of Untrusted Data.
Which Sshd common versions are affected?
Affected versions include releases prior to 2.9.2 across affected packages: org.apache.sshd:sshd-common, org.apache.sshd:sshd-core.
What version fixes CVE-2022-45047?
Upgrading to 2.9.2 (or the latest patched release for your respective branch) resolves the vulnerability.
Is sshd-common affected?
Yes, org.apache.sshd:sshd-common is affected in releases prior to 2.9.2. Upgrade your dependency to 2.9.2 or later.
Is sshd-core affected?
Yes, org.apache.sshd:sshd-core is affected in releases prior to 2.9.2. Upgrade your dependency to 2.9.2 or later.
What is the CVSS score of CVE-2022-45047?
CVE-2022-45047 has a CVSS v3.1 base score of 9.8 (CRITICAL) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2022-45047?
CVE-2022-45047 is classified under CWE-502: Deserialization of Untrusted Data (The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.).
How can I check Maven dependencies for CVE-2022-45047?
Run the dependency tree command: 'mvn dependency:tree -Dincludes=org.apache.sshd'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-fhw8-8j55-vwgq",
  "modified" : "2023-08-18T20:44:39Z",
  "published" : "2022-11-16T12:00:18Z",
  "aliases" : [ "CVE-2022-45047" ],
  "summary" : "Unsafe deserialization in Apache MINA SSHD",
  "details" : "Class org.apache.sshd.server.keyprovider.SimpleGeneratorHostKeyProvider in Apache MINA SSHD <= 2.9.1 uses Java deserialization to load a serialized java.security.PrivateKey. The class is one of several implementations that an implementor using Apache MINA SSHD can choose for loading the host keys of an SSH server.\n\nUntil version 2.1.0, the code affected by this vulnerability appeared in `org.apache.sshd:sshd-core`. Version 2.1.0 contains a [commit](https://github.com/apache/mina-sshd/commit/10de190e7d3f9189deb76b8d08c72334a1fe2df0) where the code was moved to the package `org.apache.sshd:sshd-common`, which did not exist until version 2.1.0.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.apache.sshd:sshd-common"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.9.2"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.apache.sshd:sshd-core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.9.2"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "< 2.1.0"
    }
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2022-45047"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/apache/mina-sshd/commit/03238d51586f6b3c0bdbb1a23cf16799344d6c32"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/apache/mina-sshd/commit/10de190e7d3f9189deb76b8d08c72334a1fe2df0"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/apache/mina-sshd/commit/5a8fe830b2a2308a2b24ac8115a391af477f64f5"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/apache/mina-sshd"
  }, {
    "type" : "WEB",
    "url" : "https://www.mail-archive.com/dev@mina.apache.org/msg39312.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-502" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-11-21T23:46:32Z",
    "nvd_published_at" : "2022-11-16T09:15:00Z"
  }
}