CVE-2020-35857: Trust dns server Stack Consumption Vulnerability

HIGH
Advisory Identifier: GHSA-4cww-f7w5-x525
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CVSS 7.5
CWE-400
Published
Advisory Summary

CVE-2020-35857 is a HIGH (CVSS 7.5) stack consumption vulnerability (CWE-400: Uncontrolled Resource Consumption) affecting Trust dns server libraries in the crates.io ecosystem. The issue involves stack consumption in trust-dns-server. Remediation is available by upgrading affected packages to version 0.18.1.

CVE-2020-35857 at a Glance

CVE Identifier CVE-2020-35857
GHSA Identifier GHSA-4cww-f7w5-x525
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-400: Uncontrolled Resource Consumption
Affected Product Trust dns server
Package Ecosystem crates.io
Published Date
Last Updated

Security Impact

CVSS: 7.5

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:N/I:N/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 None (C:N)
Integrity None (I:N)
Availability High (A:H)

How to Fix CVE-2020-35857

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

trust-dns-server fixed: 0.18.1 
Upgrade trust-dns-server to 0.18.1
Verify Direct and Transitive Dependencies

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

inspect dependencies for trust-dns-server

How to Check if You Are Affected

To determine whether your application is affected by CVE-2020-35857, inspect your project dependencies for Trust dns server:

inspect dependencies for trust-dns-server

Analyze the terminal output to locate any version of Trust dns server in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.18.1), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-400: Uncontrolled Resource Consumption, where the product does not properly control the allocation and maintenance of a limited resource. In Trust dns server, 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

There's a stack overflow leading to a crash and potential DOS when processing additional records for return of MX or SRV record types from the server. This is only possible when a zone is configured with a null target for MX or SRV records. Prior to 0.16.0 the additional record processing was not supported by trust-dns-server. There Are no known issues with upgrading from 0.16 or 0.17 to 0.18.1. The remidy should be to upgrade to 0.18.1. If unable to do so, MX, SRV or other record types with a target to the null type, should be avoided.

CVE-2020-35857 Affected Trust dns server Versions

1 component(s)
Fixed Versions:
0.18.1
Product / Package Ecosystem Affected Versions Fixed Version
trust-dns-server
 crates.io
≥ 0.16.0
< 0.18.1
0.18.1

References

NVD — CVE-2020-35857 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-35857
Trust dns server Source Repository REPOSITORY
https://github.com/bluejekyll/trust-dns/issues/980
Trust dns server Source Repository REPOSITORY
https://github.com/bluejekyll/trust-dns/pull/982
Security Fix Commit FIX COMMIT
https://github.com/bluejekyll/trust-dns/commit/8b9eab05795fdc098976262853b2498055c7a8f3
Trust dns server Source Repository REPOSITORY
https://github.com/bluejekyll/trust-dns
rustsec.org/advisories/rustsec-... WEB
https://rustsec.org/advisories/RUSTSEC-2020-0001.html

Frequently Asked Questions

What is CVE-2020-35857?
CVE-2020-35857 is a security vulnerability in Trust dns server involving Stack consumption in trust-dns-server under CWE-400: Uncontrolled Resource Consumption.
Which Trust dns server versions are affected?
Affected versions include releases prior to 0.18.1 across affected packages: trust-dns-server.
What version fixes CVE-2020-35857?
Upgrading to 0.18.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is trust-dns-server affected?
Yes, trust-dns-server is affected in releases prior to 0.18.1. Upgrade your dependency to 0.18.1 or later.
What is the CVSS score of CVE-2020-35857?
CVE-2020-35857 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2020-35857?
CVE-2020-35857 is classified under CWE-400: Uncontrolled Resource Consumption (The product does not properly control the allocation and maintenance of a limited resource.).
How can I check crates.io dependencies for CVE-2020-35857?
Run the dependency tree command: 'inspect dependencies for trust-dns-server'. 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-4cww-f7w5-x525",
  "modified" : "2023-12-08T19:31:23Z",
  "published" : "2021-08-25T20:46:13Z",
  "aliases" : [ "CVE-2020-35857" ],
  "summary" : "Stack consumption in trust-dns-server",
  "details" : "There's a stack overflow leading to a crash and potential DOS when processing additional records for return of MX or SRV record types from the server. This is only possible when a zone is configured with a null target for MX or SRV records. Prior to 0.16.0 the additional record processing was not supported by trust-dns-server. There Are no known issues with upgrading from 0.16 or 0.17 to 0.18.1. The remidy should be to upgrade to 0.18.1. If unable to do so, MX, SRV or other record types with a target to the null type, should be avoided.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "crates.io",
      "name" : "trust-dns-server"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0.16.0"
      }, {
        "fixed" : "0.18.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-35857"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/bluejekyll/trust-dns/issues/980"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/bluejekyll/trust-dns/pull/982"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/bluejekyll/trust-dns/commit/8b9eab05795fdc098976262853b2498055c7a8f3"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/bluejekyll/trust-dns"
  }, {
    "type" : "WEB",
    "url" : "https://rustsec.org/advisories/RUSTSEC-2020-0001.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-400" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-08-19T21:20:03Z",
    "nvd_published_at" : "2020-12-31T10:15:14Z"
  }
}