CVE-2020-35894: Obstack Unaligned References Vulnerability

HIGH
Advisory Identifier: GHSA-85j6-f8j6-q26x
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CVSS 7.5
CWE-706
Published
Advisory Summary

CVE-2020-35894 is a HIGH (CVSS 7.5) unaligned references vulnerability (CWE-706: Use of Incorrectly-Resolved Name or Reference) affecting Obstack libraries in the crates.io ecosystem. The issue involves unaligned references in obstack. Remediation is available by upgrading affected packages to version 0.1.4.

CVE-2020-35894 at a Glance

CVE Identifier CVE-2020-35894
GHSA Identifier GHSA-85j6-f8j6-q26x
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-706: Use of Incorrectly-Resolved Name or Reference
Affected Product Obstack
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:H/A:N).

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 High (I:H)
Availability None (A:N)

How to Fix CVE-2020-35894

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

obstack fixed: 0.1.4 
Upgrade obstack to 0.1.4
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 obstack

How to Check if You Are Affected

To determine whether your application is affected by CVE-2020-35894, inspect your project dependencies for Obstack:

inspect dependencies for obstack

Analyze the terminal output to locate any version of Obstack in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.1.4), 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-706: Use of Incorrectly-Resolved Name or Reference, where the product uses a name or reference to access a resource, but the name/reference resolves to a resource that is outside of the intended control sphere. In Obstack, 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

Obstack generates unaligned references for types that require a large alignment.

CVE-2020-35894 Affected Obstack Versions

1 component(s)
Fixed Versions:
0.1.4
Product / Package Ecosystem Affected Versions Fixed Version
obstack
 crates.io
< 0.1.4
0.1.4

References

NVD — CVE-2020-35894 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-35894
Obstack Source Repository REPOSITORY
https://github.com/petertodd/rust-obstack/issues/4
Obstack Source Repository REPOSITORY
https://github.com/petertodd/rust-obstack
rustsec.org/advisories/rustsec-... WEB
https://rustsec.org/advisories/RUSTSEC-2020-0040.html

Frequently Asked Questions

What is CVE-2020-35894?
CVE-2020-35894 is a security vulnerability in Obstack involving Unaligned references in Obstack under CWE-706: Use of Incorrectly-Resolved Name or Reference.
Which Obstack versions are affected?
Affected versions include releases prior to 0.1.4 across affected packages: obstack.
What version fixes CVE-2020-35894?
Upgrading to 0.1.4 (or the latest patched release for your respective branch) resolves the vulnerability.
Is obstack affected?
Yes, obstack is affected in releases prior to 0.1.4. Upgrade your dependency to 0.1.4 or later.
What is the CVSS score of CVE-2020-35894?
CVE-2020-35894 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:H/A:N.
What CWE is associated with CVE-2020-35894?
CVE-2020-35894 is classified under CWE-706: Use of Incorrectly-Resolved Name or Reference (The product uses a name or reference to access a resource, but the name/reference resolves to a resource that is outside of the intended control sphere.).
How can I check crates.io dependencies for CVE-2020-35894?
Run the dependency tree command: 'inspect dependencies for obstack'. 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-85j6-f8j6-q26x",
  "modified" : "2023-06-13T19:59:50Z",
  "published" : "2021-08-25T20:48:12Z",
  "aliases" : [ "CVE-2020-35894" ],
  "summary" : "Unaligned references in Obstack",
  "details" : "Obstack generates unaligned references for types that require a large alignment.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "crates.io",
      "name" : "obstack"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.1.4"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-35894"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/petertodd/rust-obstack/issues/4"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/petertodd/rust-obstack"
  }, {
    "type" : "WEB",
    "url" : "https://rustsec.org/advisories/RUSTSEC-2020-0040.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-706" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-08-19T21:06:51Z",
    "nvd_published_at" : null
  }
}