CVE-2021-36376: Git delta Path Traversal Vulnerability

HIGH
Advisory Identifier: GHSA-5xg3-j2j6-rcx4
Share
CVSS 7.8
CWE-23 CWE-427
Published
Advisory Summary

CVE-2021-36376 is a HIGH (CVSS 7.8) path traversal vulnerability (CWE-23: Relative Path Traversal) affecting Git delta libraries in the crates.io ecosystem. The issue involves relative path traversal in git-delta. Remediation is available by upgrading affected packages to version 0.8.3.

CVE-2021-36376 at a Glance

CVE Identifier CVE-2021-36376
GHSA Identifier GHSA-5xg3-j2j6-rcx4
Severity HIGH
CVSS v3.1 Base Score 7.8
CWE Classification CWE-23: Relative Path Traversal
Affected Product Git delta
Package Ecosystem crates.io
Published Date
Last Updated

Security Impact

CVSS: 7.8

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

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

How to Fix CVE-2021-36376

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

git-delta fixed: 0.8.3 
Upgrade git-delta to 0.8.3
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 git-delta

How to Check if You Are Affected

To determine whether your application is affected by CVE-2021-36376, inspect your project dependencies for Git delta:

inspect dependencies for git-delta

Analyze the terminal output to locate any version of Git delta in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.8.3), 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-23: Relative Path Traversal, where the product uses external input to construct a pathname that should be within a restricted directory, but it does not properly neutralize sequences such as ".." that can resolve to a location that is outside of that directory. In Git delta, 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

git-delta before 0.8.3 on Windows resolves an executable's pathname as a relative path from the current directory.

CVE-2021-36376 Affected Git delta Versions

1 component(s)
Fixed Versions:
0.8.3
Product / Package Ecosystem Affected Versions Fixed Version
git-delta
 crates.io
< 0.8.3
0.8.3

References

NVD — CVE-2021-36376 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-36376
Security Fix Commit FIX COMMIT
https://github.com/dandavison/delta/commit/f01846bd443aaf92fdd5ac20f461beac3f6ee3fd
Git delta Source Repository REPOSITORY
https://github.com/dandavison/delta
Git delta Release RELEASE
https://github.com/dandavison/delta/releases/tag/0.8.3
rustsec.org/advisories/rustsec-... WEB
https://rustsec.org/advisories/RUSTSEC-2021-0105.html
vuln.ryotak.me/advisories/54 WEB
https://vuln.ryotak.me/advisories/54

Frequently Asked Questions

What is CVE-2021-36376?
CVE-2021-36376 is a security vulnerability in Git delta involving Relative Path Traversal in git-delta under CWE-23: Relative Path Traversal.
Which Git delta versions are affected?
Affected versions include releases prior to 0.8.3 across affected packages: git-delta.
What version fixes CVE-2021-36376?
Upgrading to 0.8.3 (or the latest patched release for your respective branch) resolves the vulnerability.
Is git-delta affected?
Yes, git-delta is affected in releases prior to 0.8.3. Upgrade your dependency to 0.8.3 or later.
What is the CVSS score of CVE-2021-36376?
CVE-2021-36376 has a CVSS v3.1 base score of 7.8 (HIGH) with vector string CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2021-36376?
CVE-2021-36376 is classified under CWE-23: Relative Path Traversal (The product uses external input to construct a pathname that should be within a restricted directory, but it does not properly neutralize sequences such as ".." that can resolve to a location that is outside of that directory.).
How can I check crates.io dependencies for CVE-2021-36376?
Run the dependency tree command: 'inspect dependencies for git-delta'. 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-5xg3-j2j6-rcx4",
  "modified" : "2021-09-09T16:46:42Z",
  "published" : "2021-08-25T21:01:39Z",
  "aliases" : [ "CVE-2021-36376" ],
  "summary" : "Relative Path Traversal in git-delta",
  "details" : "git-delta before 0.8.3 on Windows resolves an executable's pathname as a relative path from the current directory.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "crates.io",
      "name" : "git-delta"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.8.3"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-36376"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/dandavison/delta/commit/f01846bd443aaf92fdd5ac20f461beac3f6ee3fd"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/dandavison/delta"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/dandavison/delta/releases/tag/0.8.3"
  }, {
    "type" : "WEB",
    "url" : "https://rustsec.org/advisories/RUSTSEC-2021-0105.html"
  }, {
    "type" : "WEB",
    "url" : "https://vuln.ryotak.me/advisories/54"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-23", "CWE-427" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-07-14T19:06:14Z",
    "nvd_published_at" : "2021-07-13T13:15:00Z"
  }
}