CVE-2022-43756: Github.com/rancher/wrangler Denial of Service Vulnerability

MODERATE
Advisory Identifier: GHSA-8fcj-gf77-47mg
CVSS 5.9
CWE-150 CWE-74
Published
Advisory Summary

CVE-2022-43756 is a MODERATE (CVSS 5.9) denial of service vulnerability (CWE-150: Improper Neutralization of Escape, Meta, or Control Sequences) affecting Github.com/rancher/wrangler libraries in the Go ecosystem. The issue involves denial of service (dos) when processing git credentials. Remediation is available by upgrading affected packages to version 0.7.4-security1, 0.8.5-security1, 1.0.1, 0.8.11.

CVE-2022-43756 at a Glance

CVE Identifier CVE-2022-43756
GHSA Identifier GHSA-8fcj-gf77-47mg
Severity MODERATE
CVSS v3.1 Base Score 5.9
CWE Classification CWE-150: Improper Neutralization of Escape, Meta, or Control Sequences
Affected Product Github.com/rancher/wrangler
Package Ecosystem Go
Published Date
Last Updated

Security Impact

CVSS: 5.9

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

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

How to Fix CVE-2022-43756

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

github.com/rancher/wrangler fixed: 0.7.4-security1
Upgrade github.com/rancher/wrangler to 0.7.4-security1
github.com/rancher/wrangler fixed: 0.8.5-security1
Upgrade github.com/rancher/wrangler to 0.8.5-security1
github.com/rancher/wrangler fixed: 1.0.1
Upgrade github.com/rancher/wrangler to 1.0.1
github.com/rancher/wrangler fixed: 0.8.11
Upgrade github.com/rancher/wrangler to 0.8.11
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 github.com/rancher/wrangler

How to Check if You Are Affected

To determine whether your application is affected by CVE-2022-43756, inspect your project dependencies for Github.com/rancher/wrangler:

inspect dependencies for github.com/rancher/wrangler

Analyze the terminal output to locate any version of Github.com/rancher/wrangler in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.7.4-security1), 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-150: Improper Neutralization of Escape, Meta, or Control Sequences, where the product receives input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could be interpreted as escape, meta, or control character sequences when they are sent to a downstream component. In Github.com/rancher/wrangler, 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

### Impact A denial of services (DoS) vulnerability was discovered in Wrangler Git package affecting versions up to and including `v1.0.0`. Specially crafted Git credentials can result in a denial of service (DoS) attack on an application that uses Wrangler due to the exhaustion of the available memory and CPU resources. This is caused by a lack of input validation of Git credentials before they are used, which may lead to a denial of service in some cases. This issue can be triggered when accessing both private and public Git repositories. ### Workarounds A workaround is to sanitize input passed to the Git package to remove potential unsafe and ambiguous characters. Otherwise, the best course of action is to update to a patched Wrangler version. ### Patches Patched versions include `v1.0.1` and later and the backported tags - `v0.7.4-security1`, `v0.8.5-security1` and `v0.8.11`. ### For more information If you have any questions or comments about this advisory: * Reach out to [SUSE Rancher Security team](https://github.com/rancher/rancher/security/policy) for security related inquiries. * Open an issue in [Rancher](https://github.com/rancher/rancher/issues/new/choose) or [Wrangler](https://github.com/rancher/wrangler/issues/new) repository. * Verify our [support matrix](https://www.suse.com/suse-rancher/support-matrix/all-supported-versions/) and [product support lifecycle](https://www.suse.com/lifecycle/).

CVE-2022-43756 Affected Github.com/rancher/wrangler Versions

4 component(s)
Fixed Versions:
0.7.4-security10.8.5-security11.0.10.8.11
Product / Package Ecosystem Affected Versions Fixed Version
github.com/rancher/wrangler
Go
< 0.7.4-security1
0.7.4-security1
github.com/rancher/wrangler
Go
≥ 0.8.0
< 0.8.5-security1
0.8.5-security1
github.com/rancher/wrangler
Go
≥ 1.0.0
< 1.0.1
All 1 versions
1.0.0
1.0.1
github.com/rancher/wrangler
Go
≥ 0.8.6
< 0.8.11
0.8.11

References

Frequently Asked Questions

What is CVE-2022-43756?
CVE-2022-43756 is a security vulnerability in Github.com/rancher/wrangler involving Denial of service (DoS) when processing Git credentials under CWE-150: Improper Neutralization of Escape, Meta, or Control Sequences.
Which Github.com/rancher/wrangler versions are affected?
Affected versions include releases prior to 0.7.4-security1, 0.8.5-security1, 1.0.1, 0.8.11 across affected packages: github.com/rancher/wrangler.
What version fixes CVE-2022-43756?
Upgrading to 0.7.4-security1, 0.8.5-security1, 1.0.1, 0.8.11 (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/rancher/wrangler affected?
Yes, github.com/rancher/wrangler is affected in releases prior to 0.7.4-security1, 0.8.5-security1, 1.0.1, 0.8.11. Upgrade your dependency to 0.7.4-security1, 0.8.5-security1, 1.0.1, 0.8.11 or later.
What is the CVSS score of CVE-2022-43756?
CVE-2022-43756 has a CVSS v3.1 base score of 5.9 (MODERATE) with vector string CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:H.
What CWE is associated with CVE-2022-43756?
CVE-2022-43756 is classified under CWE-150: Improper Neutralization of Escape, Meta, or Control Sequences (The product receives input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could be interpreted as escape, meta, or control character sequences when they are sent to a downstream component.).
How can I check Go dependencies for CVE-2022-43756?
Run the dependency tree command: 'inspect dependencies for github.com/rancher/wrangler'. 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
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-8fcj-gf77-47mg",
  "modified" : "2023-02-07T15:50:58Z",
  "published" : "2023-01-25T19:40:26Z",
  "aliases" : [ "CVE-2022-43756" ],
  "summary" : "Denial of service (DoS) when processing Git credentials",
  "details" : "### Impact\n\nA denial of services (DoS) vulnerability was discovered in Wrangler Git package affecting versions up to and including `v1.0.0`.\n\nSpecially crafted Git credentials can result in a denial of service (DoS) attack on an application that uses Wrangler due to the exhaustion of the available memory and CPU resources. This is caused by a lack of input validation of Git credentials before they are used, which may lead to a denial of service in some cases. This issue can be triggered when accessing both private and public Git repositories. \n\n### Workarounds\n\nA workaround is to sanitize input passed to the Git package to remove potential unsafe and ambiguous characters. Otherwise, the best course of action is to update to a patched Wrangler version.\n\n### Patches\n\nPatched versions include `v1.0.1` and later and the backported tags - `v0.7.4-security1`, `v0.8.5-security1` and `v0.8.11`.\n\n### For more information\n\nIf you have any questions or comments about this advisory:\n\n* Reach out to [SUSE Rancher Security team](https://github.com/rancher/rancher/security/policy) for security related inquiries.\n* Open an issue in [Rancher](https://github.com/rancher/rancher/issues/new/choose) or [Wrangler](https://github.com/rancher/wrangler/issues/new) repository.\n* Verify our [support matrix](https://www.suse.com/suse-rancher/support-matrix/all-supported-versions/) and [product support lifecycle](https://www.suse.com/lifecycle/).",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/rancher/wrangler"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.7.4-security1"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 0.7.3"
    }
  }, {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/rancher/wrangler"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0.8.0"
      }, {
        "fixed" : "0.8.5-security1"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 0.8.4"
    }
  }, {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/rancher/wrangler"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "1.0.0"
      }, {
        "fixed" : "1.0.1"
      } ]
    } ],
    "versions" : [ "1.0.0" ]
  }, {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/rancher/wrangler"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0.8.6"
      }, {
        "fixed" : "0.8.11"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/rancher/wrangler/security/advisories/GHSA-8fcj-gf77-47mg"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2022-43756"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/rancher/wrangler/commit/341018c8fef3e12867c7cb2649bd2cecac75f287"
  }, {
    "type" : "WEB",
    "url" : "https://bugzilla.suse.com/show_bug.cgi?id=1205296"
  }, {
    "type" : "ADVISORY",
    "url" : "https://github.com/advisories/GHSA-8fcj-gf77-47mg"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/rancher/rancher/security/policy"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/rancher/wrangler"
  }, {
    "type" : "WEB",
    "url" : "https://pkg.go.dev/vuln/GO-2023-1515"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-150", "CWE-74" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2023-01-25T19:40:26Z",
    "nvd_published_at" : "2023-02-07T13:15:00Z"
  }
}