CVE-2022-31100: Rulex Reachable Assertion Vulnerability

MODERATE
Advisory Identifier: GHSA-8v9w-p43c-r885
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CVSS 6.5
CWE-617
Published
Advisory Summary

CVE-2022-31100 is a MODERATE (CVSS 6.5) reachable assertion vulnerability (CWE-617: Reachable Assertion) affecting Rulex libraries in the crates.io ecosystem. The issue involves reachable assertion in rulex. Remediation is available by upgrading affected packages to version 0.4.3.

CVE-2022-31100 at a Glance

CVE Identifier CVE-2022-31100
GHSA Identifier GHSA-8v9w-p43c-r885
Severity MODERATE
CVSS v3.1 Base Score 6.5
CWE Classification CWE-617: Reachable Assertion
Affected Product Rulex
Package Ecosystem crates.io
Published Date
Last Updated

Security Impact

CVSS: 6.5

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

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required Low (PR:L)
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-2022-31100

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

rulex fixed: 0.4.3 
Upgrade rulex to 0.4.3
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 rulex

How to Check if You Are Affected

To determine whether your application is affected by CVE-2022-31100, inspect your project dependencies for Rulex:

inspect dependencies for rulex

Analyze the terminal output to locate any version of Rulex in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.4.3), 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-617: Reachable Assertion, where the product contains an assert() or similar statement that can be triggered by an attacker, which leads to an application exit or other behavior that is more severe than necessary. In Rulex, 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 When parsing untrusted rulex expressions, rulex may crash, possibly enabling a Denial of Service attack. This happens when the expression contains a multi-byte UTF-8 code point in a string literal or after a backslash, because rulex tries to slice into the code point and panics as a result. This is a security concern for you, if - your service parses untrusted rulex expressions (expressions provided by an untrusted user), and - your service becomes unavailable when the thread running rulex panics. ### Patches The crashes are fixed in version **0.4.3**. Affected users are advised to update to this version. ### Workarounds You can use `catch_unwind` to recover from panics. ### For more information If you have any questions or comments about this advisory: * Open an issue in [rulex](https://github.com/rulex-rs/rulex/issues) * Email me at [ludwig.stecher@gmx.de](mailto:ludwig.stecher@gmx.de) ### Credits Credit for finding these bugs goes to - [cargo fuzz](https://github.com/rust-fuzz/cargo-fuzz) and [afl.rs](https://github.com/rust-fuzz/afl.rs) - [evanrichter](https://github.com/evanrichter) - [ForAllSecure Mayhem](https://forallsecure.com/)

CVE-2022-31100 Affected Rulex Versions

1 component(s)
Fixed Versions:
0.4.3
Product / Package Ecosystem Affected Versions Fixed Version
rulex
 crates.io
< 0.4.3
0.4.3

References

GitHub Advisory / Wiki ADVISORY
https://github.com/rulex-rs/rulex/security/advisories/GHSA-8v9w-p43c-r885
NVD — CVE-2022-31100 NVD
https://nvd.nist.gov/vuln/detail/CVE-2022-31100
Security Fix Commit FIX COMMIT
https://github.com/rulex-rs/rulex/commit/fac6d58b25c6f9f8c0a6cdc4dec75b37b219f1d6
Rulex Source Repository REPOSITORY
https://github.com/rulex-rs/rulex
rustsec.org/advisories/rustsec-... WEB
https://rustsec.org/advisories/RUSTSEC-2022-0031.html

Frequently Asked Questions

What is CVE-2022-31100?
CVE-2022-31100 is a security vulnerability in Rulex involving Reachable Assertion in rulex under CWE-617: Reachable Assertion.
Which Rulex versions are affected?
Affected versions include releases prior to 0.4.3 across affected packages: rulex.
What version fixes CVE-2022-31100?
Upgrading to 0.4.3 (or the latest patched release for your respective branch) resolves the vulnerability.
Is rulex affected?
Yes, rulex is affected in releases prior to 0.4.3. Upgrade your dependency to 0.4.3 or later.
What is the CVSS score of CVE-2022-31100?
CVE-2022-31100 has a CVSS v3.1 base score of 6.5 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2022-31100?
CVE-2022-31100 is classified under CWE-617: Reachable Assertion (The product contains an assert() or similar statement that can be triggered by an attacker, which leads to an application exit or other behavior that is more severe than necessary.).
How can I check crates.io dependencies for CVE-2022-31100?
Run the dependency tree command: 'inspect dependencies for rulex'. 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-8v9w-p43c-r885",
  "modified" : "2022-06-29T21:42:56Z",
  "published" : "2022-06-21T20:12:15Z",
  "aliases" : [ "CVE-2022-31100" ],
  "summary" : "Reachable Assertion in rulex",
  "details" : "### Impact\nWhen parsing untrusted rulex expressions, rulex may crash, possibly enabling a Denial of Service attack. This happens when the expression contains a multi-byte UTF-8 code point in a string literal or after a backslash, because rulex tries to slice into the code point and panics as a result.\n\nThis is a security concern for you, if\n- your service parses untrusted rulex expressions (expressions provided by an untrusted user), and\n- your service becomes unavailable when the thread running rulex panics.\n\n### Patches\nThe crashes are fixed in version **0.4.3**. Affected users are advised to update to this version.\n\n### Workarounds\nYou can use `catch_unwind` to recover from panics.\n\n### For more information\nIf you have any questions or comments about this advisory:\n* Open an issue in [rulex](https://github.com/rulex-rs/rulex/issues)\n* Email me at [ludwig.stecher@gmx.de](mailto:ludwig.stecher@gmx.de)\n\n### Credits\n\nCredit for finding these bugs goes to\n\n- [cargo fuzz](https://github.com/rust-fuzz/cargo-fuzz) and [afl.rs](https://github.com/rust-fuzz/afl.rs)\n- [evanrichter](https://github.com/evanrichter)\n- [ForAllSecure Mayhem](https://forallsecure.com/)",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "crates.io",
      "name" : "rulex"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.4.3"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/rulex-rs/rulex/security/advisories/GHSA-8v9w-p43c-r885"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2022-31100"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/rulex-rs/rulex/commit/fac6d58b25c6f9f8c0a6cdc4dec75b37b219f1d6"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/rulex-rs/rulex"
  }, {
    "type" : "WEB",
    "url" : "https://rustsec.org/advisories/RUSTSEC-2022-0031.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-617" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-06-21T20:12:15Z",
    "nvd_published_at" : "2022-06-27T22:15:00Z"
  }
}