CVE-2023-22895: Bzip2 Denial of Service Vulnerability

HIGH
Advisory Identifier: GHSA-96jv-r488-c2rj
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CVSS 7.5
CWE-190
Published
Advisory Summary

CVE-2023-22895 is a HIGH (CVSS 7.5) denial of service vulnerability (CWE-190: Integer Overflow or Wraparound) affecting Bzip2 libraries in the crates.io ecosystem. The issue involves bzip2 allows attackers to cause a denial of service via a large file that triggers an integer overflow. Remediation is available by upgrading affected packages to version 0.4.4.

CVE-2023-22895 at a Glance

CVE Identifier CVE-2023-22895
GHSA Identifier GHSA-96jv-r488-c2rj
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-190: Integer Overflow or Wraparound
Affected Product Bzip2
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-2023-22895

To remediate this vulnerability, upgrade all affected Bzip2 dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

bzip2 fixed: 0.4.4 
Upgrade bzip2 to 0.4.4
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 bzip2

How to Check if You Are Affected

To determine whether your application is affected by CVE-2023-22895, inspect your project dependencies for Bzip2:

inspect dependencies for bzip2

Analyze the terminal output to locate any version of Bzip2 in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.4.4), 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-190: Integer Overflow or Wraparound, where the product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. this occurs when an integer value is incremented to a value that is too large to store in the associated representation. when this occurs, the value may become a very small or negative number. In Bzip2, 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

The bzip2 crate before 0.4.4 for Rust allow attackers to cause a denial of service via a large file that triggers an integer overflow in `mem.rs`. NOTE: this is unrelated to the https://crates.io/crates/bzip2-rs product.

CVE-2023-22895 Affected Bzip2 Versions

1 component(s)
Fixed Versions:
0.4.4
Product / Package Ecosystem Affected Versions Fixed Version
bzip2
 crates.io
< 0.4.4
0.4.4

References

NVD — CVE-2023-22895 NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-22895
Bzip2 Source Repository REPOSITORY
https://github.com/alexcrichton/bzip2-rs/pull/86
Security Fix Commit FIX COMMIT
https://github.com/alexcrichton/bzip2-rs/commit/90c9c182cd5a5ebc75810aebd89b347a7bdf590b
crates.io/crates/bzip2/versio... WEB
https://crates.io/crates/bzip2/versions
Bzip2 Source Repository REPOSITORY
https://github.com/alexcrichton/bzip2-rs
lists.fedoraproject.org/archives/list/packa... WEB
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MI5SVRSGKBWB2JGDLDVIFY5ZQVDZP6I7
lists.fedoraproject.org/archives/list/packa... WEB
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/SQK57GGXJX3AH7KF6S7S3N7JC5QOYUQ7
lists.fedoraproject.org/archives/list/packa... WEB
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UUK2JO25PPA6XBREKJRBLRCD22LKIOLO
rustsec.org/advisories/rustsec-... WEB
https://rustsec.org/advisories/RUSTSEC-2023-0004.html

Frequently Asked Questions

What is CVE-2023-22895?
CVE-2023-22895 is a security vulnerability in Bzip2 involving bzip2 allows attackers to cause a denial of service via a large file that triggers an integer overflow under CWE-190: Integer Overflow or Wraparound.
Which Bzip2 versions are affected?
Affected versions include releases prior to 0.4.4 across affected packages: bzip2.
What version fixes CVE-2023-22895?
Upgrading to 0.4.4 (or the latest patched release for your respective branch) resolves the vulnerability.
Is bzip2 affected?
Yes, bzip2 is affected in releases prior to 0.4.4. Upgrade your dependency to 0.4.4 or later.
What is the CVSS score of CVE-2023-22895?
CVE-2023-22895 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-2023-22895?
CVE-2023-22895 is classified under CWE-190: Integer Overflow or Wraparound (The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.).
How can I check crates.io dependencies for CVE-2023-22895?
Run the dependency tree command: 'inspect dependencies for bzip2'. 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-96jv-r488-c2rj",
  "modified" : "2023-01-13T17:18:40Z",
  "published" : "2023-01-10T03:30:29Z",
  "aliases" : [ "CVE-2023-22895" ],
  "summary" : "bzip2 allows attackers to cause a denial of service via a large file that triggers an integer overflow",
  "details" : "The bzip2 crate before 0.4.4 for Rust allow attackers to cause a denial of service via a large file that triggers an integer overflow in `mem.rs`. NOTE: this is unrelated to the https://crates.io/crates/bzip2-rs product.",
  "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" : "bzip2"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.4.4"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2023-22895"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/alexcrichton/bzip2-rs/pull/86"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/alexcrichton/bzip2-rs/commit/90c9c182cd5a5ebc75810aebd89b347a7bdf590b"
  }, {
    "type" : "WEB",
    "url" : "https://crates.io/crates/bzip2/versions"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/alexcrichton/bzip2-rs"
  }, {
    "type" : "WEB",
    "url" : "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MI5SVRSGKBWB2JGDLDVIFY5ZQVDZP6I7"
  }, {
    "type" : "WEB",
    "url" : "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/SQK57GGXJX3AH7KF6S7S3N7JC5QOYUQ7"
  }, {
    "type" : "WEB",
    "url" : "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UUK2JO25PPA6XBREKJRBLRCD22LKIOLO"
  }, {
    "type" : "WEB",
    "url" : "https://rustsec.org/advisories/RUSTSEC-2023-0004.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-190" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2023-01-10T22:10:17Z",
    "nvd_published_at" : "2023-01-10T01:15:00Z"
  }
}