CVE-2020-25574: Http Integer Overflow/Infinite Loop Vulnerability

HIGH
Advisory Identifier: GHSA-x7vr-c387-8w57
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CVSS 7.5
CWE-190 CWE-835
Published
Advisory Summary

CVE-2020-25574 is a HIGH (CVSS 7.5) integer overflow/infinite loop vulnerability (CWE-190: Integer Overflow or Wraparound) affecting Http libraries in the crates.io ecosystem. The issue involves integer overflow/infinite loop in the http crate. Remediation is available by upgrading affected packages to version 0.1.20.

CVE-2020-25574 at a Glance

CVE Identifier CVE-2020-25574
GHSA Identifier GHSA-x7vr-c387-8w57
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-190: Integer Overflow or Wraparound
Affected Product Http
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-2020-25574

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

http fixed: 0.1.20 
Upgrade http to 0.1.20
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 http

How to Check if You Are Affected

To determine whether your application is affected by CVE-2020-25574, inspect your project dependencies for Http:

inspect dependencies for http

Analyze the terminal output to locate any version of Http in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.1.20), 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 Http, 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

HeaderMap::reserve() used usize::next_power_of_two() to calculate the increased capacity. However, next_power_of_two() silently overflows to 0 if given a sufficiently large number in release mode. If the map was not empty when the overflow happens, the library will invoke self.grow(0) and start infinite probing. This allows an attacker who controls the argument to reserve() to cause a potential denial of service (DoS). The flaw was corrected in 0.1.20 release of http crate.

CVE-2020-25574 Affected Http Versions

1 component(s)
Fixed Versions:
0.1.20
Product / Package Ecosystem Affected Versions Fixed Version
http
 crates.io
< 0.1.20
0.1.20

References

NVD — CVE-2020-25574 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-25574
Http Source Repository REPOSITORY
https://github.com/hyperium/http/issues/352
Http Source Repository REPOSITORY
https://github.com/hyperium/http
rustsec.org/advisories/rustsec-... WEB
https://rustsec.org/advisories/RUSTSEC-2019-0033.html

Frequently Asked Questions

What is CVE-2020-25574?
CVE-2020-25574 is a security vulnerability in Http involving Integer Overflow/Infinite Loop in the http crate under CWE-190: Integer Overflow or Wraparound.
Which Http versions are affected?
Affected versions include releases prior to 0.1.20 across affected packages: http.
What version fixes CVE-2020-25574?
Upgrading to 0.1.20 (or the latest patched release for your respective branch) resolves the vulnerability.
Is http affected?
Yes, http is affected in releases prior to 0.1.20. Upgrade your dependency to 0.1.20 or later.
What is the CVSS score of CVE-2020-25574?
CVE-2020-25574 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-2020-25574?
CVE-2020-25574 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-2020-25574?
Run the dependency tree command: 'inspect dependencies for http'. 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-x7vr-c387-8w57",
  "modified" : "2023-06-13T18:21:10Z",
  "published" : "2021-08-25T21:01:31Z",
  "aliases" : [ "CVE-2020-25574" ],
  "summary" : "Integer Overflow/Infinite Loop in the http crate",
  "details" : "HeaderMap::reserve() used usize::next_power_of_two() to calculate the increased capacity. However, next_power_of_two() silently overflows to 0 if given a sufficiently large number in release mode.\n\nIf the map was not empty when the overflow happens, the library will invoke self.grow(0) and start infinite probing. This allows an attacker who controls the argument to reserve() to cause a potential denial of service (DoS).\n\nThe flaw was corrected in 0.1.20 release of http crate.",
  "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" : "http"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.1.20"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-25574"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/hyperium/http/issues/352"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/hyperium/http"
  }, {
    "type" : "WEB",
    "url" : "https://rustsec.org/advisories/RUSTSEC-2019-0033.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-190", "CWE-835" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-07-26T18:47:31Z",
    "nvd_published_at" : "2020-09-14T19:15:00Z"
  }
}