CVE-2023-29197: Guzzlehttp/psr7 Improper Header Name Validation Vulnerability

MODERATE
Advisory Identifier: GHSA-wxmh-65f7-jcvw
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CVSS 5.3
CWE-436
Published
Advisory Summary

CVE-2023-29197 is a MODERATE (CVSS 5.3) improper header name validation vulnerability (CWE-436: Interpretation Conflict) affecting Guzzlehttp/psr7 libraries in the Packagist ecosystem. The issue involves improper header name validation in guzzlehttp/psr7. Remediation is available by upgrading affected packages to version 1.9.1, 2.4.5.

CVE-2023-29197 at a Glance

CVE Identifier CVE-2023-29197
GHSA Identifier GHSA-wxmh-65f7-jcvw
Severity MODERATE
CVSS v3.1 Base Score 5.3
CWE Classification CWE-436: Interpretation Conflict
Affected Product Guzzlehttp/psr7
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 5.3

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:L/A:N).

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 Low (I:L)
Availability None (A:N)

How to Fix CVE-2023-29197

To remediate this vulnerability, upgrade all affected Guzzlehttp/psr7 dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

guzzlehttp/psr7 fixed: 1.9.1 
Upgrade guzzlehttp/psr7 to 1.9.1
guzzlehttp/psr7 fixed: 2.4.5 
Upgrade guzzlehttp/psr7 to 2.4.5
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 guzzlehttp/psr7

How to Check if You Are Affected

To determine whether your application is affected by CVE-2023-29197, inspect your project dependencies for Guzzlehttp/psr7:

inspect dependencies for guzzlehttp/psr7

Analyze the terminal output to locate any version of Guzzlehttp/psr7 in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.9.1), 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-436: Interpretation Conflict, where product a handles inputs or steps differently than product b, which causes a to perform incorrect actions based on its perception of b's state. In Guzzlehttp/psr7, 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 Improper header parsing. An attacker could sneak in a newline (`\n`) into both the header names and values. While the specification states that `\r\n\r\n` is used to terminate the header list, many servers in the wild will also accept `\n\n`. ### Patches The issue is patched in 1.9.1 and 2.4.5. ### Workarounds There are no known workarounds. ### References * https://www.rfc-editor.org/rfc/rfc7230#section-3.2.4

CVE-2023-29197 Affected Guzzlehttp/psr7 Versions

2 component(s)
Fixed Versions:
1.9.12.4.5
Product / Package Ecosystem Affected Versions Fixed Version
guzzlehttp/psr7
 Packagist
< 1.9.1
1.9.1
guzzlehttp/psr7
 Packagist
≥ 2.0.0
< 2.4.5
2.4.5

References

GitHub Advisory / Wiki ADVISORY
https://github.com/guzzle/psr7/security/advisories/GHSA-q7rv-6hp3-vh96
GitHub Advisory / Wiki ADVISORY
https://github.com/guzzle/psr7/security/advisories/GHSA-wxmh-65f7-jcvw
NVD — CVE-2023-29197 NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-29197
MITRE CVE Database — CVE-2023-29197 MITRE
https://cve.mitre.org/cgi-bin/cvename.cgi?name=2022-24775
Guzzlehttp/psr7 Source Repository REPOSITORY
https://github.com/FriendsOfPHP/security-advisories/blob/master/guzzlehttp/psr7/CVE-2023-29197.yaml
Guzzlehttp/psr7 Source Repository REPOSITORY
https://github.com/guzzle/psr7
lists.debian.org/debian-lts-announce... WEB
https://lists.debian.org/debian-lts-announce/2023/12/msg00028.html
lists.fedoraproject.org/archives/list/packa... WEB
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/FJANWDXJZE5BGLN4MQ4FEHV5LJ6CMKQF
lists.fedoraproject.org/archives/list/packa... WEB
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/O35UN4IK6VS2LXSRWUDFWY7NI73RKY2U
www.rfc-editor.org/rfc/rfc7230 WEB
https://www.rfc-editor.org/rfc/rfc7230#section-3.2.4

Frequently Asked Questions

What is CVE-2023-29197?
CVE-2023-29197 is a security vulnerability in Guzzlehttp/psr7 involving Improper header name validation in guzzlehttp/psr7 under CWE-436: Interpretation Conflict.
Which Guzzlehttp/psr7 versions are affected?
Affected versions include releases prior to 1.9.1, 2.4.5 across affected packages: guzzlehttp/psr7.
What version fixes CVE-2023-29197?
Upgrading to 1.9.1, 2.4.5 (or the latest patched release for your respective branch) resolves the vulnerability.
Is guzzlehttp/psr7 affected?
Yes, guzzlehttp/psr7 is affected in releases prior to 1.9.1, 2.4.5. Upgrade your dependency to 1.9.1, 2.4.5 or later.
What is the CVSS score of CVE-2023-29197?
CVE-2023-29197 has a CVSS v3.1 base score of 5.3 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.
What CWE is associated with CVE-2023-29197?
CVE-2023-29197 is classified under CWE-436: Interpretation Conflict (Product A handles inputs or steps differently than Product B, which causes A to perform incorrect actions based on its perception of B's state.).
How can I check Packagist dependencies for CVE-2023-29197?
Run the dependency tree command: 'inspect dependencies for guzzlehttp/psr7'. 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-wxmh-65f7-jcvw",
  "modified" : "2023-04-19T18:25:53Z",
  "published" : "2023-04-19T18:25:53Z",
  "aliases" : [ "CVE-2023-29197" ],
  "summary" : "Improper header name validation in guzzlehttp/psr7",
  "details" : "### Impact\n\nImproper header parsing. An attacker could sneak in a newline (`\\n`) into both the header names and values. While the specification states that `\\r\\n\\r\\n` is used to terminate the header list, many servers in the wild will also accept `\\n\\n`.\n\n### Patches\n\nThe issue is patched in 1.9.1 and 2.4.5.\n\n### Workarounds\n\nThere are no known workarounds.\n\n### References\n\n* https://www.rfc-editor.org/rfc/rfc7230#section-3.2.4\n",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "guzzlehttp/psr7"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.9.1"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "guzzlehttp/psr7"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "2.0.0"
      }, {
        "fixed" : "2.4.5"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/guzzle/psr7/security/advisories/GHSA-q7rv-6hp3-vh96"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/guzzle/psr7/security/advisories/GHSA-wxmh-65f7-jcvw"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2023-29197"
  }, {
    "type" : "WEB",
    "url" : "https://cve.mitre.org/cgi-bin/cvename.cgi?name=2022-24775"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/FriendsOfPHP/security-advisories/blob/master/guzzlehttp/psr7/CVE-2023-29197.yaml"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/guzzle/psr7"
  }, {
    "type" : "WEB",
    "url" : "https://lists.debian.org/debian-lts-announce/2023/12/msg00028.html"
  }, {
    "type" : "WEB",
    "url" : "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/FJANWDXJZE5BGLN4MQ4FEHV5LJ6CMKQF"
  }, {
    "type" : "WEB",
    "url" : "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/O35UN4IK6VS2LXSRWUDFWY7NI73RKY2U"
  }, {
    "type" : "WEB",
    "url" : "https://www.rfc-editor.org/rfc/rfc7230#section-3.2.4"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-436" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2023-04-19T18:25:53Z",
    "nvd_published_at" : "2023-04-17T22:15:09Z"
  }
}