CVE-2021-29625: Vrana/adminer Cross-Site Scripting Vulnerability

HIGH
Advisory Identifier: GHSA-2v82-5746-vwqc
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CVSS 7.5
CWE-79
Published
Advisory Summary

CVE-2021-29625 is a HIGH (CVSS 7.5) cross-site scripting vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting Vrana/adminer libraries in the Packagist ecosystem. The issue involves xss in doc_link. Remediation is available by upgrading affected packages to version 4.8.1.

CVE-2021-29625 at a Glance

CVE Identifier CVE-2021-29625
GHSA Identifier GHSA-2v82-5746-vwqc
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Product Vrana/adminer
Package Ecosystem Packagist
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:H/PR:N/UI:R/S:U/C:H/I:H/A:H).

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

How to Fix CVE-2021-29625

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

vrana/adminer fixed: 4.8.1 
Upgrade vrana/adminer to 4.8.1
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 vrana/adminer

How to Check if You Are Affected

To determine whether your application is affected by CVE-2021-29625, inspect your project dependencies for Vrana/adminer:

inspect dependencies for vrana/adminer

Analyze the terminal output to locate any version of Vrana/adminer in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 4.8.1), 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-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'), where the product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. In Vrana/adminer, 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 Users of MySQL, MariaDB, PgSQL and SQLite are affected. XSS is in most cases prevented by strict CSP in all modern browsers. The only exception is when Adminer is using a `pdo_` extension to communicate with the database (it is used if the native extensions are not enabled). In browsers without CSP, Adminer versions 4.6.1 to 4.8.0 are affected. ### Patches Patched by 4043092, included in version [4.8.1](https://github.com/vrana/adminer/releases/tag/v4.8.1). ### Workarounds Do both: * Use browser supporting strict CSP. * Enable the native PHP extensions (e.g. `mysqli`) or disable displaying PHP errors (`display_errors`). ### References https://sourceforge.net/p/adminer/bugs-and-features/797/ ### For more information If you have any questions or comments about this advisory: * Comment at 4043092.

CVE-2021-29625 Affected Vrana/adminer Versions

1 component(s)
Fixed Versions:
4.8.1
Product / Package Ecosystem Affected Versions Fixed Version
vrana/adminer
 Packagist
≥ 4.7.8
< 4.8.1
4.8.1

References

GitHub Advisory / Wiki ADVISORY
https://github.com/vrana/adminer/security/advisories/GHSA-2v82-5746-vwqc
NVD — CVE-2021-29625 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-29625
Security Fix Commit FIX COMMIT
https://github.com/vrana/adminer/commit/4043092ec2c0de2258d60a99d0c5958637d051a7
packagist.org/packages/vrana/admi... WEB
https://packagist.org/packages/vrana/adminer
sourceforge.net/p/adminer/bugs-and-... WEB
https://sourceforge.net/p/adminer/bugs-and-features/797

Frequently Asked Questions

What is CVE-2021-29625?
CVE-2021-29625 is a security vulnerability in Vrana/adminer involving XSS in doc_link under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').
Which Vrana/adminer versions are affected?
Affected versions include releases prior to 4.8.1 across affected packages: vrana/adminer.
What version fixes CVE-2021-29625?
Upgrading to 4.8.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is vrana/adminer affected?
Yes, vrana/adminer is affected in releases prior to 4.8.1. Upgrade your dependency to 4.8.1 or later.
What is the CVSS score of CVE-2021-29625?
CVE-2021-29625 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2021-29625?
CVE-2021-29625 is classified under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') (The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.).
How can I check Packagist dependencies for CVE-2021-29625?
Run the dependency tree command: 'inspect dependencies for vrana/adminer'. 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-2v82-5746-vwqc",
  "modified" : "2022-03-18T17:49:28Z",
  "published" : "2022-03-18T17:49:28Z",
  "aliases" : [ "CVE-2021-29625" ],
  "summary" : "XSS in doc_link",
  "details" : "### Impact\nUsers of MySQL, MariaDB, PgSQL and SQLite are affected. XSS is in most cases prevented by strict CSP in all modern browsers. The only exception is when Adminer is using a `pdo_` extension to communicate with the database (it is used if the native extensions are not enabled). In browsers without CSP, Adminer versions 4.6.1 to 4.8.0 are affected.\n\n### Patches\nPatched by 4043092, included in version [4.8.1](https://github.com/vrana/adminer/releases/tag/v4.8.1).\n\n### Workarounds\nDo both:\n* Use browser supporting strict CSP.\n* Enable the native PHP extensions (e.g. `mysqli`) or disable displaying PHP errors (`display_errors`).\n\n### References\nhttps://sourceforge.net/p/adminer/bugs-and-features/797/\n\n### For more information\nIf you have any questions or comments about this advisory:\n* Comment at 4043092.\n",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "vrana/adminer"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "4.7.8"
      }, {
        "fixed" : "4.8.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/vrana/adminer/security/advisories/GHSA-2v82-5746-vwqc"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-29625"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/vrana/adminer/commit/4043092ec2c0de2258d60a99d0c5958637d051a7"
  }, {
    "type" : "WEB",
    "url" : "https://packagist.org/packages/vrana/adminer"
  }, {
    "type" : "WEB",
    "url" : "https://sourceforge.net/p/adminer/bugs-and-features/797"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-05-17T19:18:12Z",
    "nvd_published_at" : "2021-05-19T22:15:00Z"
  }
}