Vulnerabilities in pkg:pypi/matrix-sydent

PACKAGE
Advisory Identifier: GHSA-9jhm-8m8c-c3f4
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Advisory Summary

CVE-2021-29431 is a MODERATE (CVSS 7.7) ssrf vulnerability (CWE-20: Improper Input Validation) affecting Matrix sydent libraries in the PyPI ecosystem. The issue involves ssrf in sydent due to missing validation of hostnames. Remediation is available by upgrading affected packages to version 2.3.0.

7 Known Advisory Record(s)
Package Vulnerability Intelligence

pkg:pypi/matrix-sydent

7 Known Advisory Record(s)

Vulnerability advisories affecting package pkg:pypi/matrix-sydent. Select an advisory below to view technical details or fixes.

Advisory ID CVE / NVD Severity Summary
GHSA-9jhm-8m8c-c3f4 CVE-2021-29431 MODERATE SSRF in Sydent due to missing validation of hostnames
GHSA-gwf7-vfjf-wf6x CVE-2019-11842 HIGH matrix-sydent and matrix-synapse Use Cryptographically Weak PRNG
GHSA-mh74-4m5g-fcjx CVE-2021-29432 MODERATE Malicious users could abuse Sydent to control the content of invitation emails
GHSA-wmg4-8cp2-hpg9 CVE-2021-29430 HIGH Sydent vulnerable to denial of service attack via memory exhaustion
GHSA-pw4v-gr34-2553 CVE-2021-29433 MODERATE Sydent DoS (via resource exhaustion) due to improper input validation
GHSA-p6hw-wm59-3g5g CVE-2023-38686 CRITICAL Sydent does not verify email server certificates
GHSA-q9h8-gpw5-c95c CVE-2019-11340 MODERATE Matrix Sydent mishandles emails

CVE-2021-29431 at a Glance

CVE Identifier CVE-2021-29431
GHSA Identifier GHSA-9jhm-8m8c-c3f4
Severity MODERATE
CVSS v3.1 Base Score 7.7
CWE Classification CWE-20: Improper Input Validation
Affected Product Matrix sydent
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 7.7

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:C/C:H/I:N/A:N).

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

How to Fix CVE-2021-29431

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

matrix-sydent fixed: 2.3.0 
pip install matrix-sydent>=2.3.0
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

pip show matrix-sydent

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2021-29431, inspect your installed packages using pip:

pip show matrix-sydent

Analyze the terminal output to locate any version of Matrix sydent in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.3.0), your application is affected.

Note: The pip show matrix-sydent command checks currently installed packages in your active Python environment.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-20: Improper Input Validation, where the product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. In Matrix sydent, 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 Sydent can be induced to send HTTP GET requests to internal systems, due to lack of parameter validation or IP address blacklisting. It is not possible to exfiltrate data or control request headers, but it might be possible to use the attack to perform an internal port enumeration. ### Patches Fixed in 9e57334, 8936925, 3d531ed, 0f00412 ### Workarounds A potential workaround would be to use a firewall to ensure that Sydent cannot reach internal HTTP resources. ### For more information If you have any questions or comments about this advisory, email us at security@matrix.org.

CVE-2021-29431 Affected Matrix sydent Versions

1 component(s)
Fixed Versions:
2.3.0
Product / Package Ecosystem Affected Versions Fixed Version
matrix-sydent
pypi/matrix-sydent
PyPI
< 2.3.0
2.3.0

References

GitHub Advisory / Wiki ADVISORY
https://github.com/matrix-org/sydent/security/advisories/GHSA-9jhm-8m8c-c3f4
NVD — CVE-2021-29431 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-29431
Security Fix Commit FIX COMMIT
https://github.com/matrix-org/sydent/commit/0f00412017f25619bc36c264b29ea96808bf310a
Security Fix Commit FIX COMMIT
https://github.com/matrix-org/sydent/commit/3d531ed50d2fd41ac387f36d44d3fb2c62dd22d3
Security Fix Commit FIX COMMIT
https://github.com/matrix-org/sydent/commit/8936925f561b0c352c2fa922d5097d7245aad00a
Security Fix Commit FIX COMMIT
https://github.com/matrix-org/sydent/commit/9e573348d81df8191bbe8c266c01999c9d57cd5f
Matrix sydent Source Repository REPOSITORY
https://github.com/matrix-org/sydent
Matrix sydent Release RELEASE
https://github.com/matrix-org/sydent/releases/tag/v2.3.0
Matrix sydent Source Repository REPOSITORY
https://github.com/pypa/advisory-database/tree/main/vulns/matrix-sydent/PYSEC-2021-22.yaml
pypi.org/project/matrix-syde... WEB
https://pypi.org/project/matrix-sydent

Frequently Asked Questions

What is CVE-2021-29431?
CVE-2021-29431 is a security vulnerability in Matrix sydent involving SSRF in Sydent due to missing validation of hostnames under CWE-20: Improper Input Validation.
Which Matrix sydent versions are affected?
Affected versions include releases prior to 2.3.0 across affected packages: matrix-sydent.
What version fixes CVE-2021-29431?
Upgrading to 2.3.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is matrix-sydent affected?
Yes, matrix-sydent is affected in releases prior to 2.3.0. Upgrade your dependency to 2.3.0 or later.
What is the CVSS score of CVE-2021-29431?
CVE-2021-29431 has a CVSS v3.1 base score of 7.7 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N.
What CWE is associated with CVE-2021-29431?
CVE-2021-29431 is classified under CWE-20: Improper Input Validation (The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.).
How can I check PyPI dependencies for CVE-2021-29431?
Run the dependency tree command: 'pip show matrix-sydent'. 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-9jhm-8m8c-c3f4",
  "modified" : "2024-09-30T20:40:49Z",
  "published" : "2021-04-19T14:54:15Z",
  "aliases" : [ "CVE-2021-29431" ],
  "summary" : "SSRF in Sydent due to missing validation of hostnames",
  "details" : "### Impact\n\nSydent can be induced to send HTTP GET requests to internal systems, due to lack of parameter validation or IP address blacklisting.\n\nIt is not possible to exfiltrate data or control request headers, but it might be possible to use the attack to perform an internal port enumeration.\n\n### Patches\n\nFixed in 9e57334, 8936925, 3d531ed, 0f00412\n\n### Workarounds\n\nA potential workaround would be to use a firewall to ensure that Sydent cannot reach internal HTTP resources.\n\n### For more information\n\nIf you have any questions or comments about this advisory, email us at security@matrix.org.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "matrix-sydent"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.3.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/matrix-org/sydent/security/advisories/GHSA-9jhm-8m8c-c3f4"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-29431"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/matrix-org/sydent/commit/0f00412017f25619bc36c264b29ea96808bf310a"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/matrix-org/sydent/commit/3d531ed50d2fd41ac387f36d44d3fb2c62dd22d3"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/matrix-org/sydent/commit/8936925f561b0c352c2fa922d5097d7245aad00a"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/matrix-org/sydent/commit/9e573348d81df8191bbe8c266c01999c9d57cd5f"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/matrix-org/sydent"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/matrix-org/sydent/releases/tag/v2.3.0"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pypa/advisory-database/tree/main/vulns/matrix-sydent/PYSEC-2021-22.yaml"
  }, {
    "type" : "WEB",
    "url" : "https://pypi.org/project/matrix-sydent"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-20", "CWE-918" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-04-15T21:00:29Z",
    "nvd_published_at" : "2021-04-15T21:15:00Z"
  }
}