GHSA-r8wq-qrxc-hmcm

Suggest an improvement
Source
https://github.com/advisories/GHSA-r8wq-qrxc-hmcm
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/11/GHSA-r8wq-qrxc-hmcm/GHSA-r8wq-qrxc-hmcm.json
JSON Data
https://api.test.osv.dev/v1/vulns/GHSA-r8wq-qrxc-hmcm
Related
Published
2021-11-29T17:58:59Z
Modified
2024-12-02T05:44:54.209498Z
Severity
  • 6.5 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
ReDoS in LDAP schema parser
Details

https://github.com/python-ldap/python-ldap/issues/424

Impact

The LDAP schema parser of python-ldap 3.3.1 and earlier are vulnerable to a regular expression denial-of-service attack. The issue affects clients that use ldap.schema package to parse LDAP schema definitions from an untrusted source.

Patches

The upcoming release of python-ldap 3.4.0 will contain a workaround to prevent ReDoS attacks. The schema parser refuses schema definitions with an excessive amount of backslashes.

Workarounds

As a workaround, users can check input for excessive amount of backslashes in schemas. More than a dozen backslashes per line are atypical.

References

CWE-1333

For more information

If you have any questions or comments about this advisory: * Open an issue in python-ldap tracker

Database specific 
{
    "github_reviewed_at": "2021-11-26T18:26:27Z",
    "cwe_ids": [
        "CWE-1333"
    ],
    "nvd_published_at": null,
    "github_reviewed": true,
    "severity": "MODERATE"
}
References

Affected packages

PyPI / python-ldap

Package

Name
python-ldap
View open source insights on deps.dev
Purl
pkg:pypi/python-ldap

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
3.4.0

Affected versions

2.*

2.3.13
2.4.0
2.4.1
2.4.2
2.4.3
2.4.4
2.4.5
2.4.6
2.4.7
2.4.8
2.4.9
2.4.10
2.4.12
2.4.13
2.4.14
2.4.15
2.4.16
2.4.17
2.4.18
2.4.19
2.4.20
2.4.21
2.4.22
2.4.25
2.4.26
2.4.27
2.4.28
2.4.29
2.4.30
2.4.31
2.4.32
2.4.33
2.4.35
2.4.36
2.4.37
2.4.38
2.4.39
2.4.40
2.4.41
2.4.42
2.4.43
2.4.44
2.4.45
2.5.1
2.5.2

3.*

3.0.0b1
3.0.0b2
3.0.0b3
3.0.0b4
3.0.0
3.1.0
3.2.0
3.3.0
3.3.1