GHSA-r8wq-qrxc-hmcm
- 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
- Aliases
- Published
- 2021-11-29T17:58:59Z
- Modified
- 2023-11-08T04:07:27.373064Z
- 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.schemapackage 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
For more information
If you have any questions or comments about this advisory: * Open an issue in python-ldap tracker
- References
Affected packages
PyPI / python-ldap
Package
- Name
- python-ldap
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