Bug 2044615 (CVE-2021-46823)

Summary:	CVE-2021-46823 python-ldap: Regular expression denial of service in LDAP schema parser
Product:	[Other] Security Response	Reporter:	Pedro Sampaio <psampaio>
Component:	vulnerability	Assignee:	Nobody <nobody>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	abokovoy, adudiak, apevec, aviso, bcoca, bdettelb, caillon+fedoraproject, cheimes, cmeyers, davidn, dbecker, gblomqui, jcammara, jhardy, jjoyce, jobarker, jschluet, karlthered, lhh, lpeer, mabashia, mburns, m.cyprian, notting, osapryki, python-sig, relrod, rhos-maint, rpetrell, rstrode, sandmann, sclewis, sdoran, slinaber, smcdonal, spichugi, stcannon, tfister, tkuratom, vanmeeuwen+fedora
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	python-ldap 3.4.0	Doc Type:	If docs needed, set a value
Doc Text:	A flaw was found in python-ldap. The vulnerability occurs due to a regular expression and leads to a denial of service attack. This flaw allows an attacker to parse LDAP schema definitions from an untrusted source, leading to a crash or code execution.	Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2046511, 2046512, 2051813, 2051814, 2051815, 2051816, 2051817, 2051819
Bug Blocks:	2044617

Description Pedro Sampaio 2022-01-24 20:09:09 UTC

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.

References:

https://github.com/python-ldap/python-ldap/security/advisories/GHSA-r8wq-qrxc-hmcm

Comment 3 Thomas Eagle 2022-01-26 20:42:36 UTC

while flaw is present in AAP and Ansible Tower, and can be corrected by upgrading to python-ldap 3.4, issue is mitigated due to current input sanitization that occurs in the code.

Comment 4 Summer Long 2022-01-28 01:47:12 UTC

Upstream commits: https://github.com/python-ldap/python-ldap/pull/444/commits

Comment 7 Sandipan Roy 2022-02-08 05:55:26 UTC

Created python-ldap tracking bugs for this issue:

Affects: fedora-all [bug 2051816]


Created python-ldap3 tracking bugs for this issue:

Affects: epel-all [bug 2051817]
Affects: fedora-all [bug 2051815]
Affects: openstack-rdo [bug 2051813]

Comment 10 Avram Lubkin 2022-03-30 14:24:06 UTC

Why are there bugs against python-ldap3 if the bug is in a different package, python-ldap? They are different projects that do not share a codebase.

Comment 15 juneau 2022-09-27 12:21:18 UTC

marking Services notaffected per ./static/#/flaw/2044615#comment3