CVE-2019-3883

389-ds-base: DoS via hanging secured connections

Severity Score

7.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

In 389-ds-base up to version 1.4.1.2, requests are handled by workers threads. Each sockets will be waited by the worker for at most 'ioblocktimeout' seconds. However this timeout applies only for un-encrypted requests. Connections using SSL/TLS are not taking this timeout into account during reads, and may hang longer.An unauthenticated attacker could repeatedly create hanging LDAP requests to hang all the workers, resulting in a Denial of Service.

En 389-ds-base hasta la versión 1.4.1.2, las peticiones son manejadas por hilos de trabajo. Cada conexión será esperada mediante el trabajador durante un máximo de segundos de 'ioblocktimeout'. Sin embargo, este tiempo de espera se aplica solo para peticiones sin cifrar. Las conexiones que usan SSL/TLS no toman en cuenta este tiempo de espera durante l

It was found that encrypted connections did not honor the 'ioblocktimeout' parameter to end blocking requests. As a result, an unauthenticated attacker could repeatedly start a sufficient number of encrypted connections to block all workers, resulting in a denial of service.

*Credits: N/A

CVSS Scores

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

Low

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2019-01-03 CVE Reserved
2019-04-17 CVE Published
2024-08-04 CVE Updated
2024-09-07 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-772: Missing Release of Resource after Effective Lifetime

CAPEC

References (9)

URL	Tag	Source
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3883	Issue Tracking
https://lists.debian.org/debian-lts-announce/2019/05/msg00008.html	Mailing List
https://lists.debian.org/debian-lts-announce/2023/04/msg00026.html	Mailing List
https://pagure.io/389-ds-base/issue/50329	Issue Tracking
https://pagure.io/389-ds-base/pull-request/50331	Third Party Advisory

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://access.redhat.com/errata/RHSA-2019:1896	2023-04-24
https://access.redhat.com/errata/RHSA-2019:3401	2023-04-24
https://access.redhat.com/security/cve/CVE-2019-3883	2019-11-05
https://bugzilla.redhat.com/show_bug.cgi?id=1693612	2019-11-05

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Fedoraproject Search vendor "Fedoraproject"		389 Directory Server Search vendor "Fedoraproject" for product "389 Directory Server"				<= 1.4.1.2 Search vendor "Fedoraproject" for product "389 Directory Server" and version " <= 1.4.1.2"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				8.0 Search vendor "Debian" for product "Debian Linux" and version "8.0"		-		Affected
Redhat Search vendor "Redhat"		Enterprise Linux Search vendor "Redhat" for product "Enterprise Linux"				6.0 Search vendor "Redhat" for product "Enterprise Linux" and version "6.0"		-		Affected