CVE-2021-31826

Debian Security Advisory 4905-1

Severity Score

7.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

Shibboleth Service Provider 3.x before 3.2.2 is prone to a NULL pointer dereference flaw involving the session recovery feature. The flaw is exploitable (for a daemon crash) on systems not using this feature if a crafted cookie is supplied.

Shibboleth Service Provider versiones 3.x anteriores a 3.2.2, es propenso a un fallo de desreferencia del puntero NULL que involucra la funcionalidad session recovery. El fallo es explotable (para un bloqueo del demonio) en sistemas que no usan esta funcionalidad si es suministrada una cookie diseñada

It was discovered that the Shibboleth Service Provider is prone to a NULL pointer dereference flaw in the cookie-based session recovery feature. A remote, unauthenticated attacker can take advantage of this flaw to cause a denial of service (crash in the shibd daemon/service).

*Credits: N/A

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

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-04-27 CVE Reserved
2021-04-27 CVE Published
2024-08-03 CVE Updated
2024-08-03 First Exploit
2025-03-30 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-476: NULL Pointer Dereference

CAPEC

References (5)

URL	Tag	Source
https://bugs.debian.org/987608	Mailing List
https://git.shibboleth.net/view/?p=cpp-sp.git%3Ba=commit%3Bh=5a47c3b9378f4c49392dd4d15189b70956f9f2ec	X_refsource_misc

URL	Date	SRC
https://issues.shibboleth.net/jira/browse/SSPCPP-927	2024-08-03

URL	Date	SRC

URL	Date	SRC
https://shibboleth.net/community/advisories/secadv_20210426.txt	2023-11-07
https://www.debian.org/security/2021/dsa-4905	2023-11-07

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Shibboleth Search vendor "Shibboleth"		Service Provider Search vendor "Shibboleth" for product "Service Provider"				>= 3.0.0 < 3.2.2 Search vendor "Shibboleth" for product "Service Provider" and version " >= 3.0.0 < 3.2.2"		-		Affected