VDB-216786 · CVE-2021-44758 · GHSA-69h9-669w-88xv

Heimdal up to 7.7.0 SPNEGO Acceptor preferred_mech_type null pointer dereference

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5.4	$0-$5k	0.00

Summaryinfo

A vulnerability labeled as problematic has been found in Heimdal up to 7.7.0. This impacts an unknown function of the component SPNEGO Acceptor. The manipulation of the argument preferred_mech_type results in null pointer dereference. This vulnerability is identified as CVE-2021-44758. There is not any exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Heimdal up to 7.7.0. Affected is an unknown part of the component SPNEGO Acceptor. The manipulation of the argument preferred_mech_type with an unknown input leads to a null pointer dereference vulnerability. CWE is classifying the issue as CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. This is going to have an impact on availability. CVE summarizes:

Heimdal before 7.7.1 allows attackers to cause a NULL pointer dereference in a SPNEGO acceptor via a preferred_mech_type of GSS_C_NO_OID and a nonzero initial_response value to send_accept.

The weakness was released 12/26/2022 as GHSA-69h9-669w-88xv. The advisory is available at github.com. This vulnerability is traded as CVE-2021-44758 since 12/08/2021. Technical details are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 211098 (Fedora 37 : heimdal (2022-2c77cee4b5)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 7.7.1 eliminates this vulnerability. Applying the patch f9ec7002cdd526ae84fbacbf153162e118f22580 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at Tenable (211098). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Name

Heimdal

Version

License

open-source

Website

Product: https://github.com/heimdal/heimdal/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.5
VulDB Meta Temp Score: 5.4

VulDB Base Score: 3.5
VulDB Temp Score: 3.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 211098
Nessus Name: Fedora 37 : heimdal (2022-2c77cee4b5)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Heimdal 7.7.1
Patch: f9ec7002cdd526ae84fbacbf153162e118f22580

Timelineinfo

12/08/2021 🔍
12/26/2022 +383 days 🔍
12/26/2022 +0 days 🔍
04/15/2025 +841 days 🔍

Sourcesinfo

Product: github.com

Advisory: GHSA-69h9-669w-88xv
Status: Confirmed

CVE: CVE-2021-44758 (🔍)
GCVE (CVE): GCVE-0-2021-44758
GCVE (VulDB): GCVE-100-216786

Entryinfo

Created: 12/26/2022 07:58
Updated: 04/15/2025 02:05
Changes: 12/26/2022 07:58 (43), 01/24/2023 12:17 (11), 11/17/2024 07:13 (17), 04/15/2025 02:05 (1)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.