CVE-2021-28041 : ssh-agent in OpenSSH before 8.5 has a double free that may be relevant in a few

ssh-agent in OpenSSH before 8.5 has a double free that may be relevant in a few less-common scenarios, such as unconstrained agent-socket access on a legacy operating system, or the forwarding of an agent to an attacker-controlled host.

Published 2021-03-05 21:15:13

Updated 2022-05-20 20:47:47

Source MITRE

View at NVD, CVE.org

Vulnerability category: Memory Corruption

Products affected by CVE-2021-28041

Oracle » Zfs Storage Appliance » Version: 8.8
cpe:2.3:o:oracle:zfs_storage_appliance:8.8:*:*:*:*:*:*:*
Matching versions
Oracle » Communications Offline Mediation Controller » Version: 12.0.0.3.0
cpe:2.3:a:oracle:communications_offline_mediation_controller:12.0.0.3.0:*:*:*:*:*:*:*
Matching versions
Openbsd » Openssh
Versions from including (>=) 8.2 and before (<) 8.5
cpe:2.3:a:openbsd:openssh:*:*:*:*:*:*:*:*
Matching versions
Fedoraproject » Fedora » Version: 33
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
Matching versions
Fedoraproject » Fedora » Version: 34
cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
Matching versions
Netapp » Cloud Backup » Version: N/A
cpe:2.3:a:netapp:cloud_backup:-:*:*:*:*:*:*:*
Matching versions
Netapp » Hci Management Node » Version: N/A
cpe:2.3:a:netapp:hci_management_node:-:*:*:*:*:*:*:*
Matching versions
Netapp » Solidfire » Version: N/A
cpe:2.3:a:netapp:solidfire:-:*:*:*:*:*:*:*
Matching versions
Netapp » Hci Compute Node Firmware » Version: N/A
cpe:2.3:o:netapp:hci_compute_node_firmware:-:*:*:*:*:*:*:*
Matching versions
When used together with: Netapp » Hci Compute Node » Version: N/A
Netapp » Hci Storage Node Firmware » Version: N/A
cpe:2.3:o:netapp:hci_storage_node_firmware:-:*:*:*:*:*:*:*
Matching versions
When used together with: Netapp » Hci Storage Node » Version: N/A

Threat overview for CVE-2021-28041

Top countries where our scanners detected CVE-2021-28041

Top open port discovered on systems with this issue 22

IPs affected by CVE-2021-28041 15,427,533

Threat actors abusing to this issue? Yes

Find out if you^* are affected by CVE-2021-28041!

^*Directly or indirectly through your vendors, service providers and 3rd parties. Powered by attack surface intelligence from SecurityScorecard.

Exploit prediction scoring system (EPSS) score for CVE-2021-28041

EPSS FAQ

0.18%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 56 %

Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2021-28041

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
4.6	MEDIUM	AV:N/AC:H/Au:S/C:P/I:P/A:P	3.9	6.4	NIST
Access Vector: Network Access Complexity: High Authentication: Single Confidentiality Impact: Partial Integrity Impact: Partial Availability Impact: Partial
7.1	HIGH	CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H	1.2	5.9	NIST
Attack Vector: Network Attack Complexity: High Privileges Required: Low User Interaction: Required Scope: Unchanged Confidentiality: High Integrity: High Availability: High

CWE ids for CVE-2021-28041

CWE-415 Double Free

The product calls free() twice on the same memory address, potentially leading to modification of unexpected memory locations.

Assigned by: nvd@nist.gov (Primary)

References for CVE-2021-28041

https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TXST2CML2MWY3PNVUXX7FFJE3ATJMNVZ/

Third Party Advisory
https://security.netapp.com/advisory/ntap-20210416-0002/

CVE-2021-28041 OpenSSH Vulnerability in NetApp Products | NetApp Product Security
Third Party Advisory
https://www.oracle.com//security-alerts/cpujul2021.html

Oracle Critical Patch Update Advisory - July 2021
Third Party Advisory

CVEs referencing this url
https://www.openssh.com/txt/release-8.5

Release Notes;Vendor Advisory
https://github.com/openssh/openssh-portable/commit/e04fd6dde16de1cdc5a4d9946397ff60d96568db

upstream: factor SSH_AGENT_CONSTRAIN_EXTENSION parsing into its own · openssh/openssh-portable@e04fd6d · GitHub
Patch;Third Party Advisory
https://www.openssh.com/security.html

OpenSSH: Security
Not Applicable;Vendor Advisory

CVEs referencing this url
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/KQWGII3LQR4AOTPPFXGMTYE7UDEWIUKI/

[SECURITY] Fedora 33 Update: openssh-8.4p1-7.fc33 - package-announce - Fedora Mailing-Lists
Mailing List;Third Party Advisory
https://security.gentoo.org/glsa/202105-35

OpenSSH: Multiple vulnerabilities (GLSA 202105-35) — Gentoo security
Third Party Advisory

CVEs referencing this url
https://www.openwall.com/lists/oss-security/2021/03/03/1

oss-security - Announce: OpenSSH 8.5 released
Mailing List;Patch;Third Party Advisory