Vulnerability Report

CVE-2021-27217

Title: Yubico Yubihsm-Shell Memory Corruption

Memory Corruption

Proof Of Concept

No public PoC currently indexed for CVE-2021-27217.

CWE Category CWE-125

Published Date Mar 04, 2021

Modified Date Nov 21, 2024

Exploit Status Not Found

Score 4.4 CVSS v3.1

Exploit Probability (EPSS)

1.59%

Vulnerability Summary

CVE-2021-27217: An issue was discovered in the _send_secure_msg() function of Yubico yubihsm-shell through 2.0.3. The function does not correctly validate the embedded length field of an authenticated message received from the device. Out-of-bounds reads performed by aes_remove_padding() can crash the running process, depending on the memory layout. This could be used by an attacker to cause a client-side denial of service. The yubihsm-shell project is included in the YubiHSM 2 SDK product.

Impacted Vendors

yubico 1

Reference Links

https://blog.inhq.net/posts/yubico-libyubihsm-vuln2 https://github.com/Yubico/yubihsm-shell/releases https://www.yubico.com/support/security-advisories/ysa-2021-01/ https://blog.inhq.net/posts/yubico-libyubihsm-vuln2 https://github.com/Yubico/yubihsm-shell/releases https://www.yubico.com/support/security-advisories/ysa-2021-01/

CVSS v3.1

Source Entity [email protected]

Severity MEDIUM

4.4

Attack Vector

NETWORK

Complexity

HIGH

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

RAW VECTOR CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H

CVSS v2.0

Source Entity [email protected]

Severity LOW

3.5

Access Vector

N/A

Authentication

N/A

RAW VECTOR AV:N/AC:M/Au:S/C:N/I:N/A:P

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2021-27217 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

November 21, 2024 MODIFIED

Vulnerability data or affected products updated.

March 04, 2021 PUBLISHED

Vulnerability first announced in NVD.

Attack Vector Matrix

Access Vector NETWORK

Complexity HIGH

Privileges N/A

Interaction NONE

CVSS Vector String


                                    CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H

Affected Stack

No specific products linked.