Vulnerability Name:

CVE-2021-32489 (CCN-201760)

Assigned:2021-03-04
Published:2021-03-04
Updated:2021-05-19
Summary: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 because response_msg.st.len=8 can be accepted but triggers an integer overflow, which causes CRYPTO_cbc128_decrypt (in OpenSSL) to encounter an undersized buffer and experience a segmentation fault. The yubihsm-shell project is included in the YubiHSM 2 SDK product.
CVSS v3 Severity:4.4 Medium (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H)
3.9 Low (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H/E:U/RL:U/RC:R)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): High
Privileges Required (PR): High
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): High
4.4 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H)
3.9 Low (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H/E:U/RL:U/RC:R)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): High
Privileges Required (PR): High
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): High
CVSS v2 Severity:3.5 Low (CVSS v2 Vector: AV:N/AC:M/Au:S/C:N/I:N/A:P)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Medium
Authentication (Au): Single_Instance
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Partial
4.9 Medium (CCN CVSS v2 Vector: AV:N/AC:H/Au:S/C:N/I:N/A:C)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): High
Athentication (Au): Single_Instance
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Complete
Vulnerability Type:CWE-190
Vulnerability Consequences:Denial of Service
References:Source: MITRE
Type: CNA
CVE-2021-32489

Source: CCN
Type: invd Blog, Mar 4, 2021
Yubico libyubihsm?Vulnerabilities (CVE-2021-27217, CVE-2021-32489)

Source: MISC
Type: Exploit, Third Party Advisory
https://blog.inhq.net/posts/yubico-libyubihsm-vuln2/#second-attack-variant-cve-pending

Source: XF
Type: UNKNOWN
yubico-cve202132489-dos(201760)

Source: CCN
Type: Yubico Web site
Yubico | YubiKey Strong Two Factor Authentication

Vulnerable Configuration:Configuration 1:
  • cpe:/a:yubico:yubihsm-shell:*:*:*:*:*:*:*:* (Version <= 2.0.3)

    • Configuration CCN 1:
  • cpe:/a:yubico:yubihsm-shell:2.0.3:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    BACK
    yubico yubihsm-shell *
    yubico yubihsm-shell 2.0.3