CVE-2021-32489
Last modified
CVE-2021-32489 is a medium-severity vulnerability rated 4.4/10 on the CVSS scale. 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. EPSS estimates a 0.92% chance of exploitation in the next 30 days.
Description
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.
Metrics
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Yubico | Yubihsm-Shell | <= 2.0.3 |
References
- https://blog.inhq.net/posts/yubico-libyubihsm-vuln2/#second-attack-variant-cve-pendingExploit, Third Party Advisory
- https://blog.inhq.net/posts/yubico-libyubihsm-vuln2/#second-attack-variant-cve-pendingExploit, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
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