PT-2021-20813 · Libtpms · Libtpms

Fishilicoo · Published 2021-04-19 · Updated 2022-09-23 · CVE-2021-3505

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions: libtpms versions prior to 0.8.0

Description: A flaw was found in the TPM 2 implementation of libtpms, where it returns 2048 bit keys with approximately 1984 bit strength due to a bug in the TCG specification. The issue lies in the key creation algorithm, specifically in the RsaAdjustPrimeCandidate() function, which is called before the prime number check. This poses a significant threat to data confidentiality.

Recommendations: For versions prior to 0.8.0, update to version 0.8.0 or later to resolve the issue.

Exploit

Fix

Weakness Enumeration

CWE-331

Related Identifiers

CVE-2021-3505

MGASA-2021-0590

OESA-2022-1959

OPENSUSE-SU-2024:11004-1

Affected Products

Libtpms

References · 20

• 🔥 https://github.com/stefanberger/libtpms/issues/183 · Exploit
• https://bugzilla.redhat.com/show_bug.cgi?id=1950046 · Patch
• https://lists.fedoraproject.org/archives/list/[e-mail]/thread/7UCZ7AV2UKWYYCNZ2NLLXW7QYCX7K337 · Vendor Advisory
• https://lists.fedoraproject.org/archives/list/[e-mail]/message/NUCZX4S53TUNTSGTCRDNOQZV2V2RI4RJ · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-3505 · Security Note
• https://lists.fedoraproject.org/archives/list/[e-mail]/thread/DZI42OR3JUEGWRKEVCOHL2FPTJVYCYBT · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2021-3505 · Vendor Advisory
• https://advisories.mageia.org/MGASA-2021-0590.html · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2021-3505 · Vendor Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NUCZX4S53TUNTSGTCRDNOQZV2V2RI4RJ · Vendor Advisory
• https://lists.fedoraproject.org/archives/list/[e-mail]/thread/Z7KZSYMTE7Z4BBEZUWO2DIMQDWMGEP46 · Vendor Advisory
• https://osv.dev/vulnerability/MGASA-2021-0590 · Vendor Advisory
• https://lists.fedoraproject.org/archives/list/[e-mail]/thread/46YMIRHQHNKPCVNRVW4W27MFQQU7ZHHV · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-3505 · Vendor Advisory
• https://lists.fedoraproject.org/archives/list/[e-mail]/thread/7E3B6T5RBDKAWETDTW3WPORY3NK5IR46 · Vendor Advisory