PT-2021-23347 · Openssl+1 · Libressl+1

Goldbinocle · Published 2021-09-23 · Updated 2023-09-16 · CVE-2021-41581

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions LibreSSL versions through 3.4.0

Description The issue is related to a stack-based buffer over-read in the x509 constraints parse mailbox function in lib/libcrypto/x509/x509 constraints.c. This occurs when the input exceeds DOMAIN PART MAX LEN, resulting in the buffer lacking '0' termination.

Recommendations For versions through 3.4.0, update to a version later than 3.4.0 to resolve the issue. As a temporary workaround, consider restricting input to prevent it from exceeding DOMAIN PART MAX LEN until a patch is available.

Exploit

Fix

Out of bounds Read

Weakness Enumeration

CWE-125

Related Identifiers

ALT-PU-2022-1067

ALT-PU-2023-4398

ALT-PU-2023-5593

CVE-2021-41581

Affected Products

Alt Linux

Libressl

References · 5

• 🔥 https://github.com/libressl-portable/openbsd/issues/126 · Exploit
• https://osv.dev/vulnerability/CVE-2021-41581 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-41581 · Security Note
• https://t.me/cibsecurity/29354 · Telegram Post
• https://t.me/cvenotify/21383 · Telegram Post