CVE-2015-5334

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 3.5% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2020-01-23 · updated 2026-06-17
Weakness: CWE-787

Description

Off-by-one error in the OBJ_obj2txt function in LibreSSL before 2.3.1 allows remote attackers to cause a denial of service (program crash) or possible execute arbitrary code via a crafted X.509 certificate, which triggers a stack-based buffer overflow. Note: this vulnerability exists because of an incorrect fix for CVE-2014-3508.

Affected products

OpenBSD Libressl: before 2.3.1 — fixed in 2.3.1
Opensuse: 13.2

How to fix

Upgrade to a fixed version: OpenBSD Libressl 2.3.1. Check the vendor advisory for mitigations.

References

http://ftp.openbsd.org/pub/OpenBSD/LibreSSL/libressl-2.3.1-relnotes.txt
http://lists.opensuse.org/opensuse-updates/2015-10/msg00050.html
http://packetstormsecurity.com/files/133998/Qualys-Security-Advisory-LibreSSL-Leak-Overflow.html
http://seclists.org/fulldisclosure/2015/Oct/75
http://www.securityfocus.com/archive/1/archive/1/536692/100/0/threaded
http://ftp.openbsd.org/pub/OpenBSD/LibreSSL/libressl-2.3.1-relnotes.txt
http://lists.opensuse.org/opensuse-updates/2015-10/msg00050.html
http://packetstormsecurity.com/files/133998/Qualys-Security-Advisory-LibreSSL-Leak-Overflow.html
http://seclists.org/fulldisclosure/2015/Oct/75
http://www.securityfocus.com/archive/1/archive/1/536692/100/0/threaded

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