PT-2015-3338 · Openbsd · Opensmtpd

Martin Prpič · Published 2015-10-05 · Updated 2017-11-01 · CVE-2015-7687

Positive Technologies (AI Summary)

CVSS v3.1

9.8

Critical

Base vector

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

Name of the Vulnerable Software and Affected Versions OpenSMTPD versions prior to 5.7.2

Description The issue is related to a use-after-free condition that can be exploited by remote attackers to cause a denial of service or execute arbitrary code. This is achieved through vectors involving req ca vrfy smtp and req ca vrfy mta. The vulnerability allows an attacker to potentially crash the system or execute arbitrary code.

Recommendations For versions prior to 5.7.2, update to version 5.7.2 or later to resolve the issue. As a temporary workaround, consider restricting access to the req ca vrfy smtp and req ca vrfy mta functions until a patch is available.

Exploit

Fix

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

BDU:2017-02492

CVE-2015-7687

Affected Products

Opensmtpd

References · 16

• 🔥 https://qualys.com/2015/10/02/opensmtpd-audit-report.txt · Exploit
• https://opensmtpd.org/announces/release-5.7.2.txt · Vendor Advisory
• https://bdu.fstec.ru/vul/2017-02492 · Security Note
• http://lists.fedoraproject.org/pipermail/package-announce/2015-November/170448.html · Vendor Advisory
• http://lists.fedoraproject.org/pipermail/package-announce/2015-October/169600.html · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2015-7687 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2015-7687 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2015-7687 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2015-7687 · Vendor Advisory
• https://ubuntu.com/security/CVE-2015-7687 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2015-7687 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2015-7687 · Security Note
• http://securityfocus.com/bid/76975 · Note
• https://bugzilla.redhat.com/show_bug.cgi?id=1268793 · Note
• http://openwall.com/lists/oss-security/2015/10/02/8 · Note