GLSA-201507-15 : OpenSSL: Alternate chains certificate forgery

Medium Nessus Plugin ID 86084


The remote Gentoo host is missing one or more security-related patches.


The remote host is affected by the vulnerability described in GLSA-201507-15 (OpenSSL: Alternate chains certificate forgery)

During certificate verification, OpenSSL attempts to find an alternative certificate chain if the first attempt to build such a chain fails.
Impact :

A remote attacker could cause certain checks on untrusted certificates to be bypassed, such as the CA flag, enabling them to use a valid leaf certificate to act as a CA and “issue” an invalid certificate.
Workaround :

There is no known workaround at this time.


All OpenSSL users should upgrade to the latest version:
# emerge --sync # emerge --ask --oneshot --verbose '>=dev-libs/openssl-1.0.1p'

See Also

Plugin Details

Severity: Medium

ID: 86084

File Name: gentoo_GLSA-201507-15.nasl

Version: $Revision: 2.8 $

Type: local

Published: 2015/09/23

Modified: 2017/10/02

Dependencies: 12634

Risk Information

Risk Factor: Medium


Base Score: 6.4

Temporal Score: 5.6

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:N

Temporal Vector: CVSS2#E:ND/RL:OF/RC:C


Base Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Vulnerability Information

CPE: p-cpe:/a:gentoo:linux:openssl, cpe:/o:gentoo:linux

Required KB Items: Host/local_checks_enabled, Host/Gentoo/release, Host/Gentoo/qpkg-list

Exploit Available: false

Exploit Ease: No known exploits are available

Patch Publication Date: 2015/07/10

Reference Information

CVE: CVE-2015-1793

BID: 75652

GLSA: 201507-15