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

This script is Copyright (C) 2015-2017 Tenable Network Security, Inc.


Synopsis :

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

Description :

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.

See also :

https://security.gentoo.org/glsa/201507-15

Solution :

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

Risk factor :

Medium / CVSS Base Score : 6.4
(CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:N)
CVSS Temporal Score : 5.6
(CVSS2#E:ND/RL:OF/RC:C)
Public Exploit Available : false

Family: Gentoo Local Security Checks

Nessus Plugin ID: 86084 ()

Bugtraq ID: 75652

CVE ID: CVE-2015-1793

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