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Vigil@nce - OpenSSL: information disclosure via X509_ATTRIBUTE

February 2016 by Vigil@nce

This bulletin was written by Vigil@nce : http://vigilance.fr/offer

SYNTHESIS OF THE VULNERABILITY

An attacker can read a memory fragment via X509_ATTRIBUTE of
OpenSSL processing PKCS#7 or CMS data, in order to obtain
sensitive information.

Impacted products: ProxyAV, ProxySG, SGOS, Cisco ASR, Cisco ATA,
Cisco AnyConnect Secure Mobility Client, ASA, AsyncOS, Cisco
Content SMA, Cisco ESA, Cisco Nexus, NX-OS, Cisco Prime Access
Registrar, Prime Collaboration Assurance, Cisco Prime DCNM, Prime
Infrastructure, Cisco PRSM, Secure ACS, Cisco CUCM, Cisco
MeetingPlace, Cisco WSA, Cisco Wireless Controller, Debian, BIG-IP
Hardware, TMOS, Fedora, FortiAnalyzer, FortiAnalyzer Virtual
Appliance, FortiClient, FortiGate, FortiGate Virtual Appliance,
FortiManager, FortiManager Virtual Appliance, FortiOS, FreeBSD,
AIX, IRAD, IVE OS, MAG Series Juniper, Juniper SA, Juniper SBR,
Data ONTAP, OpenBSD, OpenSSL, openSUSE, openSUSE Leap, Solaris,
pfSense, Pulse Connect Secure, MAG Series Pulse Secure, Pulse
Secure SBR, Puppet, RHEL, Slackware, stunnel, Synology DS***,
Synology RS***, Ubuntu, Unix (platform) not comprehensive.

Severity: 2/4.

Creation date: 03/12/2015.

DESCRIPTION OF THE VULNERABILITY

The OpenSSL library supports the PKCS#7 and CMS formats.

However, if an X509_ATTRIBUTE structure is malformed, OpenSSL does
not initialize a memory area before returning it to the user
reading PKCS#7 or CMS data.

It can be noted that SSL/TLS is not impacted.

An attacker can therefore read a memory fragment via
X509_ATTRIBUTE of OpenSSL processing PKCS#7 or CMS data, in order
to obtain sensitive information.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

http://vigilance.fr/vulnerability/OpenSSL-information-disclosure-via-X509-ATTRIBUTE-18436


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