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vulnerability CVE-2016-2182

OpenSSL: memory corruption via BN_bn2dec

Synthesis of the vulnerability

An attacker can generate a memory corruption via BN_bn2dec() of OpenSSL, in order to trigger a denial of service, and possibly to run code.
Vulnerable products: Blue Coat CAS, ProxyAV, ProxySG par Blue Coat, SGOS by Blue Coat, Cisco ASR, Cisco Aironet, Cisco ATA, Cisco AnyConnect Secure Mobility Client, Cisco ACE, ASA, AsyncOS, Cisco Catalyst, Cisco Content SMA, Cisco ESA, IOS by Cisco, IOS XE Cisco, IOS XR Cisco, Cisco IPS, Nexus by Cisco, NX-OS, Cisco Prime Access Registrar, Prime Collaboration Assurance, Cisco Prime DCNM, Prime Infrastructure, Cisco Prime LMS, Cisco Router, Secure ACS, Cisco CUCM, Cisco Manager Attendant Console, Cisco Unified CCX, Cisco IP Phone, Cisco MeetingPlace, Cisco Wireless IP Phone, Cisco WSA, Cisco Wireless Controller, Debian, BIG-IP Hardware, TMOS, Fedora, FileZilla Server, FortiAnalyzer, FortiAnalyzer Virtual Appliance, FortiGate, FortiGate Virtual Appliance, FortiOS, FreeBSD, FreeRADIUS, Android OS, hMailServer, HP Switch, AIX, DB2 UDB, QRadar SIEM, Tivoli Storage Manager, Tivoli Workload Scheduler, WebSphere MQ, Juniper J-Series, Junos OS, Junos Space, NSM Central Manager, NSMXpress, McAfee Email Gateway, ePO, NetScreen Firewall, ScreenOS, Nodejs Core, OpenSSL, openSUSE, openSUSE Leap, Oracle Communications, Oracle Directory Server, Oracle Directory Services Plus, Oracle Fusion Middleware, Oracle GlassFish Server, Oracle Identity Management, Oracle iPlanet Web Server, Solaris, Tuxedo, WebLogic, Oracle Web Tier, pfSense, Pulse Connect Secure, Pulse Secure Client, Pulse Secure SBR, RHEL, SAS Add-in for Microsoft Office, SAS Analytics Pro, Base SAS Software, SAS Enterprise BI Server, SAS Enterprise Guide, SAS Management Console, SAS OLAP Server, SAS SAS/ACCESS, SAS SAS/AF, SAS SAS/CONNECT, SAS SAS/EIS, SAS SAS/ETS, SAS SAS/FSP, SAS SAS/GRAPH, SAS SAS/IML, SAS SAS/OR, SAS SAS/STAT, SAS SAS/Web Report Studio, Slackware, Splunk Enterprise, stunnel, SUSE Linux Enterprise Desktop, SLES, Synology DS***, Synology RS***, Nessus, Ubuntu, WinSCP.
Severity of this weakness: 2/4.
Consequences of an attack: user access/rights, denial of service on service, denial of service on client.
Hacker's origin: document.
Creation date: 24/08/2016.
Références of this bulletin: 1996096, 1999395, 1999421, 1999474, 1999478, 1999479, 1999488, 1999532, 2000095, 2000209, 2002870, 2003480, 2003620, 2003673, 2008828, bulletinapr2017, bulletinjul2016, CERTFR-2016-AVI-333, cisco-sa-20160927-openssl, cpuapr2017, cpujan2018, cpuoct2017, CVE-2016-2182, DLA-637-1, DSA-3673-1, DSA-3673-2, FEDORA-2016-97454404fe, FEDORA-2016-a555159613, FG-IR-16-047, FG-IR-16-048, FG-IR-17-127, FreeBSD-SA-16:26.openssl, HPESBHF03856, JSA10759, K01276005, openSUSE-SU-2016:2391-1, openSUSE-SU-2016:2407-1, openSUSE-SU-2016:2537-1, openSUSE-SU-2018:0458-1, RHSA-2016:1940-01, SA132, SA40312, SB10171, SB10215, SOL01276005, SP-CAAAPUE, SPL-129207, SSA:2016-266-01, SUSE-SU-2016:2387-1, SUSE-SU-2016:2394-1, SUSE-SU-2016:2458-1, SUSE-SU-2016:2468-1, SUSE-SU-2016:2469-1, TNS-2016-16, USN-3087-1, USN-3087-2, VIGILANCE-VUL-20460.

Description of the vulnerability

The OpenSSL library works on large numbers to perform operations such are RSA.

The BN_bn2dec() function converts a large number to its decimal representation. However, a special number forces BN_div_word() to return a limit value, then data are written after the end of the memory area.

An attacker can therefore generate a memory corruption via BN_bn2dec() of OpenSSL, in order to trigger a denial of service, and possibly to run code.
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