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Computer vulnerabilities of FortiClient

computer vulnerability bulletin CVE-2015-4077 CVE-2015-5735 CVE-2015-5736

Fortinet FortiClient: four vulnerabilities

Synthesis of the vulnerability

An attacker can use several vulnerabilities of Fortinet FortiClient.
Impacted products: FortiClient.
Severity: 2/4.
Creation date: 02/09/2015.
Revision date: 27/03/2017.
Identifiers: CORE-2015-0013, CVE-2015-4077, CVE-2015-5735, CVE-2015-5736, CVE-2015-5737, VIGILANCE-VUL-17788.

Description of the vulnerability

Several vulnerabilities were announced in Fortinet FortiClient.

An attacker can use the IOCTL 0x22608C of "mdare*_*.sys", to read a memory fragment, in order to obtain sensitive information. [severity:1/4; CVE-2015-4077]

An attacker can use the IOCTL 0x226108 of "mdare*_*.sys", to generate a memory corruption, in order to trigger a denial of service, and possibly to run code. [severity:2/4; CVE-2015-5735]

An attacker can use the IOCTL 0x220024/0x220028 of "Fortishield.sys", to change a callback, in order to run code. [severity:2/4; CVE-2015-5736]

An attacker can use the IOCTL 0x2220c8, to access to a privileged handle, in order to escalate his privileges. [severity:2/4; CVE-2015-5737]
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vulnerability note 20584

FortiClient: disclosure of VPN password

Synthesis of the vulnerability

A local attacker can dump the memory of FortiClient, in order to obtain the VPN password.
Impacted products: FortiClient.
Severity: 2/4.
Creation date: 13/09/2016.
Identifiers: FG-IR-16-021, VIGILANCE-VUL-20584.

Description of the vulnerability

The FortiClient product can be used to connect to a VPN service, so it requests a password to access to the VPN.

However, this password is stored unencrypted in the memory.

A local attacker can therefore dump the memory of FortiClient, in order to obtain the VPN password.
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computer vulnerability bulletin CVE-2016-2542

Flexera InstallShield, JRSoft Inno Setup: code execution via DLL-planting

Synthesis of the vulnerability

An attacker can create a malicious DLL for Flexera InstallShield or JRSoft Inno Setup, in order to run code with administrator privileges.
Impacted products: NetWorker, FortiClient, DB2 UDB, Tivoli Storage Manager, WebSphere MQ, Notes, X2GoClient.
Severity: 3/4.
Creation date: 09/05/2016.
Revisions dates: 02/06/2016, 06/07/2016.
Identifiers: 1610582, 1978168, 1978363, 1979808, 1980839, 1982467, 1982741, 1982809, 1983796, 1983797, 1983813, 1983814, 1983815, 1984184, 1984743, 1984863, 494999, CVE-2016-2542, ESA-2017-008, FG-IR-16-046, VIGILANCE-VUL-19558.

Description of the vulnerability

The products Flexera InstallShield and JRSoft Inno Setup are used to create installation program for software packages.

In some cases, the generated programs load extension modules the name and possible locations depend on the considered package. However, in some cases, the installer looks for these extension DLL in folders which are writeable by unprivileged users, while the installation program that loads and run this DLL is expected to be run by an administrator. A typical case of this is the download folder of a browser. One should note that these installers are expected to be run only a few times, so possibilities of exploit attempts are rare.

This bug has also been reported for other products in the bulletin VIGILANCE-VUL-18671.

An attacker can therefore create a malicious DLL for Flexera InstallShield or JRSoft Inno Setup, in order to run code with administrator privileges.
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vulnerability CVE-2016-0723

Linux kernel: use after free via TIOCGETD

Synthesis of the vulnerability

An attacker can force the usage of a freed memory area via TIOCGETD on the Linux kernel, in order to trigger a denial of service.
Impacted products: Debian, BIG-IP Hardware, TMOS, Fedora, FortiClient, FortiOS, Android OS, Linux, openSUSE, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES, Ubuntu.
Severity: 1/4.
Creation date: 19/01/2016.
Identifiers: CERTFR-2016-AVI-070, CERTFR-2016-AVI-073, CERTFR-2016-AVI-082, CERTFR-2016-AVI-099, CERTFR-2016-AVI-103, CERTFR-2016-AVI-110, CERTFR-2016-AVI-114, CERTFR-2016-AVI-159, CVE-2016-0723, DSA-3448-1, DSA-3503-1, FEDORA-2016-2f25d12c51, FEDORA-2016-5d43766e33, FG-IR-16-013, FG-IR-16-041, openSUSE-SU-2016:0537-1, openSUSE-SU-2016:1008-1, openSUSE-SU-2016:2649-1, SOL43650115, SUSE-SU-2016:0585-1, SUSE-SU-2016:0785-1, SUSE-SU-2016:0911-1, SUSE-SU-2016:1102-1, SUSE-SU-2016:1203-1, SUSE-SU-2016:1764-1, SUSE-SU-2016:2074-1, USN-2929-1, USN-2929-2, USN-2930-1, USN-2930-2, USN-2930-3, USN-2932-1, USN-2948-1, USN-2948-2, USN-2967-1, USN-2967-2, VIGILANCE-VUL-18750.

Description of the vulnerability

The TIOCGETD returns the "Line Discipline" of the tty terminal.

However, the function implementing this ioctl frees a memory area before reusing it.

An attacker can therefore force the usage of a freed memory area via TIOCGETD on the Linux kernel, in order to trigger a denial of service.
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computer vulnerability announce CVE-2015-3196

OpenSSL: use after free via PSK Identify Hint

Synthesis of the vulnerability

An attacker can force the usage of a freed memory area via PSK Identify Hint of an OpenSSL multi-threaded client, in order to trigger a denial of service, and possibly to run code.
Impacted products: FabricOS, Brocade Network Advisor, Brocade vTM, Cisco ASR, Cisco ATA, Cisco AnyConnect Secure Mobility Client, ASA, AsyncOS, Cisco Content SMA, Cisco ESA, Nexus by Cisco, 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, HP Switch, AIX, IRAD, QRadar SIEM, Tivoli Storage Manager, Tivoli Workload Scheduler, IVE OS, Juniper J-Series, Junos OS, Junos Space, MAG Series by Juniper, NSM Central Manager, NSMXpress, Juniper SA, Juniper SBR, McAfee Email Gateway, Data ONTAP, NetScreen Firewall, ScreenOS, OpenSSL, openSUSE, openSUSE Leap, Oracle Communications, Solaris, pfSense, Pulse Connect Secure, MAG Series by Pulse Secure, Pulse Secure SBR, Puppet, RHEL, Slackware, Synology DS***, Synology RS***, Ubuntu.
Severity: 2/4.
Creation date: 03/12/2015.
Identifiers: 1972951, 1976113, 1976148, 1981612, 2003480, 2003620, 2003673, 9010051, BSA-2016-006, bulletinjan2016, c05398322, CERTFR-2015-AVI-517, cisco-sa-20151204-openssl, cpuoct2017, CVE-2015-3196, DSA-3413-1, FEDORA-2015-d87d60b9a9, FreeBSD-SA-15:26.openssl, HPESBHF03709, JSA10759, NTAP-20151207-0001, openSUSE-SU-2015:2288-1, openSUSE-SU-2015:2289-1, RHSA-2015:2617-01, SA40100, SB10203, SOL12824341, SOL30714460, SOL55540723, SOL86772626, SSA:2015-349-04, USN-2830-1, VIGILANCE-VUL-18437.

Description of the vulnerability

The OpenSSL library can be used by a multi-threaded client.

However, in this case, the SSL_CTX structure does not contain an updated PSK Identify Hint. OpenSSL can thus free twice the same memory area.

An attacker can therefore force the usage of a freed memory area via PSK Identify Hint of an OpenSSL multi-threaded client, in order to trigger a denial of service, and possibly to run code.
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computer vulnerability alert CVE-2015-3195

OpenSSL: information disclosure via X509_ATTRIBUTE

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: Tomcat, ProxyAV, ProxySG par Blue Coat, SGOS by Blue Coat, FabricOS, Brocade Network Advisor, Brocade vTM, Cisco ASR, Cisco ATA, Cisco AnyConnect Secure Mobility Client, ASA, AsyncOS, Cisco Content SMA, Cisco ESA, Nexus by Cisco, 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, HP Switch, AIX, IRAD, QRadar SIEM, Tivoli Storage Manager, IVE OS, Juniper J-Series, Junos OS, Junos Space, MAG Series by Juniper, NSM Central Manager, NSMXpress, Juniper SA, Juniper SBR, MariaDB ~ precise, McAfee Email Gateway, MySQL Enterprise, Data ONTAP, NetScreen Firewall, ScreenOS, OpenBSD, OpenSSL, openSUSE, openSUSE Leap, Oracle Communications, Solaris, Palo Alto Firewall PA***, PAN-OS, pfSense, Pulse Connect Secure, MAG Series by Pulse Secure, Pulse Secure SBR, Puppet, RHEL, JBoss EAP by Red Hat, Slackware, stunnel, SUSE Linux Enterprise Desktop, SLES, Synology DS***, Synology RS***, Ubuntu, Unix (platform) ~ not comprehensive.
Severity: 2/4.
Creation date: 03/12/2015.
Identifiers: 1972951, 1976113, 1976148, 1985739, 2003480, 2003620, 2003673, 9010051, BSA-2016-006, bulletinjan2016, c05398322, CERTFR-2015-AVI-517, CERTFR-2016-AVI-128, cisco-sa-20151204-openssl, cpuapr2017, cpuoct2016, cpuoct2017, CVE-2015-3195, DSA-3413-1, FEDORA-2015-605de37b7f, FEDORA-2015-d87d60b9a9, FreeBSD-SA-15:26.openssl, HPESBHF03709, JSA10733, JSA10759, NTAP-20151207-0001, openSUSE-SU-2015:2288-1, openSUSE-SU-2015:2289-1, openSUSE-SU-2015:2318-1, openSUSE-SU-2015:2349-1, openSUSE-SU-2016:0637-1, openSUSE-SU-2016:0640-1, openSUSE-SU-2016:1327-1, PAN-SA-2016-0020, PAN-SA-2016-0028, RHSA-2015:2616-01, RHSA-2015:2617-01, RHSA-2016:2054-01, RHSA-2016:2055-01, RHSA-2016:2056-01, SA105, SA40100, SB10203, SOL12824341, SOL30714460, SOL55540723, SOL86772626, SSA:2015-349-04, SUSE-SU-2016:0678-1, USN-2830-1, VIGILANCE-VUL-18436.

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.
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computer vulnerability CVE-2015-3194

OpenSSL: NULL pointer dereference via Certificate Verification

Synthesis of the vulnerability

An attacker can force a NULL pointer to be dereferenced during the certificate verification of OpenSSL (in client or server mode), in order to trigger a denial of service.
Impacted products: SES, SNS, Tomcat, ProxyAV, ProxySG par Blue Coat, SGOS by Blue Coat, FabricOS, Brocade Network Advisor, Brocade vTM, Cisco ASR, Cisco ATA, Cisco AnyConnect Secure Mobility Client, ASA, AsyncOS, Cisco Content SMA, Cisco ESA, Nexus by Cisco, 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, HP Switch, AIX, IRAD, QRadar SIEM, Tivoli Storage Manager, WebSphere MQ, IVE OS, Juniper J-Series, Junos OS, Junos Space, MAG Series by Juniper, NSM Central Manager, NSMXpress, Juniper SA, Juniper SBR, MariaDB ~ precise, McAfee Email Gateway, MySQL Enterprise, Data ONTAP, NETASQ, NetScreen Firewall, ScreenOS, OpenBSD, OpenSSL, openSUSE, openSUSE Leap, Oracle Communications, Solaris, pfSense, Pulse Connect Secure, MAG Series by 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.
Identifiers: 1972951, 1976113, 1976148, 1985739, 1986593, 2003480, 2003620, 2003673, 9010051, BSA-2016-006, bulletinjan2016, c05398322, CERTFR-2015-AVI-517, cisco-sa-20151204-openssl, cpuoct2017, CVE-2015-3194, DSA-3413-1, FEDORA-2015-605de37b7f, FEDORA-2015-d87d60b9a9, FreeBSD-SA-15:26.openssl, HPESBHF03709, JSA10759, NTAP-20151207-0001, openSUSE-SU-2015:2288-1, openSUSE-SU-2015:2289-1, openSUSE-SU-2015:2318-1, openSUSE-SU-2016:0637-1, openSUSE-SU-2016:1327-1, RHSA-2015:2617-01, SA105, SA40100, SB10203, SOL12824341, SOL30714460, SOL55540723, SOL86772626, SSA:2015-349-04, STORM-2015-017, USN-2830-1, VIGILANCE-VUL-18435.

Description of the vulnerability

The OpenSSL library can use the RSA PSS algorithm to check the validity of X.509 certificates.

However, if the "mask generation" parameter is missing during the verification of a signature in ASN.1 format, OpenSSL does not check if a pointer is NULL, before using it.

An attacker can therefore force a NULL pointer to be dereferenced during the certificate verification of OpenSSL (in client or server mode), in order to trigger a denial of service.
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vulnerability note CVE-2015-3193

OpenSSL: disclosure of DH private key via BN_mod_exp

Synthesis of the vulnerability

An attacker, with a significant amount of resources, can attack the DH algorithm, in some OpenSSL usages, in order to compute the private key.
Impacted products: Tomcat, FabricOS, Brocade Network Advisor, Brocade vTM, Cisco ASR, Cisco ATA, Cisco AnyConnect Secure Mobility Client, ASA, AsyncOS, Cisco Content SMA, Cisco ESA, Nexus by Cisco, 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, BIG-IP Hardware, TMOS, Fedora, FortiAnalyzer, FortiAnalyzer Virtual Appliance, FortiClient, FortiGate, FortiGate Virtual Appliance, FortiManager, FortiManager Virtual Appliance, FortiOS, HP Switch, IRAD, Tivoli Storage Manager, BIND, IVE OS, Juniper J-Series, Junos OS, Junos Space, MAG Series by Juniper, NSM Central Manager, NSMXpress, Juniper SA, Juniper SBR, McAfee Email Gateway, Data ONTAP, NetScreen Firewall, ScreenOS, OpenSSL, Oracle Communications, Solaris, Pulse Connect Secure, MAG Series by Pulse Secure, Pulse Secure SBR, Puppet, Slackware, stunnel, Ubuntu.
Severity: 1/4.
Creation date: 03/12/2015.
Identifiers: 1972951, 2003480, 2003620, 2003673, 9010051, BSA-2016-006, bulletinjan2018, c05398322, CERTFR-2015-AVI-517, cisco-sa-20151204-openssl, cpuoct2017, CVE-2015-3193, FEDORA-2015-605de37b7f, HPESBHF03709, JSA10759, NTAP-20151207-0001, SA40100, SB10203, SOL12824341, SOL30714460, SOL55540723, SOL86772626, SSA:2015-349-04, USN-2830-1, VIGILANCE-VUL-18434.

Description of the vulnerability

The OpenSSL library uses the BN_mod_exp() function to perform a modular exponentiation on large numbers.

However, on an x86_64 processor, the BN_mod_exp() function can generate an incorrect result during the Montgomery Squaring procedure.

An attacker, with a significant amount of resources, can therefore attack the DH algorithm, in some OpenSSL usages, in order to compute the private key.
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computer vulnerability announce CVE-2015-2323

FortiOS: Man-in-the-Middle of TLS

Synthesis of the vulnerability

An attacker can act as a Man-in-the-Middle between FortiOS and FortiGuard, in order to read or alter TLS sessions.
Impacted products: FortiAnalyzer, FortiAnalyzer Virtual Appliance, FortiClient, FortiGate, FortiGate Virtual Appliance, FortiManager, FortiManager Virtual Appliance, FortiOS.
Severity: 2/4.
Creation date: 29/07/2015.
Identifiers: CVE-2015-2323, FG-IR-15-021, VIGILANCE-VUL-17527.

Description of the vulnerability

The FortiOS product can connect to FortiGuard servers using a TLS session.

However, the TLS client of FortiOS accepts weak algorithms (anonymous, export and RC4).

An attacker can therefore act as a Man-in-the-Middle between FortiOS and FortiGuard, in order to read or alter TLS sessions.
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vulnerability note CVE-2015-7362

FortiClient SSLVPN Linux: privilege escalation via iclean.linux.sh

Synthesis of the vulnerability

A local attacker can call helper/subproc of FortiClient SSLVPN Linux on a malicious iclean.linux.sh file, in order to escalate his privileges.
Impacted products: FortiClient.
Severity: 2/4.
Creation date: 27/07/2015.
Identifiers: BID-76049, CVE-2015-7362, FG-IR-15-017, VIGILANCE-VUL-17504.

Description of the vulnerability

During the installation of the FortiClient SSLVPN client on Linux, the helper/subproc program is installed suid root.

If FortiClient is installed in a directory allowing a read+execution access (such as a home directory with mode "drwx---r-x"), then all local users can run subproc.

However, when subproc is run, it executes with root privileges the "iclean.linux.sh" (or cleanup.linux.sh) script, in the current directory.

A local attacker can therefore call helper/subproc of FortiClient SSLVPN Linux on a malicious iclean.linux.sh file, in order to escalate his privileges.
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