The Vigil@nce team watches public vulnerabilities impacting your computers, and then offers security solutions, a database and tools to fix them.

Computer vulnerabilities of Check Point Security Gateway

vulnerability announce CVE-2013-0149

OSPF: corrupting the routing database

Synthesis of the vulnerability

An attacker can spoof OSPF messages, in order to corrupt the routing database.
Impacted products: CheckPoint IP Appliance, IPSO, CheckPoint Security Gateway, Cisco ASR, ASA, Cisco Catalyst, IOS by Cisco, IOS XE Cisco, Nexus by Cisco, NX-OS, Cisco Router, ProCurve Switch, HP Switch, Juniper E-Series, Juniper J-Series, JUNOSe, Junos OS, NetScreen Firewall, ScreenOS, SUSE Linux Enterprise Desktop, SLES.
Severity: 3/4.
Creation date: 02/08/2013.
Revisions dates: 01/08/2014, 14/02/2017.
Identifiers: BID-61566, c03880910, CERTA-2013-AVI-458, CERTA-2013-AVI-487, CERTA-2013-AVI-508, cisco-sa-20130801-lsaospf, CQ95773, CSCug34469, CSCug34485, CSCug39762, CSCug39795, CSCug63304, CVE-2013-0149, HPSBHF02912, JSA10575, JSA10580, JSA10582, PR 878639, PR 895456, sk94490, SUSE-SU-2014:0879-1, VIGILANCE-VUL-13192, VU#229804.

Description of the vulnerability

The RFC 2328 defines the OSPF protocol (Open Shortest Path First) which established IP routes, using LSA (Link State Advertisement) messages.

The LSA Type 1 Update (LSU, Link-State Update) message is used to update the routing database. However, the RFC does not request to check the "Link State ID" and "Advertising Router" fields of LSU messages. Several implementations (Cisco, Juniper, etc.) therefore do not perform this check.

An attacker can thus spoof a LSU message if he knows:
 - the IP address of the target router
 - LSA DB sequence numbers
 - the router ID of the OSPF Designated Router

An attacker can therefore spoof OSPF messages, in order to corrupt the routing database.
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vulnerability CVE-2016-4487 CVE-2016-4488 CVE-2016-4489

binutils/libiberty: seven vulnerabilities

Synthesis of the vulnerability

Several vulnerabilities were announced in binutils/libiberty.
Impacted products: GAiA, CheckPoint IP Appliance, SecurePlatform, CheckPoint Security Appliance, CheckPoint Security Gateway, Debian, Ubuntu.
Severity: 2/4.
Creation date: 18/07/2016.
Identifiers: CVE-2016-4487, CVE-2016-4488, CVE-2016-4489, CVE-2016-4490, CVE-2016-4491, CVE-2016-4492, CVE-2016-4493, DLA-552-1, sk116495, USN-3337-1, USN-3367-1, USN-3368-1, VIGILANCE-VUL-20140.

Description of the vulnerability

Several vulnerabilities were announced in binutils/libiberty.

An attacker can force the usage of a freed memory area via btypevec, in order to trigger a denial of service, and possibly to run code. [severity:2/4; CVE-2016-4487]

An attacker can force the usage of a freed memory area via ktypevec, in order to trigger a denial of service, and possibly to run code. [severity:2/4; CVE-2016-4488]

An attacker can generate an integer overflow, in order to trigger a denial of service, and possibly to run code. [severity:2/4; CVE-2016-4489]

An attacker can generate a memory corruption, in order to trigger a denial of service, and possibly to run code. [severity:2/4; CVE-2016-4490]

An attacker can generate an infinite loop via d_print_comp(), in order to trigger a denial of service. [severity:1/4; CVE-2016-4491]

An attacker can generate a memory corruption, in order to trigger a denial of service, and possibly to run code. [severity:2/4; CVE-2016-4492]

An attacker can force a read at an invalid address, in order to trigger a denial of service, or to obtain sensitive information. [severity:1/4; CVE-2016-4493]
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computer vulnerability announce 17127

Check Point Security Gateway: memory leak via CIFS

Synthesis of the vulnerability

An attacker can create a memory leak in the CIFS protocol analyser of Check Point Security Gateway, in order to trigger a denial of service.
Impacted products: SecurePlatform, CheckPoint Security Appliance, CheckPoint Security Gateway.
Severity: 2/4.
Creation date: 15/06/2015.
Identifiers: sk106334, VIGILANCE-VUL-17127.

Description of the vulnerability

The Check Point Security Gateway product offers an anti-virus service.

It may be configured to inspect the CIFS network traffic. However, the memory allocated in a function range_create() is never freed.

An attacker can therefore create a memory leak in the CIFS protocol analyzer of Check Point Security Gateway, in order to trigger a denial of service.
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computer vulnerability alert CVE-2015-4024

PHP: denial of service via multipart/form-data

Synthesis of the vulnerability

An attacker can send specially formed multipart/form-data data to PHP, in order to trigger a denial of service.
Impacted products: CheckPoint Security Gateway, Debian, BIG-IP Hardware, TMOS, Fedora, openSUSE, Solaris, PHP, RHEL, Slackware, SUSE Linux Enterprise Desktop, SLES, Synology DSM, Synology DS***, Synology RS***, Ubuntu.
Severity: 2/4.
Creation date: 18/05/2015.
Identifiers: 69364, bulletinjul2015, bulletinjul2017, CERTFR-2015-AVI-234, CVE-2015-4024, DSA-3280-1, FEDORA-2015-8370, FEDORA-2015-8383, openSUSE-SU-2015:0993-1, RHSA-2015:1135-01, RHSA-2015:1186-01, RHSA-2015:1187-01, RHSA-2015:1218-01, RHSA-2015:1219-01, sk106834, SOL16826, SSA:2015-162-02, SUSE-SU-2015:1253-1, SUSE-SU-2015:1253-2, SUSE-SU-2016:1638-1, USN-2658-1, VIGILANCE-VUL-16916.

Description of the vulnerability

The PHP product supports data in the MIME multipart format of type "form-data".

However, if the file name is on several lines, the multipart_buffer_headers() function consumes numerous resources to rebuilt it.

An attacker can therefore send specially formed multipart/form-data data to PHP, in order to trigger a denial of service.
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vulnerability CVE-2015-0235

glibc: buffer overflow of gethostbyname, GHOST

Synthesis of the vulnerability

An attacker can for example send an email using a long IPv4 address, to force the messaging server to resolve this address, and to generate a buffer overflow in gethostbyname() of the glibc, in order to trigger a denial of service, and possibly to execute code. Several programs using the gethostbyname() function are vulnerable with a similar attack vector.
Impacted products: Arkoon FAST360, GAiA, CheckPoint IP Appliance, Provider-1, SecurePlatform, CheckPoint Security Gateway, CheckPoint VSX-1, Cisco ASR, Cisco Catalyst, IOS XE Cisco, IOS XR Cisco, Nexus by Cisco, NX-OS, Prime Infrastructure, Cisco CUCM, XenServer, Clearswift Email Gateway, Debian, Unisphere EMC, VNX Operating Environment, VNX Series, Exim, BIG-IP Hardware, TMOS, HPE BSM, HP Operations, Performance Center, Junos Space, MBS, McAfee Email and Web Security, McAfee Email Gateway, McAfee MOVE AntiVirus, McAfee NSP, McAfee NTBA, McAfee NGFW, VirusScan, McAfee Web Gateway, NetIQ Sentinel, openSUSE, Oracle Communications, Palo Alto Firewall PA***, PAN-OS, PHP, HDX, RealPresence Collaboration Server, RealPresence Distributed Media Application, RealPresence Resource Manager, Polycom VBP, RHEL, SIMATIC, Slackware, SUSE Linux Enterprise Desktop, SLES, Synology DSM, Ubuntu, Unix (platform) ~ not comprehensive, WordPress Core.
Severity: 4/4.
Creation date: 27/01/2015.
Revision date: 27/01/2015.
Identifiers: 198850, 199399, c04577814, c04589512, CERTFR-2015-AVI-043, cisco-sa-20150128-ghost, cpujul2015, cpujul2017, cpuoct2016, cpuoct2017, cpuoct2018, CTX200437, CVE-2015-0235, DSA-3142-1, ESA-2015-030, ESA-2015-041, GHOST, HPSBGN03270, HPSBGN03285, JSA10671, K16057, KM01391662, MDVSA-2015:039, openSUSE-SU-2015:0162-1, openSUSE-SU-2015:0184-1, PAN-SA-2015-0002, RHSA-2015:0090-01, RHSA-2015:0092-01, RHSA-2015:0099-01, RHSA-2015:0101-01, RHSA-2015:0126-01, SB10100, sk104443, SOL16057, SSA:2015-028-01, SSA-994726, SUSE-SU-2015:0158-1, USN-2485-1, VIGILANCE-VUL-16060, VU#967332.

Description of the vulnerability

The glibc library provides two functions to obtain the IP address of a server from its DNS name:
  struct hostent *gethostbyname(const char *name);
  struct hostent *gethostbyname2(const char *name, int af);

For example:
  he = gethostbyname("www.example.com");

These functions also accept to directly process an IP address:
  he = gethostbyname("192.168.1.1");

However, a malformed IPv4 address, which is too long such as 192.168.111111.1 (more than 1024 byte long) triggers an overflow in the __nss_hostname_digits_dots() function.

An attacker can therefore for example send an email using a long IPv4 address, to force the messaging server to resolve this address, and to generate a buffer overflow in gethostbyname() of the glibc, in order to trigger a denial of service, and possibly to execute code.

Several programs using the gethostbyname() function are vulnerable (exim, php, pppd, procmail) with a similar attack vector. The following programs are apparently not vulnerable: apache, cups, dovecot, gnupg, isc-dhcp, lighttpd, mariadb/mysql, nfs-utils, nginx, nodejs, openldap, openssh, postfix, proftpd, pure-ftpd, rsyslog, samba, sendmail, squid, sysklogd, syslog-ng, tcp_wrappers, vsftpd, xinetd.
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computer vulnerability alert CVE-2014-8951

Check Point Security Gateway: denial of service via UserCheck

Synthesis of the vulnerability

An attacker can generate an error in UserCheck of Check Point Security Gateway, in order to trigger a denial of service.
Impacted products: GAiA, CheckPoint IP Appliance, IPSO, SecurePlatform, CheckPoint Security Appliance, CheckPoint Security Gateway.
Severity: 2/4.
Creation date: 17/11/2014.
Identifiers: CVE-2014-8951, sk100505, VIGILANCE-VUL-15656.

Description of the vulnerability

The UserCheck feature can be enabled on the Check Point Security Gateway product.

However, a redirect to the UserCheck page triggers a fatal error in uc_set_redirect_url().

An attacker can therefore generate an error in UserCheck of Check Point Security Gateway, in order to trigger a denial of service.
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computer vulnerability CVE-2014-8950

Check Point Security Gateway: denial of service via HTTPS

Synthesis of the vulnerability

An attacker can send a malicious HTTPS packet to Check Point Security Gateway, in order to trigger a denial of service.
Impacted products: GAiA, CheckPoint IP Appliance, IPSO, SecurePlatform, CheckPoint Security Appliance, CheckPoint Security Gateway.
Severity: 2/4.
Creation date: 17/11/2014.
Identifiers: CVE-2014-8950, sk98935, VIGILANCE-VUL-15655.

Description of the vulnerability

The URL Filtering or Identity Awareness feature can be enabled on the Check Point Security Gateway product.

However, when a malicious HTTPS packet is received, a fatal error occurs.

An attacker can therefore send a malicious HTTPS packet to Check Point Security Gateway, in order to trigger a denial of service.
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computer vulnerability CVE-2014-3566

SSL 3.0: decrypting session, POODLE

Synthesis of the vulnerability

An attacker, located as a Man-in-the-Middle, can decrypt a SSL 3.0 session, in order to obtain sensitive information.
Impacted products: SES, SNS, Apache httpd, Arkoon FAST360, ArubaOS, Asterisk Open Source, BES, ProxyAV, ProxySG par Blue Coat, SGOS by Blue Coat, GAiA, CheckPoint IP Appliance, IPSO, SecurePlatform, CheckPoint Security Appliance, CheckPoint Security Gateway, Cisco ASR, Cisco ACE, ASA, AsyncOS, Cisco CSS, Cisco ESA, IOS by Cisco, IOS XE Cisco, IOS XR Cisco, IronPort Email, Nexus by Cisco, NX-OS, Prime Infrastructure, Cisco PRSM, Cisco Router, WebNS, Clearswift Email Gateway, Clearswift Web Gateway, CUPS, Debian, Black Diamond, ExtremeXOS, Ridgeline, Summit, BIG-IP Hardware, TMOS, Fedora, FortiGate, FortiGate Virtual Appliance, FortiManager, FortiManager Virtual Appliance, FortiOS, FreeBSD, F-Secure AV, hMailServer, HPE BSM, HP Data Protector, HPE NNMi, HP Operations, ProCurve Switch, SiteScope, HP Switch, TippingPoint IPS, HP-UX, AIX, Domino, Notes, Security Directory Server, SPSS Data Collection, Tivoli System Automation, Tivoli Workload Scheduler, WebSphere AS Traditional, WebSphere MQ, WS_FTP Server, IVE OS, Juniper J-Series, Junos OS, Junos Space, Junos Space Network Management Platform, MAG Series by Juniper, NSM Central Manager, NSMXpress, Juniper SA, MBS, McAfee Email and Web Security, McAfee Email Gateway, ePO, VirusScan, McAfee Web Gateway, IE, Windows 2003, Windows 2008 R0, Windows 2008 R2, Windows 2012, Windows 7, Windows 8, Windows (platform) ~ not comprehensive, Windows RT, Windows Vista, NETASQ, NetBSD, NetIQ Sentinel, NetScreen Firewall, ScreenOS, nginx, OpenSSL, openSUSE, openSUSE Leap, Oracle DB, Oracle Fusion Middleware, Oracle Identity Management, Oracle OIT, Solaris, Tuxedo, WebLogic, Palo Alto Firewall PA***, PAN-OS, Polycom CMA, HDX, RealPresence Collaboration Server, RealPresence Distributed Media Application, Polycom VBP, Postfix, SSL protocol, Puppet, RHEL, JBoss EAP by Red Hat, RSA Authentication Manager, ROS, ROX, RuggedSwitch, Slackware, Spectracom SecureSync, Splunk Enterprise, stunnel, SUSE Linux Enterprise Desktop, SLES, Synology DSM, Ubuntu, Unix (platform) ~ not comprehensive, ESXi, vCenter Server, VMware vSphere, VMware vSphere Hypervisor, WindRiver Linux.
Severity: 3/4.
Creation date: 15/10/2014.
Identifiers: 10923, 1589583, 1595265, 1653364, 1657963, 1663874, 1687167, 1687173, 1687433, 1687604, 1687611, 1690160, 1690185, 1690342, 1691140, 1692551, 1695392, 1696383, 1699051, 1700706, 2977292, 3009008, 7036319, aid-10142014, AST-2014-011, bulletinapr2015, bulletinjan2015, bulletinjan2016, bulletinjul2015, bulletinjul2016, bulletinoct2015, c04486577, c04487990, c04492722, c04497114, c04506802, c04510230, c04567918, c04616259, c04626982, c04676133, c04776510, CERTFR-2014-ALE-007, CERTFR-2014-AVI-454, CERTFR-2014-AVI-509, CERTFR-2015-AVI-169, CERTFR-2016-AVI-303, cisco-sa-20141015-poodle, cpujul2017, CTX216642, CVE-2014-3566, DSA-3053-1, DSA-3253-1, DSA-3489-1, ESA-2014-178, ESA-2015-098, ESXi500-201502001, ESXi500-201502101-SG, ESXi510-201503001, ESXi510-201503001-SG, ESXi510-201503101-SG, ESXi550-201501001, ESXi550-201501101-SG, FEDORA-2014-12989, FEDORA-2014-12991, FEDORA-2014-13012, FEDORA-2014-13017, FEDORA-2014-13040, FEDORA-2014-13069, FEDORA-2014-13070, FEDORA-2014-13444, FEDORA-2014-13451, FEDORA-2014-13764, FEDORA-2014-13777, FEDORA-2014-13781, FEDORA-2014-13794, FEDORA-2014-14234, FEDORA-2014-14237, FEDORA-2014-15379, FEDORA-2014-15390, FEDORA-2014-15411, FEDORA-2014-17576, FEDORA-2014-17587, FEDORA-2015-9090, FEDORA-2015-9110, FreeBSD-SA-14:23.openssl, FSC-2014-8, HPSBGN03256, HPSBGN03305, HPSBGN03332, HPSBHF03156, HPSBHF03300, HPSBMU03152, HPSBMU03184, HPSBMU03213, HPSBMU03416, HPSBUX03162, HPSBUX03194, JSA10656, MDVSA-2014:203, MDVSA-2014:218, MDVSA-2015:062, NetBSD-SA2014-015, nettcp_advisory, openSUSE-SU-2014:1331-1, openSUSE-SU-2014:1384-1, openSUSE-SU-2014:1395-1, openSUSE-SU-2014:1426-1, openSUSE-SU-2016:0640-1, openSUSE-SU-2016:1586-1, openSUSE-SU-2017:0980-1, PAN-SA-2014-0005, POODLE, RHSA-2014:1652-01, RHSA-2014:1653-01, RHSA-2014:1692-01, RHSA-2014:1920-01, RHSA-2014:1948-01, RHSA-2015:0010-01, RHSA-2015:0011-01, RHSA-2015:0012-01, RHSA-2015:1545-01, RHSA-2015:1546-01, SA83, SB10090, SB10104, sk102989, SOL15702, SP-CAAANKE, SP-CAAANST, SPL-91947, SPL-91948, SSA:2014-288-01, SSA-396873, SSA-472334, SSRT101767, STORM-2014-02-FR, SUSE-SU-2014:1357-1, SUSE-SU-2014:1361-1, SUSE-SU-2014:1386-1, SUSE-SU-2014:1387-1, SUSE-SU-2014:1387-2, SUSE-SU-2014:1409-1, SUSE-SU-2015:0010-1, SUSE-SU-2016:1457-1, SUSE-SU-2016:1459-1, T1021439, TSB16540, USN-2839-1, VIGILANCE-VUL-15485, VMSA-2015-0001, VMSA-2015-0001.1, VMSA-2015-0001.2, VN-2014-003, VU#577193.

Description of the vulnerability

An SSL/TLS session can be established using several protocols:
 - SSL 2.0 (obsolete)
 - SSL 3.0
 - TLS 1.0
 - TLS 1.1
 - TLS 1.2

An attacker can downgrade the version to SSLv3. However, with SSL 3.0, an attacker can change the padding position with a CBC encryption, in order to progressively guess clear text fragments.

This vulnerability is named POODLE (Padding Oracle On Downgraded Legacy Encryption).

An attacker, located as a Man-in-the-Middle, can therefore decrypt a SSL 3.0 session, in order to obtain sensitive information.
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vulnerability note CVE-2014-0224

OpenSSL: man in the middle via ChangeCipherSpec

Synthesis of the vulnerability

An attacker can act as a man in the middle between a client and a server using OpenSSL, in order to read or alter exchanged data.
Impacted products: ArubaOS, ProxyAV, ProxySG par Blue Coat, SGOS by Blue Coat, GAiA, CheckPoint IP Appliance, IPSO, Provider-1, SecurePlatform, CheckPoint Security Appliance, CheckPoint Security Gateway, Cisco ASR, Cisco ATA, Cisco ACE, ASA, AsyncOS, Cisco Catalyst, CiscoWorks, Cisco Content SMA, Cisco CSS, Cisco ESA, IOS by Cisco, IOS XE Cisco, IOS XR Cisco, Cisco IPS, IronPort Email, IronPort Management, IronPort Web, Nexus by Cisco, NX-OS, Prime Collaboration Assurance, Prime Collaboration Manager, Prime Infrastructure, Cisco PRSM, Cisco Router, Secure ACS, Cisco CUCM, Cisco Manager Attendant Console, Cisco Unified CCX, Cisco IP Phone, Cisco MeetingPlace, Cisco Wireless IP Phone, Cisco Unity ~ precise, WebNS, Cisco WSA, MIMEsweeper, Clearswift Web Gateway, Debian, Avamar, EMC CAVA, EMC CEE, EMC CEPA, Celerra FAST, Celerra NS, Celerra NX4, EMC CMDCE, Connectrix Switch, ECC, NetWorker, PowerPath, Unisphere EMC, VNX Operating Environment, VNX Series, BIG-IP Hardware, TMOS, Fedora, FortiAnalyzer, FortiAnalyzer Virtual Appliance, FortiClient, FortiManager, FortiManager Virtual Appliance, FreeBSD, HP Operations, ProCurve Switch, HP Switch, HP-UX, AIX, Tivoli Storage Manager, WebSphere MQ, Juniper J-Series, Junos OS, Junos Pulse, Juniper Network Connect, Juniper UAC, MBS, MES, McAfee Web Gateway, MySQL Enterprise, NetBSD, OpenBSD, OpenSSL, openSUSE, openSUSE Leap, Oracle Communications, Solaris, Polycom CMA, HDX, RealPresence Collaboration Server, Polycom VBP, RHEL, JBoss EAP by Red Hat, ACE Agent, ACE Server, RSA Authentication Agent, RSA Authentication Manager, SecurID, ROS, ROX, RuggedSwitch, SIMATIC, Slackware, Splunk Enterprise, stunnel, SUSE Linux Enterprise Desktop, SLES, Nessus, InterScan Messaging Security Suite, InterScan Web Security Suite, TrendMicro ServerProtect, Ubuntu, ESXi, vCenter Server, VMware vSphere, VMware vSphere Hypervisor, Websense Email Security, Websense Web Filter, Websense Web Security.
Severity: 3/4.
Creation date: 05/06/2014.
Revision date: 05/06/2014.
Identifiers: 1676496, 1690827, aid-06062014, c04336637, c04347622, c04363613, CERTFR-2014-AVI-253, CERTFR-2014-AVI-254, CERTFR-2014-AVI-255, CERTFR-2014-AVI-260, CERTFR-2014-AVI-274, CERTFR-2014-AVI-279, CERTFR-2014-AVI-286, CERTFR-2014-AVI-513, cisco-sa-20140605-openssl, cpuoct2016, CTX140876, CVE-2014-0224, DOC-53313, DSA-2950-1, DSA-2950-2, FEDORA-2014-17576, FEDORA-2014-17587, FEDORA-2014-7101, FEDORA-2014-7102, FG-IR-14-018, FreeBSD-SA-14:14.openssl, HPSBHF03052, HPSBUX03046, JSA10629, MDVSA-2014:105, MDVSA-2014:106, MDVSA-2015:062, NetBSD-SA2014-006, openSUSE-SU-2014:0764-1, openSUSE-SU-2014:0765-1, openSUSE-SU-2015:0229-1, openSUSE-SU-2016:0640-1, RHSA-2014:0624-01, RHSA-2014:0625-01, RHSA-2014:0626-01, RHSA-2014:0627-01, RHSA-2014:0628-01, RHSA-2014:0629-01, RHSA-2014:0630-01, RHSA-2014:0631-01, RHSA-2014:0632-01, RHSA-2014:0633-01, RHSA-2014:0679-01, RHSA-2014:0680-01, SA40006, SA80, SB10075, sk101186, SOL15325, SPL-85063, SSA:2014-156-03, SSA-234763, SSRT101590, SUSE-SU-2014:0759-1, SUSE-SU-2014:0759-2, SUSE-SU-2014:0761-1, SUSE-SU-2014:0762-1, USN-2232-1, USN-2232-2, USN-2232-3, USN-2232-4, VIGILANCE-VUL-14844, VMSA-2014-0006, VMSA-2014-0006.1, VMSA-2014-0006.10, VMSA-2014-0006.11, VMSA-2014-0006.2, VMSA-2014-0006.3, VMSA-2014-0006.4, VMSA-2014-0006.5, VMSA-2014-0006.6, VMSA-2014-0006.7, VMSA-2014-0006.8, VMSA-2014-0006.9, VU#978508.

Description of the vulnerability

The OpenSSL product implements SSL/TLS, which uses a handshake.

However, by using a handshake with a ChangeCipherSpec message, an attacker can force the usage of weak keys.

An attacker can therefore act as a man in the middle between a client and a server using OpenSSL, in order to read or alter exchanged data.
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vulnerability announce CVE-2014-8952

Check Point Security Gateway: denial of service

Synthesis of the vulnerability

An attacker can send malicious packets to Check Point Security Gateway, in order to trigger a denial of service.
Impacted products: GAiA, CheckPoint IP Appliance, IPSO, SecurePlatform, CheckPoint Security Appliance, CheckPoint Security Gateway.
Severity: 3/4.
Creation date: 26/05/2014.
Identifiers: CVE-2014-8952, sk100431, VIGILANCE-VUL-14802.

Description of the vulnerability

An attacker can send malicious packets to Check Point Security Gateway, in order to trigger a denial of service.

Technical details are unknown.
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