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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT Security Bulletin ASB-2018.0096 Multiple vulnerabilities patched in McAfee Web Gateway 19 April 2018 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: McAfee Web Gateway Operating System: Network Appliance Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated Denial of Service -- Remote/Unauthenticated Provide Misleading Information -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2018-7185 CVE-2018-7184 CVE-2018-7183 CVE-2018-7182 CVE-2018-7170 CVE-2018-5733 CVE-2018-5732 Member content until: Saturday, May 19 2018 OVERVIEW A vulnerability has been identified in the following McAfee product: McAfee Web Gateway 7.7 until and including 7.7.2.11 McAfee Web Gateway 7.8 until and including 7.8.1.3 [1] IMPACT The vendor has provided the following details regarding this issue: "CVE-2018-7170: NTPD allows authenticated users that know the private symmetric key to create arbitrarily-many ephemeral associations in order to win the clock selection of NTPD, and modify a victim's clock via a Sybil attack. https://nvd.nist.gov/vuln/detail/CVE-2018-7170 CVE-2018-7182: The ctl_getitem method in NTPD allows remote attackers to cause a denial of service (out-of-bounds read) via a crafted mode 6 packet. https://nvd.nist.gov/vuln/detail/CVE-2018-7182 CVE-2018-7183: A Buffer overflow in the decodearr function in ntpq in ntp 4.2.8p6 through 4.2.8p10 allows remote attackers to execute arbitrary code, by leveraging an ntpq query and sending a response with a crafted array. https://nvd.nist.gov/vuln/detail/CVE-2018-7183 CVE-2018-7184: NTPD drops bad packets before updating the "received" timestamp, which allows remote attackers to cause a denial of service (disruption) by sending a packet with a zero-origin timestamp, causing the association to reset and setting the contents of the packet as the most recent timestamp. https://nvd.nist.gov/vuln/detail/CVE-2018-7184 CVE-2018-7185: The protocol engine in ntp allows a remote attacker to cause a denial of service (disruption) by continually sending a packet with a zero-origin timestamp and source IP address of the "other side" of an interleaved association causing the victim NTPD to reset its association. https://nvd.nist.gov/vuln/detail/CVE-2018-7185 CVE-2018-5732: An out-of-bound memory access flaw was found in the way dhclient processed a DHCP response packet. A malicious DHCP server could potentially use this flaw to crash dhclient processes running on DHCP client machines, via a crafted DHCP response packet. http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2018-5732 CVE-2018-5733: A denial of service flaw was found in the way DHCPD handled reference counting when processing client requests. A malicious DHCP client could use this flaw to trigger a reference count overflow on the server side, potentially causing DHCPD to crash, by sending large amounts of traffic. http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2018-5733" [1] MITIGATION The vendor recommends updating to version 7.7.2.12 or later, or 7.8.1.4 or later. [1] REFERENCES [1] McAfee Security Bulletin - Web Gateway update fixes several vulnerabilities https://kc.mcafee.com/corporate/index?page=content&id=SB10231 AusCERT has made every effort to ensure that the information contained in this document is accurate. However, the decision to use the information described is the responsibility of each user or organisation. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AusCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBWtfhaox+lLeg9Ub1AQjhJw/9H62yRkR10H2Cqk9HQP2/yjKB3YR9DRZf kFBgGHqH+0iHVHyBdO1WUnjHXEvL+BLOZaVyEfbigm3vhV96vHifdMZh6PzDsKJD 3733qjSDLwgag/ENiSwJqtUfPkR2V4aurO881bLV4Cx24LetgAhzwFYiLpKNt+h/ DuAaYLt3fP/EIhYsAWSgwK+v6LSUDTEeLo6Zt/JRqFfFtGjgNpn4f1lUhtpGukj7 ddFjyQZIIVmrjCRLVkTkaoe1QumVoHqxuEfHlZSmspWkHIbyCdIj3arSSm+DHG5b sJxtJX0/g3wLWAEzB53qTNJrlDVldmywHrzwQRFBnE3+HLB2nGB3JoOwbEu1wmmp y6MunBa834AkHmrmHvXSpTme4SXQuBPxcUEmPnCpzU/3KAqVozS5wdcZMH1puzW0 K3JRVBO0Q6ePXR5Xq/9YEjiGYKOosLv3VLFLa+7VcXynThLxO/RK510yi5g2ojRG x54ruOvCOFdoIJ42fLGjlNaO+1zALZXNsQAeI72FvXLoSnu1lKfqQZ8y2an6aM1f 0UFYTt8T6W3JIizcloebMz42W7nj//4CDnvixTJVtZBHDCCF9ABKU9dLKroRHg+9 WFB29BzC3eUDVfRK/GWgST7Tv7KjGOlGrT6z0qtkx5RBUTNoPEr5+sCWo4IKD9ym h14NGvqdriA= =12G+ -----END PGP SIGNATURE-----