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MitreCVE-2017-9478

HistoryJul 31, 2017 - 3:29 a.m.

CVE-2017-9478

2017-07-3103:29:00

CWE-200

mitre

web.nvd.nist.gov

cve-2017-9478

comcast firmware

cisco dpc3939

remote attackers

hidden wi-fi networks

CVSS2

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

NONE

AV:N/AC:L/Au:N/C:P/I:N/A:N

CVSS3

7.5

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

NONE

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

AI Score

7.5

Confidence

High

EPSS

0.007

Percentile

80.6%

JSON

The Comcast firmware on Cisco DPC3939 (firmware version dpc3939-P20-18-v303r20421733-160420a-CMCST) and DPC3939 (firmware version dpc3939-P20-18-v303r20421746-170221a-CMCST) devices sets the CM MAC address to a value with a two-byte offset from the MTA/VoIP MAC address, which indirectly allows remote attackers to discover hidden Home Security Wi-Fi networks by leveraging the embedding of the MTA/VoIP MAC address into the DNS hostname.

Affected configurations

Nvd

Node

ciscodpc3939_firmwareMatchdpc3939-p20-18-v303r20421746-170221a-cmcst

AND

ciscodpc3939Match-

Node

ciscodpc3939_firmwareMatchdpc3939-p20-18-v303r20421733-160420a-cmcst

AND

ciscodpc3939Match-

VendorProductVersionCPE
ciscodpc3939_firmwaredpc3939-p20-18-v303r20421746-170221a-cmcstcpe:2.3:o:cisco:dpc3939_firmware:dpc3939-p20-18-v303r20421746-170221a-cmcst:*:*:*:*:*:*:*
ciscodpc3939-cpe:2.3:h:cisco:dpc3939:-:*:*:*:*:*:*:*
ciscodpc3939_firmwaredpc3939-p20-18-v303r20421733-160420a-cmcstcpe:2.3:o:cisco:dpc3939_firmware:dpc3939-p20-18-v303r20421733-160420a-cmcst:*:*:*:*:*:*:*

Vendor	Product	Version	CPE
cisco	dpc3939_firmware	dpc3939-p20-18-v303r20421746-170221a-cmcst	cpe:2.3:o:cisco:dpc3939_firmware:dpc3939-p20-18-v303r20421746-170221a-cmcst:::::::*
cisco	dpc3939	-	cpe:2.3:h:cisco:dpc3939:-:::::::*
cisco	dpc3939_firmware	dpc3939-p20-18-v303r20421733-160420a-cmcst	cpe:2.3:o:cisco:dpc3939_firmware:dpc3939-p20-18-v303r20421733-160420a-cmcst:::::::*

References

github.com/BastilleResearch/CableTap/blob/master/doc/advisories/bastille-20.emta-reverse-dns.txt

CVSS2

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

NONE

AV:N/AC:L/Au:N/C:P/I:N/A:N

CVSS3

7.5

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

NONE

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

AI Score

7.5

Confidence

High

EPSS

0.007

Percentile

80.6%

JSON

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