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[email protected]CVE-2018-20764

HistoryFeb 08, 2019 - 5:29 p.m.

CVE-2018-20764

2019-02-0817:29:00

[email protected]

web.nvd.nist.gov

cve-2018-20764

buffer overflow

helpsystems tcpcrypt

linux

boks

encrypted telnet

privilege escalation

nvd

7.5 High

CVSS2

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

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

9.8 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

9.6 High

AI Score

Confidence

High

0.003 Low

EPSS

Percentile

65.2%

JSON

A buffer overflow exists in HelpSystems tcpcrypt on Linux, used for BoKS encrypted telnet through BoKS version 6.7.1. Since tcpcrypt is setuid, exploitation leads to privilege escalation.

Affected configurations

NVD

Node

helpsystemsboksRange6.6.0–6.7.1

AND

linuxlinux_kernelMatch-

CPENameOperatorVersion
helpsystems:bokshelpsystems boksle6.7.1

CPE	Name	Operator	Version
helpsystems:boks	helpsystems boks	le	6.7.1

References

community.helpsystems.com/knowledge-base/fox-technologies/hotfix/515/

7.5 High

CVSS2

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

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

9.8 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

9.6 High

AI Score

Confidence

High

0.003 Low

EPSS

Percentile

65.2%

JSON

Related for CVE-2018-20764

nvd1 prion1 cvelist1