CVE-2021-27141

CVSS V2 Medium 5 CVSS V3 Critical 9.8

Description

An issue was discovered on FiberHome HG6245D devices through RP2613. Credentials in /fhconf/umconfig.txt are obfuscated via XOR with the hardcoded *j7a(L#yZ98sSd5HfSgGjMj8;Ss;d)(*&^#@$a2s0i3g key. (The webs binary has details on how XOR is used.)

Overview

CVE ID
CVE-2021-27141

Assigner
cve@mitre.org

Vulnerability Status
Analyzed

Published Version
2021-02-10T19:15:12

Last Modified Date
2021-02-12T01:03:21

Weakness Enumerations

CWE	URL
CWE-798	http://cwe.mitre.org/data/definitions/798.html

CPE Configuration (Product)

CPE	Vulnerable	Operator	Version End
		AND
cpe:2.3:o:fiberhome:hg6245d_firmware::::::::	1	OR	rp2613
cpe:2.3:h:fiberhome:hg6245d:-:::::::*	0	OR

CVSS Version 2

Version
2.0

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

Access Vector
NETWORK

Access Compatibility
LOW

Authentication
NONE

Confidentiality Impact
PARTIAL

Integrity Impact
NONE

Availability Impact
NONE

Base Score
5

Severity
MEDIUM

Exploitability Score
10

Impact Score
2.9

CVSS Version 3

Version
3.1

Vector String
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK

Attack Compatibility
LOW

Privileges Required
NONE

User Interaction
NONE

Scope
UNCHANGED

Confidentiality Impact
HIGH

Availability Impact
HIGH

Base Score
9.8

Base Severity
CRITICAL

Exploitability Score
3.9

Impact Score
5.9

References

Reference URL	Reference Tags
https://pierrekim.github.io/blog/2021-01-12-fiberhome-ont-0day-vulnerabilities.html#httpd-decryption-algorithm	Exploit Third Party Advisory

Sources

Source Name	Source URL
NIST	https://nvd.nist.gov/vuln/detail/CVE-2021-27141
MITRE	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-27141

History

Created	Old Value	New Value	Data Type	Notes
2022-05-10 07:23:31				Added to TrackCVE
2022-12-05 21:50:57	2021-02-10T19:15Z	2021-02-10T19:15:12	CVE Published Date	updated
2022-12-05 21:50:57		2021-02-12T01:03:21	CVE Modified Date	updated
2022-12-05 21:50:57		Analyzed	Vulnerability Status	updated