PT-2021-17290 · Fiberhome · Fiberhome Hg6245D

Pierre Kim · Published 2021-02-10 · Updated 2021-02-12 · CVE-2021-27171

Positive Technologies (AI Summary)

CVSS v2.0

10

Critical

Base vector

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

Name of the Vulnerable Software and Affected Versions: FiberHome HG6245D versions through RP2613

Description: An issue was discovered on FiberHome HG6245D devices, allowing an attacker to start a Linux telnetd as root on port 26/tcp. This can be achieved by using the CLI interface commands ddd and shell (or tshell).

Recommendations: For FiberHome HG6245D versions through RP2613, consider disabling the ddd and shell (or tshell) commands in the CLI interface as a temporary workaround until a patch is available. Restrict access to the CLI interface to minimize the risk of exploitation. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Memory Corruption

Weakness Enumeration

CWE-787

Related Identifiers

CVE-2021-27171

Affected Products

Fiberhome Hg6245D

References · 4

• 🔥 https://pierrekim.github.io/blog/2021-01-12-fiberhome-ont-0day-vulnerabilities.html#telnet-cli-privilege-escalation · Exploit
• https://osv.dev/vulnerability/CVE-2021-27171 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-27171 · Security Note
• https://t.me/cibsecurity/23403 · Telegram Post