PT-2021-21859 · Grandstream · Grandstream Ht801

Adam Simuntis + 1 · Published 2021-10-27 · Updated 2021-11-03 · CVE-2021-37748

Positive Technologies (AI Summary)

CVSS v2.0

9.0

High

Base vector

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

Name of the Vulnerable Software and Affected Versions: Grandstream HT801 versions prior to 1.0.29

Description: The issue is related to multiple buffer overflows in the limited configuration shell (/sbin/gs config) that allow remote authenticated users to execute arbitrary code as root via a crafted manage if setting. This bypasses the intended restrictions of the shell, allowing full control of the device. Default weak credentials can be used to authenticate.

Recommendations: For versions prior to 1.0.29, update to version 1.0.29 or later to resolve the issue. As a temporary workaround, consider changing the default weak credentials to strong ones and restricting access to the /sbin/gs config shell until the update can be applied.

Exploit

Fix

Memory Corruption

Weakness Enumeration

CWE-787

Related Identifiers

CVE-2021-37748

Affected Products

Grandstream Ht801

References · 10

• 🔥 https://github.com/SECFORCE/CVE-2021-37748 · Exploit
• 🔥 https://secforce.com/blog/exploiting-grandstream-ht801-ata-cve-2021-37748-cve-2021-37915 · Exploit
• https://osv.dev/vulnerability/CVE-2021-37748 · Vendor Advisory
• http://grandstream.com/products/gateways-and-atas/analog-telephone-adaptors/product/ht801 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-37748 · Security Note
• https://t.me/rnetsec/15946 · Telegram Post
• https://t.me/pentestingnews/13033 · Telegram Post
• https://t.me/cybersecuritytechnologies/4614 · Telegram Post
• https://t.me/cibsecurity/31366 · Telegram Post
• https://t.me/defcon_news/88847 · Telegram Post