PT-2021-17405 · D Link · D-Link Router Dir-842

Mav Levin · Published 2021-05-16 · Updated 2021-05-24 · CVE-2021-27342

Positive Technologies (AI Summary)

CVSS v3.1

5.9

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions D-Link Router model DIR-842 version 3.0.2

Description The issue concerns an authentication brute-force protection mechanism bypass in the telnetd service. This bypass allows a remote attacker to circumvent the anti-brute-force cool-down delay period via a timing-based side-channel attack.

Recommendations For D-Link Router model DIR-842 version 3.0.2, consider disabling the telnet service until a patch is available to prevent exploitation of the brute-force protection bypass. Restrict access to the telnetd service 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

Side Channel Attack

Weakness Enumeration

CWE-203

Related Identifiers

CVE-2021-27342

Affected Products

D-Link Router Dir-842

References · 10

• 🔥 https://github.com/guywhataguy/D-Link-CVE-2021-27342-exploit · Exploit
• 🔥 https://github.com/mavlevin/D-Link-CVE-2021-27342-exploit · Exploit
• 🔥 https://github.com/guywhataguy/D-Link-CVE-2021-27342-exploit/blob/main/dlink-telnet-exploit-CVE-2021-27342.py · Exploit
• 🔥 https://blog.whtaguy.com/2021/05/d-link-router-cve-2021-27342.html · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2021-27342 · Security Note
• https://supportannouncement.us.dlink.com/announcement/publication.aspx?name=SAP10225 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-27342 · Vendor Advisory
• https://t.me/rnetsec/14957 · Telegram Post
• https://t.me/defcon_news/76332 · Telegram Post
• https://t.me/cybersecuritytechnologies/3381 · Telegram Post