PT-2021-4449 · D Link · Dsr-500N

Daniel Nussko · Published 2021-08-23 · Updated 2024-08-04 · CVE-2021-39615

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 D-Link DSR-500N version 1.02 D-Link DSR-500N versions prior to 2.12/2

Description The issue is related to hard-coded credentials for undocumented user accounts in the '/etc/passwd' file. If an attacker recovers the cleartext password of the identified hash value, they can log in via SSH or Telnet and gain access to the underlying embedded Linux operating system on the device.

Recommendations For D-Link DSR-500N version 1.02, update to version 2.12/2 to resolve the issue. For D-Link DSR-500N versions prior to 2.12/2, update to version 2.12/2 to resolve the issue. As a temporary workaround, consider restricting access to the '/etc/passwd' file and limiting SSH and Telnet connections to minimize the risk of exploitation.

Exploit

Fix

Using Hardcoded Credentials

Weakness Enumeration

CWE-798

Related Identifiers

BDU:2021-05080

CVE-2021-39615

Affected Products

Dsr-500N

References · 9

• 🔥 https://nussko.com/advisories/advisory-2021-08-02.txt · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2021-39615 · Security Note
• https://dlink.com/en/security-bulletin · Vendor Advisory
• https://supportannouncement.us.dlink.com/announcement/publication.aspx?name=SAP10235 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-39615 · Vendor Advisory
• https://bdu.fstec.ru/vul/2021-05080 · Security Note
• https://t.me/cibsecurity/27743 · Telegram Post
• https://t.me/cvenotify/19956 · Telegram Post
• https://t.me/cvenotify/88895 · Telegram Post