Buffer overflow in Dlink Dap-1520
CVE-2020-15892
An issue was discovered in apply.cgi on D-Link DAP-1520 devices before 1.10b04Beta02. Whenever a user performs a login action from the web interface, the request values are being forwarded to the ssi binary. On the login page, the web interface restricts the password input field to a fixed length of 15 characters. The problem is that validation is being done on the client side, hence it can be bypassed. When an attacker manages to intercept the login request (POST based) and tampers with the vulnerable parameter (log_pass), to a larger length, the request will be forwarded to the webserver. This results in a stack-based buffer overflow. A few other POST variables, (transferred as part of the login request) are also vulnerable: html_response_page and log_user.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.016 (75.4th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 75th percentile — 75.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.016 · newest: 0.016 · change: 0.000
Affected products
- Dlink Dap-1520 — versions a1
- Dlink Dap-1520 Firmware
Weakness classification (CWE)
References
- research.loginsoft.com/bugs/classic-stack-based-buffer-overflow-in-dlink-firmwa… (Exploit, Third Party Advisory)
- supportannouncement.us.dlink.com/announcement/publication.aspx (Patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2020-15892?
- CVE-2020-15892 is a critical-severity vulnerability in Dlink Dap-1520, classified under Incorrect Resource Transfer Between Spheres. CVSS score: 9.8/10. Published 2020-07-22.
- How severe is CVE-2020-15892?
- Critical severity. CVSS v3 base score is 9.8 out of 10.