cbcvebase.
CVE-2021-42165
published 2022-05-03

CVE-2021-42165: MitraStar GPT-2541GNAC-N1 (HGU) 100VNZ0b33 devices allow remote authenticated users to obtain root access by executing command "deviceinfo show file…

PriorityP269high8.8CVSS 3.1
AVNACLPRLUINSUCHIHAH
EXPLOIT
EPSS
13.72%
96.0th percentile
MitraStar GPT-2541GNAC-N1 (HGU) 100VNZ0b33 devices allow remote authenticated users to obtain root access by executing command "deviceinfo show file &&/bin/bash" because of incorrect sanitization of parameter "path".

Affected

1 ranges
VendorProductVersion rangeFixed in
mitrastargpt-2541gnac-n1_firmware——

Detection & IOCsextracted from sources · hover to see the quote

commanddeviceinfo show file &&/bin/bash↗
  • →Alert on execution of 'deviceinfo show file' commands that include shell metacharacters (e.g., '&&') in the 'path' parameter, indicating unsanitized input exploitation. ↗
  • →Detect unexpected spawning of /bin/bash as a child process of the restricted CLI shell on MitraStar HGU devices, which would indicate successful privilege escalation to root. ↗
  • ·Exploit requires prior authenticated access via SSH; credentials may be default (printed on the back of the router), so detection of SSH logins with default credentials is a relevant precursor indicator. ↗
  • ·Vulnerability is confirmed on firmware version BR_g3.5_100VNZ0b33 specifically; other firmware versions may or may not be affected. ↗

CVSS provenance

nvdv3.18.8HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
nvdv2.09.0CRITICALAV:N/AC:L/Au:S/C:C/I:C/A:C
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