Pre-auth remote code execution via password decryption
Published Jul 6, 2023 · Updated Nov 14, 2024
Stack-based buffer overflow in Milesight UR32L 32.3.0.5 allows remote attackers to execute code through the HTTP login password. The uhttpd decrypt_string function AES-decrypts attacker-controlled, Base64-decoded password data into a fixed 72-byte stack buffer without checking the resulting length. Network access to the router's HTTP server is sufficient before authentication, and a return-address overwrite can execute commands as root.
Summary
What happened
Stack-based buffer overflow in Milesight UR32L 32.3.0.5 allows remote attackers to execute code through the HTTP login password. The uhttpd decrypt_string function AES-decrypts attacker-controlled, Base64-decoded password data into a fixed 72-byte stack buffer without checking the resulting length. Network access to the router's HTTP server is sufficient before authentication, and a return-address overwrite can execute commands as root.
The record
- CVE
- CVE-2023-23902
- Published
- Jul 6, 2023
- Updated
- Nov 14, 2024
- Vendor
- Milesight
- Product
- UR32L
- Classifications
- CWE-121, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 6, 2023CVE publishedPublication date reported by the CVE source.
- Nov 14, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=v32.3.0.5
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Talos UR32L password-decryption exploit demonstrationproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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