Unauthenticated code execution via login format string
Published Aug 21, 2023 · Updated Oct 7, 2024
Format string injection in user_login.cgi in DrayTek Vigor 2620 before 3.9.8.4 allows remote attackers to execute arbitrary code. The login handler processes attacker-controlled payload data as a format string, permitting memory writes that alter code-segment content and place shellcode. No authentication or user interaction is required; successful exploitation runs code on the router, while less-capable payloads can reboot it.
Summary
What happened
Format string injection in user_login.cgi in DrayTek Vigor 2620 before 3.9.8.4 allows remote attackers to execute arbitrary code. The login handler processes attacker-controlled payload data as a format string, permitting memory writes that alter code-segment content and place shellcode. No authentication or user interaction is required; successful exploitation runs code on the router, while less-capable payloads can reboot it.
The record
- CVE
- CVE-2023-31447
- Published
- Aug 21, 2023
- Updated
- Oct 7, 2024
- Vendor
- DrayTek
- Product
- Vigor 2620
- Classifications
- CWE-94, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 21, 2023CVE publishedPublication date reported by the CVE source.
- Oct 7, 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=0 <3.9.8.4
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
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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