Remote code execution via BMP heap overflow
Published Mar 1, 2021 · Updated Aug 3, 2024
Heap buffer overflow in ONLYOFFICE DocumentServer 4.0.0-9 through 6.0.0 allows remote attackers to execute code via crafted BMP data. The x2t converter passes an inline BMP from a DOCT-to-DOCX request into CxImageBMP::Decode, where unchecked run-length and offset values permit an arbitrary-size heap write beyond the allocated image buffer. An unauthenticated network request can overwrite the media-directory path, replace the x2t conversion binary, and trigger attacker-supplied code in a later conversion request.
Summary
What happened
Heap buffer overflow in ONLYOFFICE DocumentServer 4.0.0-9 through 6.0.0 allows remote attackers to execute code via crafted BMP data. The x2t converter passes an inline BMP from a DOCT-to-DOCX request into CxImageBMP::Decode, where unchecked run-length and offset values permit an arbitrary-size heap write beyond the allocated image buffer. An unauthenticated network request can overwrite the media-directory path, replace the x2t conversion binary, and trigger attacker-supplied code in a later conversion request.
The record
- CVE
- CVE-2021-25832
- Published
- Mar 1, 2021
- Updated
- Aug 3, 2024
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-787, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Mar 1, 2021CVE publishedPublication date reported by the CVE source.
- Aug 3, 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?
What conditions does exploitation require?
What is affected?
Affected products and versions are unavailable in this record.
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.
Public exploit references
- remote_cximage_bmp_poc.pyproof of concept · unverified
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Technologies
Your stack
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Your stack
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