Process-memory corruption via unchecked ALS predictor order
Published Jun 18, 2022 · Updated Apr 15, 2025
Out-of-bounds write in FFmpeg 2.0's ALS decoder allows context-dependent attackers to corrupt process memory via crafted media. read_var_block_data accepts a predictor order larger than the current block length and uses it for array access in libavcodec/alsdec.c. Exploitation requires an application to decode attacker-controlled ALS data; the write can crash the application or compromise its process.
Summary
What happened
Out-of-bounds write in FFmpeg 2.0's ALS decoder allows context-dependent attackers to corrupt process memory via crafted media. read_var_block_data accepts a predictor order larger than the current block length and uses it for array access in libavcodec/alsdec.c. Exploitation requires an application to decode attacker-controlled ALS data; the write can crash the application or compromise its process.
The record
- CVE
- CVE-2014-125015
- Published
- Jun 18, 2022
- Updated
- Apr 15, 2025
- Vendor
- FFmpeg
- Product
- FFmpeg
- Classifications
- CWE-787, CWE-119, T1203
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 18, 2022CVE publishedPublication date reported by the CVE source.
- Apr 15, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=2.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
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Your stack
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