Code execution via overflowing trun sample allocation
Published Aug 25, 2021 · Updated Aug 3, 2024
Integer overflow in GPAC 1.0.1 MPEG-4 trun decoding allows remote attackers to corrupt memory through a crafted video. The trun_box_read function multiplies an untrusted 32-bit sample count by the GF_TrunEntry size without guarding size_t overflow, allocates an undersized heap buffer, and writes sample fields beyond it. Exploitation requires user interaction and a 32-bit build; successful memory corruption can execute code in the application's context.
Summary
What happened
Integer overflow in GPAC 1.0.1 MPEG-4 trun decoding allows remote attackers to corrupt memory through a crafted video. The trun_box_read function multiplies an untrusted 32-bit sample count by the GF_TrunEntry size without guarding size_t overflow, allocates an undersized heap buffer, and writes sample fields beyond it. Exploitation requires user interaction and a 32-bit build; successful memory corruption can execute code in the application's context.
The record
- CVE
- CVE-2021-21850
- Published
- Aug 25, 2021
- Updated
- Aug 3, 2024
- Vendor
- GPAC Project
- Product
- GPAC
- Classifications
- CWE-680, T1204.002
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 25, 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?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=GPAC Project Advanced Content commit a8a8d412dabcb129e695c3e7d861fcc81f608304, GPAC Project Advanced Content v1.0.1
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.
Public exploit references
- Cisco Talos trun decoder proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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