Application crash via unchecked LZW table index
Published Feb 18, 2020 · Updated Aug 6, 2024
Out-of-bounds read in NetSurf Libnsgif 0.1.2 allows context-dependent attackers to crash an application via a crafted GIF file. In gif_next_LZW, an oversized original LZW code is retained as oldcode and later used to index a fixed 4,096-entry table without an adequate bounds check. Exploitation requires a consuming application to decode attacker-supplied GIF data; the demonstrated consequence is a process crash, not data access or modification.
Summary
What happened
Out-of-bounds read in NetSurf Libnsgif 0.1.2 allows context-dependent attackers to crash an application via a crafted GIF file. In gif_next_LZW, an oversized original LZW code is retained as oldcode and later used to index a fixed 4,096-entry table without an adequate bounds check. Exploitation requires a consuming application to decode attacker-supplied GIF data; the demonstrated consequence is a process crash, not data access or modification.
The record
- CVE
- CVE-2015-7506
- Published
- Feb 18, 2020
- Updated
- Aug 6, 2024
- Vendor
- NetSurf
- Product
- Libnsgif
- Classifications
- CWE-125, T1203
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Feb 18, 2020CVE publishedPublication date reported by the CVE source.
- Aug 6, 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?
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- Affected versionversion=0.1.2
What conditions does exploitation require?
What is affected?
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
- Crafted GIF out-of-bounds-read proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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