Process crash via unchecked null colormap dereference
Published Sep 7, 2021 · Updated Aug 4, 2024
NULL pointer dereference in gifsicle 1.92 allows attackers to crash the command-line process via a crafted GIF image. The find_color_or_error function reads gfcm->ncol without first checking whether the colormap pointer is null. Exploitation requires the target to process the image while invoked with -t 1; the demonstrated result is a process abort, not data disclosure or modification.
Summary
What happened
NULL pointer dereference in gifsicle 1.92 allows attackers to crash the command-line process via a crafted GIF image. The find_color_or_error function reads gfcm->ncol without first checking whether the colormap pointer is null. Exploitation requires the target to process the image while invoked with -t 1; the demonstrated result is a process abort, not data disclosure or modification.
The record
- CVE
- CVE-2020-19752
- Published
- Sep 7, 2021
- Updated
- Aug 4, 2024
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-476, T1499.004
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 7, 2021CVE publishedPublication date reported by the CVE source.
- Aug 4, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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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.
Weakness, pattern, technique
Public exploit references
- Malformed colormapless GIF proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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