Use of Uninitialized Resource Affecting yara package, versions <3.8.1-2
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published24 Sept 2026
- disclosed17 Dec 2018
Introduced: 17 Dec 2018
CVE-2018-19974 (opens in a new tab)How to fix?
Upgrade Echo:latest yara to version 3.8.1-2 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream yara package and not the yara package as distributed by Echo.
See How to fix? for Echo:latest relevant fixed versions and status.
In YARA 3.8.1, bytecode in a specially crafted compiled rule can read uninitialized data from VM scratch memory in libyara/exec.c. This can allow attackers to discover addresses in the real stack (not the YARA virtual stack).
References
- https://advisory.echohq.com/cve/CVE-2018-19974
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/DFFXDAMP6GJ337LIOTVF5I4T6QGMN3ZR/
- https://bnbdr.github.io/posts/extracheese/
- https://github.com/VirusTotal/yara/issues/999
- https://github.com/bnbdr/swisscheese/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DFFXDAMP6GJ337LIOTVF5I4T6QGMN3ZR/