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CVE-2018-19974

Date: December 17, 2018

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).

Language: C#

Severity Score

Related Resources (7)

https://security-tracker.debian.org/tracker/CVE-2018-19974
https://nvd.nist.gov/vuln/detail/CVE-2018-19974
https://github.com/VirusTotal/yara/issues/999
https://github.com/bnbdr/swisscheese/
https://bnbdr.github.io/posts/extracheese/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DFFXDAMP6GJ337LIOTVF5I4T6QGMN3ZR/
https://www.mend.io/vulnerability-database/CVE-2018-19974

Severity Score

Weakness Type (CWE)

Information Leak / Disclosure

CWE-200

Use of Uninitialized Resource

CWE-908

CVSS v3.1

Base Score:
Attack Vector (AV): LOCAL
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): REQUIRED
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): NONE
Availability (A): NONE

CVSS v2

Base Score:
Access Vector (AV): NETWORK
Access Complexity (AC): MEDIUM
Authentication (AU): NONE
Confidentiality (C): PARTIAL
Integrity (I): NONE
Availability (A): NONE
Additional information:

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