Vulnerability Monitor

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CVE-2018-19974

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).

Published

2018-12-17T19:29:01.080

Last Modified

2024-11-21T03:58:55.210

Status

Modified

Source

[email protected]

Severity

CVSSv3.0: 5.5 (MEDIUM)

CVSSv2 Vector

AV:N/AC:M/Au:N/C:P/I:N/A:N

Access Vector: NETWORK
Access Complexity: MEDIUM
Authentication: NONE
Confidentiality Impact: PARTIAL
Integrity Impact: NONE
Availability Impact: NONE

Exploitability Score

8.6

Impact Score

2.9

Weaknesses

Type: Primary
CWE-908

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	virustotal	yara	3.8.1	Yes

References

https://bnbdr.github.io/posts/extracheese/ Exploit, Third Party Advisory ([email protected])
https://github.com/VirusTotal/yara/issues/999 Exploit, Issue Tracking, Third Party Advisory ([email protected])
https://github.com/bnbdr/swisscheese/ Exploit, Third Party Advisory ([email protected])
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DFFXDAMP6GJ337LIOTVF5I4T6QGMN3ZR/ ([email protected])
https://bnbdr.github.io/posts/extracheese/ Exploit, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/VirusTotal/yara/issues/999 Exploit, Issue Tracking, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/bnbdr/swisscheese/ Exploit, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DFFXDAMP6GJ337LIOTVF5I4T6QGMN3ZR/ (af854a3a-2127-422b-91ae-364da2661108)