Vulnerability Details : CVE-2017-5923
libyara/grammar.y in YARA 3.5.0 allows remote attackers to cause a denial of service (heap-based out-of-bounds read and application crash) via a crafted rule that is mishandled in the yara_yyparse function.
Vulnerability category: Denial of service
Products affected by CVE-2017-5923
- cpe:2.3:a:virustotal:yara:3.5.0:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2017-5923
0.62%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 76 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2017-5923
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
5.0
|
MEDIUM | AV:N/AC:L/Au:N/C:N/I:N/A:P |
10.0
|
2.9
|
NIST | |
|
7.5
|
HIGH | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
3.9
|
3.6
|
NIST |
CWE ids for CVE-2017-5923
-
The product reads data past the end, or before the beginning, of the intended buffer.Assigned by: nvd@nist.gov (Primary)
References for CVE-2017-5923
-
https://github.com/VirusTotal/yara/issues/597
Heap out of bounds read in yara_yyparse() · Issue #597 · VirusTotal/yara · GitHubExploit;Issue Tracking;Patch
-
http://www.securityfocus.com/bid/98080
YARA 'yara_yyparse()' Function Denial of Service Vulnerability
-
https://github.com/VirusTotal/yara/commit/ab906da53ff2a68c6fd6d1fa73f2b7c7bf0bc636
Fix issue #597 · VirusTotal/yara@ab906da · GitHubPatch;Vendor Advisory
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