Vulnerability Details : CVE-2017-9438
libyara/re.c in the regexp module in YARA 3.5.0 allows remote attackers to cause a denial of service (stack consumption) via a crafted rule (involving hex strings) that is mishandled in the _yr_re_emit function, a different vulnerability than CVE-2017-9304.
Vulnerability category: Denial of service
Products affected by CVE-2017-9438
- cpe:2.3:a:virustotal:yara:3.5.0:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2017-9438
0.77%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 79 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2017-9438
| 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-2017-9438
-
The product does not properly control the amount of recursion that takes place, consuming excessive resources, such as allocated memory or the program stack.Assigned by: nvd@nist.gov (Primary)
References for CVE-2017-9438
-
https://github.com/VirusTotal/yara/issues/674
Stack overflow in _yr_re_emit() · Issue #674 · VirusTotal/yara · GitHubIssue Tracking;Patch
-
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/FKNXSH5ERG6NELTXCYVJLUPJJJ2TNEBD/
[SECURITY] Fedora 33 Update: python-yara-4.1.0-1.fc33 - package-announce - Fedora Mailing-Lists
-
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/XXM224OLGI6KAOROLDPPGGCZ2OQVQ6HH/
[SECURITY] Fedora 34 Update: yara-4.1.0-1.fc34 - package-announce - Fedora Mailing-Lists
-
https://github.com/VirusTotal/yara/commit/10e8bd3071677dd1fa76beeef4bc2fc427cea5e7
Fix issue #674 for hex strings. · VirusTotal/yara@10e8bd3 · GitHubPatch
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