Home/CVE/The ASN.1 parser in strongSwan before 5.5.3 improperly handles CHOICE types when the x509 plugin is enabled, which allow
CVE

CVE-2017-9023

The ASN.1 parser in strongSwan before 5.5.3 improperly handles CHOICE types when the x509 plugin is enabled, which allow

The ASN.1 parser in strongSwan before 5.5.3 improperly handles CHOICE types when the x509 plugin is enabled, which allows remote attackers to cause a denial of service (infinite loop) via a crafted certificate.

HIGH · CVSS 7.5 EPSS 0.02101
Schedule remediation
  • SSVC automatable: yes - attacks can be scripted at scale
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-835Loop with Unreachable Exit Condition ('Infinite Loop')
CWE-835Loop with Unreachable Exit Condition ('Infinite Loop')
▤

Affected Products & Versions

1
strongswan<= 5.5.2
▣

Scoring & Timeline

7.5
HIGH · CVSS v3.1 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD08 Jun 2017 · 04:29 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
yes
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

5
suse-csafopenSUSE-SU-2024:11411-1
suse-csafSUSE-SU-2017:1471-1
suse-csafSUSE-SU-2017:1473-1
usnUSN-3301-1
cisa-csafcisa-csaf-csaf_files-OT-white-2019-icsa-19-155-01
🔗

References & Sources

4
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
http://www.debian.org/security/2017/dsa-3866Third Party Advisory
http://www.securityfocus.com/bid/98756Third Party AdvisoryVDB Entry
http://www.ubuntu.com/usn/USN-3301-1Third Party Advisory
https://www.strongswan.org/blog/2017/05/30/strongswan-vulnerability-%28cve-2017-9023%29.html
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