Vulnerability Monitor

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CVE-2013-5018

The is_asn1 function in strongSwan 4.1.11 through 5.0.4 does not properly validate the return value of the asn1_length function, which allows remote attackers to cause a denial of service (segmentation fault) via a (1) XAuth username, (2) EAP identity, or (3) PEM encoded file that starts with a 0x04, 0x30, or 0x31 character followed by an ASN.1 length value that triggers an integer overflow.

Security Impact Summary

CVE-2013-5018 is a security vulnerability that . Impacting 2 products from strongswan, from opensuse organizations running these solutions should prioritize assessment and patching.

Historical Context

Documented in 2013, this vulnerability occurred amid the cloud computing expansion era, where traditional network perimeter security models were being reevaluated. Organizations were transitioning from isolated infrastructure to interconnected systems, creating new attack surfaces that vulnerabilities like this could exploit.

Published

2013-08-28T23:55:10.650

Last Modified

2025-04-11T00:51:21.963

Status

Deferred

Source

[email protected]

Severity

CVSSv2: 4.3 (MEDIUM)

CVSSv2 Vector

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

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

Exploitability Score

8.6

Impact Score

2.9

Weaknesses

Type: Primary
CWE-119

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	strongswan	strongswan	4.1.11	Yes
Application	strongswan	strongswan	5.0.0	Yes
Application	strongswan	strongswan	5.0.1	Yes
Application	strongswan	strongswan	5.0.2	Yes
Application	strongswan	strongswan	5.0.3	Yes
Application	strongswan	strongswan	5.0.4	Yes
Operating System	opensuse	opensuse	11.4	Yes
Operating System	opensuse	opensuse	12.2	Yes
Operating System	opensuse	opensuse	12.3	Yes

References

http://lists.opensuse.org/opensuse-updates/2013-08/msg00021.html ([email protected])
http://lists.opensuse.org/opensuse-updates/2013-08/msg00022.html ([email protected])
http://lists.opensuse.org/opensuse-updates/2013-08/msg00050.html ([email protected])
http://secunia.com/advisories/54315 Vendor Advisory ([email protected])
http://secunia.com/advisories/54524 Vendor Advisory ([email protected])
http://strongswan.org/blog/2013/08/01/strongswan-5.1.0-released.html Vendor Advisory ([email protected])
http://strongswan.org/blog/2013/08/01/strongswan-denial-of-service-vulnerability-%28cve-2013-5018%29.html Vendor Advisory ([email protected])
http://www.securityfocus.com/bid/61564 ([email protected])
https://lists.strongswan.org/pipermail/users/2013-July/009540.html Exploit ([email protected])
http://lists.opensuse.org/opensuse-updates/2013-08/msg00021.html (af854a3a-2127-422b-91ae-364da2661108)
http://lists.opensuse.org/opensuse-updates/2013-08/msg00022.html (af854a3a-2127-422b-91ae-364da2661108)
http://lists.opensuse.org/opensuse-updates/2013-08/msg00050.html (af854a3a-2127-422b-91ae-364da2661108)
http://secunia.com/advisories/54315 Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://secunia.com/advisories/54524 Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://strongswan.org/blog/2013/08/01/strongswan-5.1.0-released.html Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://strongswan.org/blog/2013/08/01/strongswan-denial-of-service-vulnerability-%28cve-2013-5018%29.html Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://www.securityfocus.com/bid/61564 (af854a3a-2127-422b-91ae-364da2661108)
https://lists.strongswan.org/pipermail/users/2013-July/009540.html Exploit (af854a3a-2127-422b-91ae-364da2661108)

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For strongswan's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.