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.

• CWE-119

• http://lists.opensuse.org/opensuse-updates/2013-08/msg00021.html
• http://lists.opensuse.org/opensuse-updates/2013-08/msg00022.html
• http://lists.opensuse.org/opensuse-updates/2013-08/msg00050.html
• http://secunia.com/advisories/54315Vendor Advisory
• http://secunia.com/advisories/54524Vendor Advisory
• http://strongswan.org/blog/2013/08/01/strongswan-5.1.0-released.htmlVendor Advisory
• http://strongswan.org/blog/2013/08/01/strongswan-denial-of-service-vulnerability-%28cve-2013-5018%29.htmlVendor Advisory
• http://www.securityfocus.com/bid/61564
• https://lists.strongswan.org/pipermail/users/2013-July/009540.htmlExploit
• http://lists.opensuse.org/opensuse-updates/2013-08/msg00021.html
• http://lists.opensuse.org/opensuse-updates/2013-08/msg00022.html
• http://lists.opensuse.org/opensuse-updates/2013-08/msg00050.html
• http://secunia.com/advisories/54315Vendor Advisory
• http://secunia.com/advisories/54524Vendor Advisory
• http://strongswan.org/blog/2013/08/01/strongswan-5.1.0-released.htmlVendor Advisory
• http://strongswan.org/blog/2013/08/01/strongswan-denial-of-service-vulnerability-%28cve-2013-5018%29.htmlVendor Advisory
• http://www.securityfocus.com/bid/61564
• https://lists.strongswan.org/pipermail/users/2013-July/009540.htmlExploit

Published

Aug 28, 2013

Last Modified

Jun 16, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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