CVE-2013-5018

Vulnerability Description

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.

CVSS Score

Affected Products

Related Weaknesses (CWE)

References

• 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-vulnerabilityVendor 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