CVE-2013-5018

Severity: medium (CVSS 4.3 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 3.0% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2013-08-28 · updated 2026-06-16
Weakness: CWE-119

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.

Affected products

Opensuse: 11.4, 12.2, 12.3
strongSwan: 4.1.11, 5.0.0, 5.0.1, 5.0.2, 5.0.3, 5.0.4

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/54315
http://secunia.com/advisories/54524
http://strongswan.org/blog/2013/08/01/strongswan-5.1.0-released.html
http://strongswan.org/blog/2013/08/01/strongswan-denial-of-service-vulnerability-%28cve-2013-5018%29.html
http://www.securityfocus.com/bid/61564
https://lists.strongswan.org/pipermail/users/2013-July/009540.html
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

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