Vulnerability identifier: #VU40716

Vulnerability risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2015-4145

CWE-ID: CWE-399

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
hostapd
Server applications / Remote access servers, VPN
Opensuse
Operating systems & Components / Operating system
wpa_supplicant
Server applications / Encryption software

Vendor: Jouni Malinen
SUSE

Description

The vulnerability allows a remote non-authenticated attacker to perform service disruption.

The EAP-pwd server and peer implementation in hostapd and wpa_supplicant 1.0 through 2.4 does not validate a fragment is already being processed, which allows remote attackers to cause a denial of service (memory leak) via a crafted message.

Mitigation
Install update from vendor's website.

Vulnerable software versions

hostapd: 1.0 - 2.4

Opensuse: 1.0 - 13.2

wpa_supplicant: 1.0 - 13.2

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External links
http://lists.opensuse.org/opensuse-updates/2015-06/msg00019.html
http://w1.fi/security/2015-4/eap-pwd-missing-payload-length-validation.txt
http://www.debian.org/security/2015/dsa-3397
http://www.openwall.com/lists/oss-security/2015/05/09/6
http://www.openwall.com/lists/oss-security/2015/05/31/6
http://www.ubuntu.com/usn/USN-2650-1
http://security.gentoo.org/glsa/201606-17

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.