Red Hat Linux update for NSS library

1) NULL pointer dereference

EUVDB-ID: #VU6841

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-2017-7502

CWE-ID: CWE-476 - NULL Pointer Dereference

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to NULL pointer dereference error in NSS since 3.24.0 when processing empty SSLv2 messages, received from clients. A remote attacker can send specially crafted request to vulnerable service and perform denial of service attack.

Mitigation

Update the affected package to version nss-3.28.4-1.2.el7_3 or nss-3.28.4-3.el6_9

Vulnerable software versions

Red Hat Enterprise Linux for x86_64: 6 - 7.0

External links

http://access.redhat.com/errata/RHSA-2017:1364
http://access.redhat.com/errata/RHSA-2017:1365

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.