#VU20961 Improper validation of certificate with host mismatch


Published: 2019-09-10

Vulnerability identifier: #VU20961

Vulnerability risk: Medium

CVSSv3.1:

CVE-ID: CVE-2019-13050

CWE-ID: CWE-297

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
SKS Keyserver
Server applications / Other server solutions
GnuPG
Client/Desktop applications / Encryption software

Vendor: sks-keyservers.net
GNU

Description

The vulnerability allows a remote attacker to cause a persistent denial of service (DoS) condition on the target system.

The vulnerability exists due to the interaction between the vulnerable applications makes it risky to have a GnuPG keyserver configuration line referring to a host on the SKS keyserver network. A remote attacker can retrieve data from this network and cause a persistent denial of service, because of a certificate spamming attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

SKS Keyserver: 1.2.0

GnuPG: 1.0.0 - 2.2.16


CPE

External links
http://gist.github.com/rjhansen/67ab921ffb4084c865b3618d6955275f
http://lists.gnupg.org/pipermail/gnupg-announce/2019q3/000439.html


Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?


Latest bulletins with this vulnerability