Ubuntu update for gnupg2



Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2019-13050
CWE-ID CWE-297
Exploitation vector Network
Public exploit N/A
Vulnerable software
 Ubuntu
Operating systems & Components / Operating system

gnupg (Ubuntu package)
Operating systems & Components / Operating system package or component

Vendor Canonical Ltd.

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Improper validation of certificate with host mismatch

EUVDB-ID: #VU20961

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2019-13050

CWE-ID: CWE-297 - Improper Validation of Certificate with Host Mismatch

Exploit availability: No

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

Update the affected package gnupg2 to the latest version.

Vulnerable software versions

Ubuntu: 18.04

gnupg (Ubuntu package): before 2.2.4-1ubuntu1.5

CPE2.3 External links

https://ubuntu.com/security/notices/USN-5431-1


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.



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