Use-after-free in gpgme package for GPGME library

1) Use-after-free

EUVDB-ID: #VU25501

Risk: High

CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-8945

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a use-after-free error, as demonstrated by use for container image pulls by Docker or CRI-O. A remote attacker can crash the target system, or cause potential code execution for Go applications that use this library under certain conditions during GPG signature verification.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

gpgme: 0.1.0

External links

http://bugzilla.redhat.com/show_bug.cgi?id=1795838
http://github.com/containers/image/commit/4c7a23f82ef09127b0ff28366d1cf31316dd6cc1
http://github.com/proglottis/gpgme/compare/v0.1.0...v0.1.1
http://github.com/proglottis/gpgme/pull/23

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.