Vulnerability identifier: #VU45855

Vulnerability risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-8905

CWE-ID: CWE-120

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
asylo
/

Vendor: Google

Description

The vulnerability allows a remote authenticated user to gain access to sensitive information.

A buffer length validation vulnerability in Asylo versions prior to 0.6.0 allows an attacker to read data they should not have access to. The 'enc_untrusted_recvfrom' function generates a return value which is deserialized by 'MessageReader', and copied into three different 'extents'. The length of the third 'extents' is controlled by the outside world, and not verified on copy, allowing the attacker to force Asylo to copy trusted memory data into an untrusted buffer of significantly small length.. We recommend updating Asylo to version 0.6.0 or later.

Mitigation
Install update from vendor's website.

Vulnerable software versions

asylo: 0.2.0 - 0.5.3

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External links
http://github.com/google/asylo/commit/299f804acbb95a612ab7c504d25ab908aa59ae93

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

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