#VU40065 Information disclosure in Botan - CVE-2016-8871

Vulnerability identifier: #VU40065

Vulnerability risk: Medium

CVSSv4.0: 4.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2016-8871

CWE-ID: CWE-200

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Botan
Universal components / Libraries / Libraries used by multiple products

Vendor: Randombit

Description

The vulnerability allows a remote non-authenticated attacker to gain access to sensitive information.

In Botan 1.11.29 through 1.11.32, RSA decryption with certain padding options had a detectable timing channel which could given sufficient queries be used to recover plaintext, aka an "OAEP side channel" attack.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Botan: 1.11.29 - 1.11.32

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External links
https://www.securityfocus.com/bid/94225
https://botan.randombit.net/security.html

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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.