#VU38195 Input validation error in Botan - CVE-2017-14737

Vulnerability identifier: #VU38195

Vulnerability risk: Low

CVSSv4.0: 4.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2017-14737

CWE-ID: CWE-20

Exploitation vector: Local

Exploit availability: No

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

Vendor: Randombit

Description

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

A cryptographic cache-based side channel in the RSA implementation in Botan before 1.10.17, and 1.11.x and 2.x before 2.3.0, allows a local attacker to recover information about RSA secret keys, as demonstrated by CacheD. This occurs because an array is indexed with bits derived from a secret key.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Botan: 1.11.0 - 1.11.34, 2.0.0 - 2.0.1, 2.1.0, 2.2.0

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External links
https://github.com/randombit/botan/issues/1222
https://www.usenix.org/conference/usenixsecurity17/technical-sessions/presentation/wang-shuai

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

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