#VU40300 Input validation error in Debian Linux and Botan - CVE-2016-2194

Vulnerability identifier: #VU40300

Vulnerability 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-2016-2194

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Debian Linux
Operating systems & Components / Operating system
Botan
Universal components / Libraries / Libraries used by multiple products

Vendor: Debian
Randombit

Description

The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.

The ressol function in Botan before 1.10.11 and 1.11.x before 1.11.27 allows remote attackers to cause a denial of service (infinite loop) via unspecified input to the OS2ECP function, related to a composite modulus.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Debian Linux: 8.0

Botan: 1.11.0 - 1.11.26, 8.0

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External links
https://botan.randombit.net/security.html
https://marc.info/?l=botan-devel&m=145435148602911&w=2
https://marc.info/?l=botan-devel&m=145449001708138&w=2
https://www.debian.org/security/2016/dsa-3565
https://security.gentoo.org/glsa/201612-38

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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.