#VU638 Memory corruption in Apple Inc. products - CVE-2016-2108

Vulnerability identifier: #VU638

Vulnerability risk: High

CVSSv4.0: 8.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2016-2108

CWE-ID: CWE-120

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
OpenSSL
Server applications / Encryption software
Oracle Solaris
Operating systems & Components / Operating system
Oracle Linux
Operating systems & Components / Operating system
macOS
Operating systems & Components / Operating system
Oracle Exalogic Infrastructure
Server applications / Remote management servers, RDP, SSH

Vendor: OpenSSL Software Foundation
Oracle
Apple Inc.

Description
The vulnerability allows a remote user to cause memory corruption on the target system.

The weakness exists due to buffer underflow with an out-of-bounds write in i2c_ASN1_INTEGER. As ASN.1 parser (specifically, d2i_ASN1_TYPE) can misinterpret a large universal tag as a negative zero value, attacker may easily corrupt memory.

Successful exploitation of the vulnerability will allow a malicious user to trigger memory corruption on the vulnerable system.

Mitigation
Update 1.0.2 to 1.0.2c.
Update 1.0.1 to 1.0.1c.

Vulnerable software versions

OpenSSL: 1.0.1, 1.0.2

Oracle Solaris: 10 - 11.3

Oracle Exalogic Infrastructure: 1.0 - 2.0

Oracle Linux: 5

macOS: 10.11 - 10.11.5

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External links
https://www.openssl.org/news/secadv/20160503.txt
https://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html
https://www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.html
https://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html
https://support.apple.com/cs-cz/HT206903

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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.