Ubuntu update for OpenSSL

Published: 2017-12-11

Risk	Medium
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2017-3737 CVE-2017-3738
CWE-ID	CWE-20 CWE-120
Exploitation vector	Network
Public exploit	N/A
Vulnerable software	Ubuntu Operating systems & Components / Operating system
Vendor	Canonical Ltd.

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Improper input validation

EUVDB-ID: #VU9594

Risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2017-3737

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information on the target system.

The weakness exists due to an "error state mechanism" when SSL_read() or SSL_write() is called directly after SSL object. A remote attacker can a specially crafted input, trigger a fatal error during a handshake and return it in the initial function call to access or modify sensitive information.

Mitigation

Update the affected packages

Ubuntu 17.10:

libssl1.0.0 1.0.2g-1ubuntu13.3

Ubuntu 17.04:

libssl1.0.0 1.0.2g-1ubuntu11.4

Ubuntu 16.04 LTS:

libssl1.0.0 1.0.2g-1ubuntu4.10

Vulnerable software versions

Ubuntu: 16.04 - 17.10

CPE2.3

External links

https://www.ubuntu.com/usn/usn-3512-1/

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.

2) Buffer overflow

EUVDB-ID: #VU9595

Risk: Low

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2017-3738

CWE-ID: CWE-120 - Buffer overflow