Security restrictions bypass in GnuTLS



Published: 2016-09-02 | Updated: 2017-08-02
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2016-7444
CWE-ID CWE-20
Exploitation vector Network
Public exploit N/A
Vulnerable software
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Operating systems & Components / Operating system

Vendor GNU

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Security restrictions bypass

EUVDB-ID: #VU7655

Risk: Low

CVSSv3.1: 6.4 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2016-7444

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote unauthenticated attacker to bypass security restrictions on the target system.

The weakness exists due to insufficient validation of the serial length of an OCSP response by the gnutls_ocsp_resp_check_crt function in the lib/x509/ocsp.c code. A remote attacker can bypass certificate validation and conduct further attacks.

Mitigation

Update to version 3.4.15 or 3.5.4.

Vulnerable software versions

Gnu: 3.3.24 - 3.5.3

External links

http://www.gnutls.org/security.html


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.



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