Lucky Thirteen Attack in GnuTLS implementation



Risk Low
Patch available YES
Number of vulnerabilities 3
CVE-ID CVE-2018-10844
CVE-2018-10845
CVE-2018-10846
CWE-ID CWE-327
CWE-310
Exploitation vector Network
Public exploit N/A
Vulnerable software
 GnuTLS
Universal components / Libraries / Libraries used by multiple products

Vendor GnuTLS

Security Bulletin

This security bulletin contains information about 3 vulnerabilities.

1) Use of a broken or risky cryptographic algorithm

EUVDB-ID: #VU15707

Risk: Low

CVSSv4.0: 1.7 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2018-10844

CWE-ID: CWE-327 - Use of a Broken or Risky Cryptographic Algorithm

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to usage of an insecure implementation of HMAC-SHA-256 algorithm vulnerable to a Lucky thirteen style attack. A remote attacker with ability to intercept traffic can recover encrypted data.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

GnuTLS: 0.0.3 - 3.6.2

CPE2.3 External links

https://www.securityfocus.com/bid/105138
https://access.redhat.com/errata/RHSA-2018:3050
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-10844
https://eprint.iacr.org/2018/747
https://gitlab.com/gnutls/gnutls/merge_requests/657
https://lists.debian.org/debian-lts-announce/2018/10/msg00022.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.

2) Use of a broken or risky cryptographic algorithm

EUVDB-ID: #VU15708

Risk: Low

CVSSv4.0: 1.7 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2018-10845

CWE-ID: CWE-327 - Use of a Broken or Risky Cryptographic Algorithm

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to usage of an insecure implementation of HMAC-SHA-384 algorithm vulnerable to a Lucky thirteen style attack. A remote attacker with ability to intercept traffic can recover encrypted data.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

GnuTLS: 0.0.3 - 3.6.2

CPE2.3 External links

https://www.securityfocus.com/bid/105138
https://access.redhat.com/errata/RHSA-2018:3050
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-10845
https://eprint.iacr.org/2018/747
https://gitlab.com/gnutls/gnutls/merge_requests/657
https://lists.debian.org/debian-lts-announce/2018/10/msg00022.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.

3) Cryptographic issues

EUVDB-ID: #VU15709

Risk: Low

CVSSv4.0: 1.7 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2018-10846

CWE-ID: CWE-310 - Cryptographic Issues

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to a cache-based side channel in GnuTLS implementation that can lead to recovery of data in cross-VM attack setting. A remote attacker with ability to intercept traffic can recover encrypted data using a combination of "Just in Time" Prime+probe attack in combination with Lucky-13 attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

GnuTLS: 3.6.0 - 3.6.2

CPE2.3 External links

https://www.securityfocus.com/bid/105138
https://access.redhat.com/errata/RHSA-2018:3050
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-10846
https://eprint.iacr.org/2018/747
https://gitlab.com/gnutls/gnutls/merge_requests/657
https://lists.debian.org/debian-lts-announce/2018/10/msg00022.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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