Ubuntu update for GnuTLS



Published: 2019-05-30
Risk High
Patch available YES
Number of vulnerabilities 5
CVE-ID CVE-2018-10844
CVE-2018-10845
CVE-2018-10846
CVE-2019-3829
CVE-2019-3836
CWE-ID CWE-327
CWE-310
CWE-415
CWE-119
Exploitation vector Network
Public exploit N/A
Vulnerable software
Subscribe 		gnutls28 (Ubuntu package)
Operating systems & Components / Operating system package or component

Vendor Canonical Ltd.

Security Bulletin

This security bulletin contains information about 5 vulnerabilities.

1) Use of a broken or risky cryptographic algorithm

EUVDB-ID: #VU15707

Risk: Low

CVSSv3.1: 3.5 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N/E:U/RL:O/RC:C]

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

Update the affected packages.

Ubuntu 19.04
libgnutls30 - 3.6.5-2ubuntu1.1
Ubuntu 18.10
libgnutls30 - 3.6.4-2ubuntu1.2
Ubuntu 18.04 LTS
libgnutls30 - 3.5.18-1ubuntu1.1
Ubuntu 16.04 LTS
libgnutls30 - 3.4.10-4ubuntu1.5

Vulnerable software versions

gnutls28 (Ubuntu package): 3.4.10-4ubuntu1.1 - 3.6.4-2ubuntu1.1

External links

http://usn.ubuntu.com/3999-1/


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) Use of a broken or risky cryptographic algorithm

EUVDB-ID: #VU15708

Risk: Low

CVSSv3.1: 3.5 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N/E:U/RL:O/RC:C]

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

Update the affected packages.

Ubuntu 19.04
libgnutls30 - 3.6.5-2ubuntu1.1
Ubuntu 18.10
libgnutls30 - 3.6.4-2ubuntu1.2
Ubuntu 18.04 LTS
libgnutls30 - 3.5.18-1ubuntu1.1
Ubuntu 16.04 LTS
libgnutls30 - 3.4.10-4ubuntu1.5

Vulnerable software versions

gnutls28 (Ubuntu package): 3.4.10-4ubuntu1.1 - 3.6.4-2ubuntu1.1

External links

http://usn.ubuntu.com/3999-1/


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.

3) Cryptographic issues

EUVDB-ID: #VU15709

Risk: Low

CVSSv3.1: 3.5 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N/E:U/RL:O/RC:C]

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

Update the affected packages.

Ubuntu 19.04
libgnutls30 - 3.6.5-2ubuntu1.1
Ubuntu 18.10
libgnutls30 - 3.6.4-2ubuntu1.2
Ubuntu 18.04 LTS
libgnutls30 - 3.5.18-1ubuntu1.1
Ubuntu 16.04 LTS
libgnutls30 - 3.4.10-4ubuntu1.5

Vulnerable software versions

gnutls28 (Ubuntu package): 3.4.10-4ubuntu1.1 - 3.6.4-2ubuntu1.1

External links

http://usn.ubuntu.com/3999-1/


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.

4) Double free

EUVDB-ID: #VU18107

Risk: High

CVSSv3.1: 7.1 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-3829

CWE-ID: CWE-415 - Double Free

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a double free error in the certificate verification API when processing X.509  crtificates. A remote attacker can supply a specially crafted X.509  certificate, trigger double free error and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation

Update the affected packages.

Ubuntu 19.04
libgnutls30 - 3.6.5-2ubuntu1.1
Ubuntu 18.10
libgnutls30 - 3.6.4-2ubuntu1.2
Ubuntu 18.04 LTS
libgnutls30 - 3.5.18-1ubuntu1.1
Ubuntu 16.04 LTS
libgnutls30 - 3.4.10-4ubuntu1.5

Vulnerable software versions

gnutls28 (Ubuntu package): 3.4.10-4ubuntu1.1 - 3.6.4-2ubuntu1.1

External links

http://usn.ubuntu.com/3999-1/


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.

5) Buffer overflow

EUVDB-ID: #VU18106

Risk: Medium

CVSSv3.1: 5.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-3836

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform denial of service attack.

The vulnerability exists due to uninitialized pointer access when processing TLS1.3 asynchronous messages. A remote attacker can pass specially crafted asynchronous post-handshake message, trigger memory corruption and perform denial of service attack.

Mitigation

Update the affected packages.

Ubuntu 19.04
libgnutls30 - 3.6.5-2ubuntu1.1
Ubuntu 18.10
libgnutls30 - 3.6.4-2ubuntu1.2
Ubuntu 18.04 LTS
libgnutls30 - 3.5.18-1ubuntu1.1
Ubuntu 16.04 LTS
libgnutls30 - 3.4.10-4ubuntu1.5

Vulnerable software versions

gnutls28 (Ubuntu package): 3.4.10-4ubuntu1.1 - 3.6.4-2ubuntu1.1

External links

http://usn.ubuntu.com/3999-1/


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.



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