Ubuntu update for GnuTLS
| Risk | Low |
| Patch available | YES |
| Number of vulnerabilities | 6 |
| CVE-ID | CVE-2016-7444 CVE-2016-8610 CVE-2017-5334 CVE-2017-5335 CVE-2017-5336 CVE-2017-5337 |
| CWE-ID | CWE-20 CWE-388 CWE-415 CWE-119 CWE-121 CWE-122 |
| 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 6 vulnerabilities.
1) Security restrictions bypass
EUVDB-ID: #VU7655
Risk: Low
CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]
CVE-ID: CVE-2016-7444
CWE-ID:
CWE-20 - Improper input validation
Exploit availability: No
DescriptionThe 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.
Update the affected packages
Ubuntu: 12.04 - 16.10
CPE2.3- cpe:2.3:o:canonical:ubuntu:12.04:*:*:*:*:*:*:*
- cpe:2.3:o:canonical:ubuntu:14.04:*:*:*:*:*:*:*
- cpe:2.3:o:canonical:ubuntu:16.04:*:*:*:*:*:*:*
- cpe:2.3:o:canonical:ubuntu:16.10:*:*:*:*:*:*:*
https://www.ubuntu.com/usn/usn-3183-1/
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) Denial of service
EUVDB-ID: #VU1083
Risk: Low
CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]
CVE-ID: CVE-2016-8610
CWE-ID:
CWE-388 - Error Handling
Exploit availability: No
DescriptionThe vulnerability allows a remote unauthenticated user to exhaust memory on the target system.
The weakness is due to improper handling of certain packets by the ssl3_read_bytes() function in 'ssl/s3_pkt.c.
By sending a flood of SSL3_AL_WARNING alerts during the SSL handshake, a remote attacker can consume excessive CPU resources that may lead to OpenSSL library being unavailable.
Successful exploitation of the vulnerability results in denial of service on the vulnerable system.
Update the affected packages
Ubuntu: 12.04 - 16.10
CPE2.3https://www.ubuntu.com/usn/usn-3183-1/
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) Double free
EUVDB-ID: #VU7656
Risk: Low
CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]
CVE-ID: CVE-2017-5334
CWE-ID:
CWE-415 - Double Free
Exploit availability: No
DescriptionThe vulnerability allows a remote unauthenticated attacker to cause DoS condition on the target system.
The weakness exists due to insufficient validation of user-supplied input by the gnutls_x509_ext_import_proxy function. A remote attacker can send a specially crafted X.509 certificate with Proxy Certificate Information extension present, trigger double free error and cause the application to crash.
Successful exploitation of the vulnerability results in denial of service.
Update the affected packages
Ubuntu: 12.04 - 16.10
CPE2.3https://www.ubuntu.com/usn/usn-3183-1/
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) Memory corruption
EUVDB-ID: #VU7657
Risk: Low
CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]
CVE-ID: CVE-2017-5335
CWE-ID:
CWE-119 - Memory corruption
Exploit availability: No
DescriptionThe vulnerability allows a remote unauthenticated attacker to cause DoS condition on the target system.
The weakness exists due to insufficient error checking in the stream-reading functions. A remote attacker can send a specially crafted OpenPGP certificate, trigger memory corruption and cause the application to crash.
Successful exploitation of the vulnerability results in denial of service.
Update the affected packages
Ubuntu: 12.04 - 16.10
CPE2.3https://www.ubuntu.com/usn/usn-3183-1/
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) Stack-based buffer overflow
EUVDB-ID: #VU7658
Risk: Low
CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]
CVE-ID: CVE-2017-5336
CWE-ID:
CWE-121 - Stack-based buffer overflow
Exploit availability: No
DescriptionThe vulnerability allows a remote unauthenticated attacker to cause DoS condition on the target system.
The weakness exists due to improper processing of malicious OpenPGP certificates by the cdk_pk_get_keyid function. A remote attacker can send a specially crafted OpenPGP certificate, trigger stack-based buffer overflow and cause the application to crash.
Successful exploitation of the vulnerability results in denial of service.
Update the affected packages
Ubuntu: 12.04 - 16.10
CPE2.3https://www.ubuntu.com/usn/usn-3183-1/
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.
6) Heap-based buffer overflow
EUVDB-ID: #VU7660
Risk: Low
CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]
CVE-ID: CVE-2017-5337
CWE-ID:
CWE-122 - Heap-based Buffer Overflow
Exploit availability: No
DescriptionThe vulnerability allows a remote unauthenticated attacker to cause DoS condition on the target system.
The weakness exists due to improper processing of malicious OpenPGP certificates by the read_attribute function. A remote attacker can send a specially crafted OpenPGP certificate, trigger heap-based buffer overflow and cause the application to crash.
Successful exploitation of the vulnerability results in denial of service.
Update the affected packages
Ubuntu: 12.04 - 16.10
CPE2.3https://www.ubuntu.com/usn/usn-3183-1/
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.
