Ubuntu update for zlib



Published: 2020-01-23
Risk Low
Patch available YES
Number of vulnerabilities 4
CVE-ID CVE-2016-9843
CVE-2016-9842
CVE-2016-9841
CVE-2016-9840
CWE-ID CWE-125
CWE-20
Exploitation vector Network
Public exploit N/A
Vulnerable software
Subscribe 		zlib (Ubuntu package)
Operating systems & Components / Operating system package or component

Vendor Canonical Ltd.

Security Bulletin

This security bulletin contains information about 4 vulnerabilities.

1) Denial of service

EUVDB-ID: #VU6666

Risk: Low

CVSSv3.1: 3.8 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2016-9843

CWE-ID: CWE-125 - Out-of-bounds read

Exploit availability: No

Description

The vulnerability allows a remote attacker to cause DoS condition on the target system.

The weakness exists in zlib due to big-endian out-of-bounds pointer. A remote attacker can send a specially crafted document, trick the victim into opening it, and cause the application to crash.

Successful exploitation of the vulnerability results in denial of service.

Mitigation

Update the affected packages.

Ubuntu 16.04 LTS
lib32z1 - 1:1.2.8.dfsg-2ubuntu4.3
lib64z1 - 1:1.2.8.dfsg-2ubuntu4.3
libn32z1 - 1:1.2.8.dfsg-2ubuntu4.3
libx32z1 - 1:1.2.8.dfsg-2ubuntu4.3
zlib1g - 1:1.2.8.dfsg-2ubuntu4.3

Vulnerable software versions

zlib (Ubuntu package): 1:1.2.8.dfsg-2ubuntu4.1

External links

http://usn.ubuntu.com/4246-1/


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: #VU6665

Risk: Low

CVSSv3.1: 3.8 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2016-9842

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to cause DoS condition on the target system.

The weakness exists in zlib due to an undefined left shift of negative number. A remote attacker can send a specially crafted document, trick the victim into opening it, and cause the application to crash.

Successful exploitation of the vulnerability results in denial of service.

Mitigation

Update the affected packages.

Ubuntu 16.04 LTS
lib32z1 - 1:1.2.8.dfsg-2ubuntu4.3
lib64z1 - 1:1.2.8.dfsg-2ubuntu4.3
libn32z1 - 1:1.2.8.dfsg-2ubuntu4.3
libx32z1 - 1:1.2.8.dfsg-2ubuntu4.3
zlib1g - 1:1.2.8.dfsg-2ubuntu4.3

Vulnerable software versions

zlib (Ubuntu package): 1:1.2.8.dfsg-2ubuntu4.1

External links

http://usn.ubuntu.com/4246-1/


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) Denial of service

EUVDB-ID: #VU6664

Risk: Low

CVSSv3.1: 3.8 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2016-9841

CWE-ID: CWE-125 - Out-of-bounds read

Exploit availability: No

Description

The vulnerability allows a remote attacker to cause DoS condition on the target system.

The weakness exists in zlib due to out-of-bounds pointer arithmetic in inftrees.c. A remote attacker can send a specially crafted document, trick the victim into opening it, and cause the application to crash.

Successful exploitation of the vulnerability results in denial of service.

Mitigation

Update the affected packages.

Ubuntu 16.04 LTS
lib32z1 - 1:1.2.8.dfsg-2ubuntu4.3
lib64z1 - 1:1.2.8.dfsg-2ubuntu4.3
libn32z1 - 1:1.2.8.dfsg-2ubuntu4.3
libx32z1 - 1:1.2.8.dfsg-2ubuntu4.3
zlib1g - 1:1.2.8.dfsg-2ubuntu4.3

Vulnerable software versions

zlib (Ubuntu package): 1:1.2.8.dfsg-2ubuntu4.1

External links

http://usn.ubuntu.com/4246-1/


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) Denial of service

EUVDB-ID: #VU6663

Risk: Low

CVSSv3.1: 3.8 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2016-9840

CWE-ID: CWE-125 - Out-of-bounds read

Exploit availability: No

Description

The vulnerability allows a remote attacker to cause DoS condition on the target system.

The weakness exists in zlib due to out-of-bounds pointer arithmetic in inftrees.c. A remote attacker can send a specially crafted document, trick the victim into opening it, and cause the application to crash.

Successful exploitation of the vulnerability results in denial of service.

Mitigation

Update the affected packages.

Ubuntu 16.04 LTS
lib32z1 - 1:1.2.8.dfsg-2ubuntu4.3
lib64z1 - 1:1.2.8.dfsg-2ubuntu4.3
libn32z1 - 1:1.2.8.dfsg-2ubuntu4.3
libx32z1 - 1:1.2.8.dfsg-2ubuntu4.3
zlib1g - 1:1.2.8.dfsg-2ubuntu4.3

Vulnerable software versions

zlib (Ubuntu package): 1:1.2.8.dfsg-2ubuntu4.1

External links

http://usn.ubuntu.com/4246-1/


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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