Severity

Medium

Vendor

Canonical Ubuntu

Versions Affected

• Canonical Ubuntu 14.04
• Canonical Ubuntu 18.04

Description

Due to a large number of issues discovered in GhostScript that prevent it from being used by ImageMagick safely, this update includes a default policy change that disables support for the Postscript and PDF formats in ImageMagick. This policy can be overridden if necessary by using an alternate ImageMagick policy configuration.

It was discovered that several memory leaks existed when handling certain images in ImageMagick. An attacker could use this to cause a denial of service. (CVE-2018-14434, CVE-2018-14435, CVE-2018-14436, CVE-2018-14437, CVE-2018-16640, CVE-2018-16750)

It was discovered that ImageMagick did not properly initialize a variable before using it when processing MAT images. An attacker could use this to cause a denial of service or possibly execute arbitrary code. This issue only affected Ubuntu 18.04 LTS. (CVE-2018-14551)

It was discovered that an information disclosure vulnerability existed in ImageMagick when processing XBM images. An attacker could use this to expose sensitive information. (CVE-2018-16323)

It was discovered that an out-of-bounds write vulnerability existed in ImageMagick when handling certain images. An attacker could use this to cause a denial of service or possibly execute arbitrary code. (CVE-2018-16642)

It was discovered that ImageMagick did not properly check for errors in some situations. An attacker could use this to cause a denial of service. (CVE-2018-16643)

It was discovered that ImageMagick did not properly validate image meta data in some situations. An attacker could use this to cause a denial of service. (CVE-2018-16644)

It was discovered that ImageMagick did not prevent excessive memory allocation when handling certain image types. An attacker could use this to cause a denial of service. (CVE-2018-16645)

Sergej Schumilo and Cornelius Aschermann discovered that ImageMagick did not properly check for NULL in some situations when processing PNG images. An attacker could use this to cause a denial of service. (CVE-2018-16749)

USN-3681-1 fixed vulnerabilities in Imagemagick. Unfortunately, the fix for CVE-2017-13144 introduced a regression in ImageMagick in Ubuntu 14.04 LTS and Ubuntu 16.04 LTS. This update reverts the fix for CVE-2017-13144 for those releases.

We apologize for the inconvenience.

CVEs contained in this USN include: CVE-2018-14434, CVE-2018-14435, CVE-2018-14436, CVE-2018-14437, CVE-2018-14551, CVE-2018-16323, CVE-2018-16640, CVE-2018-16642, CVE-2018-16643, CVE-2018-16644, CVE-2018-16645, CVE-2018-16749, CVE-2018-16750

Affected Cloud Foundry Products and Versions

Severity is medium unless otherwise noted.

• All versions of Cloud Foundry cflinuxfs2 prior to 1.240.0
• All versions of Cloud Foundry cflinuxfs3 prior to 0.28.0

Mitigation

Users of affected products are strongly encouraged to follow one of the mitigations below:

• The Cloud Foundry project recommends that Cloud Foundry deployments run with cflinuxfs2 version 1.240.0 or later.
• The Cloud Foundry project recommends that Cloud Foundry deployments run with cflinuxfs3 version 0.28.0 or later.

References

• USN-3785-1
• CVE-2018-14434
• CVE-2018-14435
• CVE-2018-14436
• CVE-2018-14437
• CVE-2018-14551
• CVE-2018-16323
• CVE-2018-16640
• CVE-2018-16642
• CVE-2018-16643
• CVE-2018-16644
• CVE-2018-16645
• CVE-2018-16749
• CVE-2018-16750