ImageMagick UnmapBlob Function Denial of Service Vulnerability [CVE-2019-14980]
CVE number – CVE-2019-14980
A vulnerability in ImageMagick could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on a targeted system.The vulnerability is due to improper memory operations in the UnmapBlob function of the affected software.
An attacker could exploit this vulnerability by persuading a user to access a file that submits malicious input to the affected software. A successful exploit could allow the attacker to cause the system to stop responding, resulting in a DoS condition.ImageMagick confirmed the vulnerability and released updated software.
Analysis
- To exploit this vulnerability, the attacker may use misleading language or instructions to persuade a user to access a file that submits malicious input to the affected software.
Safeguards
- Administrators are advised to apply the appropriate updates.
Administrators are advised to allow only trusted users to have network access.
Administrators are advised to use an unprivileged account when browsing the Internet.
Administrators are advised to monitor critical systems.
Users are advised not to open email messages from suspicious or unrecognized sources. If users cannot verify that links or attachments included in email messages are safe, they are advised not to open them.
Users are advised not to visit websites or follow links that have suspicious characteristics or cannot be verified as safe.
Vendor Announcements
- ImageMagick Studio has released a bug report at the following link: Use after free in magick/blob.c #43
Fixed Software
- ImageMagick has released git commits at the following links: commit 614a257295bdcdeda347086761062ac7658b6830 and commit c5d012a46ae22be9444326aa37969a3f75daa3ba
Duncan is a technology professional with over 20 years experience of working in various IT roles. He has a interest in cyber security, and has a wide range of other skills in radio, electronics and telecommunications.