A vulnerability in the ReadOneJNGImage function of ImageMagick could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on a targeted system.
The vulnerability exists because of a missing NULL check in the ReadOneJNGImage function, as defined in the coders/png.c source code file of the affected software. An attacker could exploit this vulnerability by persuading a user to access a file that submits malicious input to the targeted system. A successful exploit could trigger a WriteBlob assertion failure and cause the affected application to crash, resulting in a DoS.
Proof-of-concept (PoC) code that demonstrates an exploit of this vulnerability is publicly available.
ImageMagick confirmed the vulnerability and released software updates.
To exploit this vulnerability, the attacker must have local access to the targeted system or use misleading language or instructions to persuade a user on the system to open a file that submits malicious input.
Administrators are advised to apply the appropriate updates.
Administrators are advised to allow only trusted users to have network access.
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.
Administrators are advised to use an unprivileged account when browsing the Internet.
Administrators are advised to monitor critical systems.
ImageMagick released an issue report at the following link: issue #1119
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Cisco Multivendor Vulnerability Alerts respond to vulnerabilities identified in third-party vendors' products. These alerts contain information compiled from diverse sources and provide comprehensive technical descriptions, objective analytical assessments, workarounds and practical safeguards, and links to vendor advisories and patches.