ImageMagick LocaleLowercase Out-of-Bounds Access Vulnerability [CVE-2019-10714]

CVE Number – CVE-2019-10714

A vulnerability in the LocaleLowercase function of ImageMagick could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on a targeted system.

The vulnerability is due to an out-of-bounds access condition that exists in the LocaleLowercasefunction, as defined in the MagickCore/locale.c source code file of the affected software. An attacker could exploit this vulnerability by persuading a user to access a link that submits malicious input to the targeted system. A successful exploit could trigger a segmentation fault (SIGSEGV), resulting in a DoS condition.Proof-of-concept (PoC) code that demonstrates an exploit of this vulnerability is publicly available.ImageMagick has confirmed the vulnerability and released software updates.

Analysis

• To exploit this vulnerability, an attacker may use misleading language or instructions to persuade a user to access a link that submits malicious input to the targeted system.

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 has released a bug report at the following link: Out-of-boundary in function LocaleLowercase of MagickCore/locale.c #1495

Fixed Software

• ImageMagick has released a software update and git commits at the following links: ImageMagick 7.0.8-32, commits 07eebcd72f45c8fd7563d3f9ec5d2bed48f65f36, 58d9c46929ca0828edde34d263700c3a5fe8dc3c, and edc7d3035883ddca8413e4fe7689aa2e579ef04a