PHP EXIF exif_process_IFD_in_MAKERNOTE Heap Buffer Overflow Vulnerability [CVE-2019-11034]

CVE Number – CVE-2019-11034

A vulnerability in the EXIF component of PHP could allow an unauthenticated, remote attacker to access sensitive information on a targeted system.

The vulnerability exists in the exif_process_IFD_in_MAKERNOTE method, as defined in the ext/exif/exif.c source code file of the affected software, and is due to a heap buffer overflow memory operation by the affected software. An attacker could exploit this vulnerability by sending requests that submit malicious input to the affected software. A successful exploit could allow the attacker to access sensitive information, which could be used to conduct further attacks.The PHP Project has confirmed the vulnerability and released software updates.

Analysis

• To exploit this vulnerability, the attacker must send malicious requests to the targeted system, making exploitation more difficult in environments that restrict network access from untrusted sources.

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 run both firewall and antivirus applications to minimize the potential of inbound and outbound threats.
  
  Administrators may consider using IP-based access control lists (ACLs) to allow only trusted systems to access the affected systems.
  
  Administrators can help protect affected systems from external attacks by using a solid firewall strategy.
  
  Administrators are advised to monitor affected systems.

Vendor Announcements

• The PHP Project has published a bug report at the following link: Sec Bug #77753 Heap-buffer-overflow in php_ifd_get32s

Fixed Software

• The PHP Project has released software updates at the following link: PHP Downloads