PHP exif_process_IFD_in_MAKERNOTE Function Out-of-Bounds Read Denial of Service Vulnerability [CVE-2018-14851]
CVE Number – CVE-2018-14851
A vulnerability in the exif_process_IFD_in_MAKERNOTE function of PHP could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on a targeted system.
The vulnerability is in the exif_process_IFD_in_MAKERNOTE function, as defined in the ext/exif/exif.csource code file of the affected software, and is due to improper processing of a customized JPEG file. An attacker could exploit this vulnerability by persuading a user to open a JPEG file that submits malicious input to the targeted system. A successful exploit could trigger an out-of-bounds read condition that causes the affected application to crash, resulting in a DoS condition.
PHP confirmed the vulnerability and released software updates.
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To exploit this vulnerability, the attacker must have local access to the targeted system or persuade a user on the system to open a JPEG file that submits malicious input to the affected application.
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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.
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PHP released a bug report at the following link: Bug 76557
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PHP released software updates at the following link: PHP Downloads
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.