ClamAV parsehwp3_paragraph() Function Integer Overflow Denial of Service Vulnerability [CVE-2018-0360]

CVE Number –  CVE-2018-0360

A vulnerability in the parsehwp3_paragraph() function of ClamAV could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on a targeted system.

The vulnerability is due to an integer overflow condition in the parsehwp3_paragraph() function, as defined in the libclamav/hwp.c source code file of the affected software. An attacker could exploit this vulnerability by persuading a user to open a Hangul Word Processor (HWP) file that submits malicious input to the targeted system. An exploit could trigger an infinite loop condition, which could result in a DoS condition.

ClamAV confirmed the vulnerability and released software updates.

Analysis
  • To exploit this vulnerability, the attacker must have local access to the targeted system or use misleading language and instructions to persuade a user to open an HWP file that submits malicious input to the system.
Safeguards
  • 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.

Vendor Announcements
Fixed Software
  • ClamAV released a software update at the following link: ClamAV 0.100.1




Duncan Newell

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.

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