Libsndfile wav_write_header Out-of-Bounds Read Denial of Service Vulnerability [CVE-2019-3832]
CVE Number = CVE-2019-3832
A vulnerability in libsndfile could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on a targeted system.
The vulnerability exists in the wav_write_header function, as defined in the src/wav.c source code file of the affected software, and is due to a heap-based out-of-bounds read memory operation error that could occur when libsndfile handles audio files. An attacker could exploit this vulnerability by persuading a user to access a link or file that submits malicious input to the affected software. A successful exploit could allow the attacker to cause the affected software to terminate abnormally, resulting in a DoS condition.
Proof-of-concept (PoC) code that demonstrates an exploit of this vulnerability is publicly available.
Libsndfile has confirmed the vulnerability and released software updates.
Analysis
- To exploit this vulnerability, the attacker may use misleading language or instructions to persuade a user to access a link or file that submits malicious input to the affected software.
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
- Libsndfile has confirmed the vulnerability in a bug report at the following link: Incomplete fix for CVE-2018-19758
Fixed Software
- Libsndfile has released source code and software updates at the following links: wav_write_header: don’t read past the array end #460 and Libsndfile Releases
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.