Ruby Zlib Interface Fails to Ensure Safe Data Storage

Summary

A flaw in the Ruby Zlib interface can cause data to be stored in an incorrect location, potentially leading to memory corruption. This issue affects users of the affected versions who decompress data from external sources. Update to the latest fixed version to ensure safe data handling.

What to do

Update zlib to version 3.2.3.
Update zlib to version 3.1.2.
Update zlib to version 3.0.1.

Affected software

Ecosystem	Vendor	Product	Affected versions
rubygems	–	zlib	>= 3.2.0, < 3.2.3 >= 3.1.0, < 3.1.2 < 3.0.1 Fix: upgrade to 3.2.3

Original title

zlib is a Ruby interface for the zlib compression/decompression library. Versions 3.0.0 and below, 3.1.0, 3.1.1, 3.2.0 and 3.2.1 contain a buffer overflow vulnerability in the Zlib::GzipReader. The...

Original description

zlib is a Ruby interface for the zlib compression/decompression library. Versions 3.0.0 and below, 3.1.0, 3.1.1, 3.2.0 and 3.2.1 contain a buffer overflow vulnerability in the Zlib::GzipReader. The zstream_buffer_ungets function prepends caller-provided bytes ahead of previously produced output but fails to guarantee the backing Ruby string has enough capacity before the memmove shifts the existing data. This can lead to memory corruption when the buffer length exceeds capacity. This issue has been fixed in versions 3.0.1, 3.1.2 and 3.2.3.

nvd CVSS4.0 1.7

Vulnerability type

CWE-120 Classic Buffer Overflow

CWE-131