Signature Detail

APP: ZeroMQ libzmq v2_decoder Integer Overflow

This signature detects attempts to exploit a known vulnerability against ZeroMQ libzmq. A successful attack can lead to arbitrary code execution.

Extended Description

A pointer overflow, with code execution, was discovered in ZeroMQ libzmq (aka 0MQ) 4.2.x and 4.3.x before 4.3.1. A v2_decoder.cpp zmq::v2_decoder_t::size_ready integer overflow allows an authenticated attacker to overwrite an arbitrary amount of bytes beyond the bounds of a buffer, which can be leveraged to run arbitrary code on the target system. The memory layout allows the attacker to inject OS commands into a data structure located immediately after the problematic buffer (i.e., it is not necessary to use a typical buffer-overflow exploitation technique that changes the flow of control).

Affected Products

• Debian debian_linux 9.0
• Zeromq libzmq 4.2.0
• Zeromq libzmq 4.2.1
• Zeromq libzmq 4.2.2
• Zeromq libzmq 4.2.3
• Zeromq libzmq 4.2.4
• Zeromq libzmq 4.2.5
• Zeromq libzmq 4.3.0

References

• CVE: CVE-2019-6250
• URL: https://github.com/zeromq/libzmq/issues/3351
• URL: https://github.com/zeromq/libzmq/releases/tag/v4.3.1