Bug 1665847 (CVE-2019-6250) - CVE-2019-6250 zeromq: Integer overflow in zmq::v2_decoder_t::size_ready
Summary: CVE-2019-6250 zeromq: Integer overflow in zmq::v2_decoder_t::size_ready
Alias: CVE-2019-6250
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
Depends On: 1665849 1665848
Blocks: 1665850
TreeView+ depends on / blocked
Reported: 2019-01-14 09:20 UTC by Andrej Nemec
Modified: 2019-09-29 15:05 UTC (History)
6 users (show)

Fixed In Version: zeromq 4.3.1
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Clone Of:
Last Closed: 2019-01-16 02:11:46 UTC

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Description Andrej Nemec 2019-01-14 09:20:41 UTC
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).

Upstream issue:




Comment 1 Andrej Nemec 2019-01-14 09:21:16 UTC
Created zeromq tracking bugs for this issue:

Affects: epel-all [bug 1665849]
Affects: fedora-all [bug 1665848]

Comment 2 Siddharth Sharma 2019-01-15 05:28:03 UTC

This issue did not affect the versions of zeromq3 as shipped with Red Hat Ceph Storage 2 as this version does not ship code for version 2 decoder. zeromq3 version shipped in Red Hat Ceph Storage 2 only contains version 1 decoder which does not contain affected code.

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