Heap Overflow in Rsyslog AIX Log Message Parser
CVE-2019-17041

9.8CRITICAL

Key Information:

Vendor

Rsyslog

Status
Rsyslog
Vendor
CVE Published:
7 October 2019

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2019-17041?

A vulnerability has been identified in Rsyslog's handling of AIX log message parsing, specifically in the contrib/pmaixforwardedfrom/pmaixforwardedfrom.c file in version 8.1908.0. The parser fails to correctly identify message delimiters, which can lead to a situation where the length of the message (lenMsg) is incorrectly determined as zero. Consequently, a lack of proper validation allows the parsing routine to treat invalid log messages as valid, leading to a heap overflow when attempting to manipulate message content. This flaw can potentially be exploited, leading to unexpected behavior or system instability.

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2019-17041
Created by Resery

References

https://github.com/rsyslog/rsyslog/blob/v8-stable/ChangeLog
x_refsource_CONFIRM
https://github.com/rsyslog/rsyslog/pull/3884
x_refsource_CONFIRM
http://lists.opensuse.org/opensuse-security-announce/2019...
vendor-advisoryx_refsource_SUSE

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

.