MediumPublic exploit

Stack-Based Buffer Overflow in rsyslog parseLegacySyslogMsg

IdentifiersCVE-2011-3200CWE-121

CVE-2011-3200 is a stack-based buffer overflow in rsyslogd's parseLegacySyslogMsg function in tools/syslogd.c. rsyslog versions 4.6.x before 4.6.8 and versions 5.2.0 through 5.8.4 improperly handle an overly long TAG field in a legacy syslog message, allowing a remote attacker to terminate the rsyslogd application.

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

A remote attacker can cause rsyslogd to exit, resulting in denial of syslog message processing until the service is restarted.

Mitigation

If you can’t patch tonight, do this now.

If immediate upgrade is not possible, restrict syslog message acceptance to trusted sources only and avoid exposing syslog over the public Internet. Use TLS-protected syslog (RFC5424/5425) with mutual authentication for Internet-facing deployments. SELinux may provide additional mitigation by restricting the impact of a terminated rsyslogd process.

Remediation

Patch, then assume compromise.

Upgrade rsyslog 4.6.x installations to version 4.6.8 or later, and upgrade affected rsyslog 5.x installations to a version later than 5.8.4.

PUBLIC EXPLOITS

Exploits

1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.

VALID 1 / 1 TOTALView more in app

rsyslog_long_tag.rbMaturityWeaponizedFrameworkmetasploitVerified exploit

This repository contains a single Metasploit auxiliary module (modules/auxiliary/dos/syslog/rsyslog_long_tag.rb) that exploits an off-by-two overflow vulnerability (CVE-2011-3200) in the rsyslog daemon. The exploit works by sending a specially crafted syslog message with an excessively long tag field (512 '#' characters) over UDP to port 514 of the target. This can crash the rsyslog service, resulting in a denial of service. The module is not intended for code execution but for service disruption. The exploit targets rsyslog versions 4.6.0 to 4.6.7 and 5.8.0 to 5.8.4, primarily on Linux systems. The code is written in Ruby and is structured as a standard Metasploit auxiliary DoS module, with the main logic in the 'run' method. No hardcoded IP addresses or domains are present; the target is specified by the user.

Disclosed Sep 1, 2011rubynetwork

EXPOSURE SURFACE

Affected products & vendors

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VendorProductType

RsyslogRsyslogapplication

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ACTIVITY FEED

Recent activity

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0 SOURCESView more in app

No public activity observed for this vulnerability.

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Exposure mapping

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Threat actor evidence

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Associated malware

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Detection signatures

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Vendor-by-vendor mapping

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Social activity