Outbreak: Zimbra Collaboration Mboximport Vulnerability on Network

Rule ID

PH_RULE_ZimbraMboxImportVuln_Network

Default Status

Enabled

Description

Zimbra Collaboration Mboximport Vulnerability (CVE-2022-27925, CVE-2022-37042) detected on network

Severity

MITRE ATT&CK® Tactics

Privilege Escalation

Privilege Escalation consists of techniques that adversaries use to gain higher-level permissions on a system or network. Adversaries can often enter and explore a network with unprivileged access but require elevated permissions to follow through on their objectives. Common approaches are to take advantage of system weaknesses, misconfigurations, and vulnerabilities.

https://attack.mitre.org/tactics/TA0004

MITRE ATT&CK® Techniques

T1068

Exploitation for Privilege Escalation

Adversaries may exploit software vulnerabilities in an attempt to collect elevate privileges. An adversary takes advantage of a programming error in a program, service, or within the operating system software or kernel itself to execute adversary-controlled code. They will likely need to perform privilege escalation to include use of software exploitation to circumvent those restrictions.

https://attack.mitre.org/techniques/T1068

Impacts

Network

Data Source

FortiGate via Syslog, FortiProxy via Syslog

Detection

Correlation

Remediation Guidance

Check if the source is patched for the CVE associated with the event. If yes then remove the host from the network and patch immediately. If host is not scanned then determine if the host is running the affected version of the application. If yes then patch immediately, else it is likely a false positive.

Time Window

If the following pattern or patterns match an ingested event within the given time window in seconds, trigger an incident.

300 seconds

Trigger Conditions

If the following defined pattern/s occur within a 300 second time window.

threat

SubPattern Definitions

SubPattern Name: threat

This is the named definition of the event query, this is important if multiple subpatterns are defined to distinguish them.

SubPattern Query

This is the query logic that matches incoming events

eventType IN ("FortiGate-ips-signature-51994","FortiProxy-ips-signature-51994",Group@PH_SYS_EVENT_FortiGate_AV_Detected) AND ipsSignatureId IN (51994,10101477,10101326,10101454) AND (srcIpAddr IN (Group@PH_SYS_NETWORK_ENTERPRISE_INTERNAL_NET) OR (destIpAddr IN (Group@PH_SYS_NETWORK_ENTERPRISE_INTERNAL_NET) AND fwAction NOT IN ("deny","dropped","block","blocked","ban-ip","alert_deny")))

Group by Attributes

This defines how matching events are aggregated, only events with the same matching attribute values are grouped into one unique incident ID

srcIpAddr,destIpAddr

Aggregate Constraint

This is most typically a numerical constraint that defines when the rule should trigger an incident

COUNT(*) >= 1

Incident Attribute Mapping

This section defines which fields in matching raw events should be mapped to the incident attributes in the resulting incident.

The available raw event attributes to map are limited to the group by attributes and the aggregate event constraint fields for each subpattern

 srcIpAddr=threat.srcIpAddr,
destIpAddr=threat.destIpAddr,
incidentCount=threat.COUNT(*)

FortiSIEM Rules