Coverage › CVE-2023-49103

CVE-2023-49103 Mapped Sigma

ownCloud graphapi Information Disclosure Vulnerability

Vendor / product

ownCloud — ownCloud graphapi

Description (CISA)

ownCloud graphapi contains an information disclosure vulnerability that can reveal sensitive data stored in phpinfo() via GetPhpInfo.php, including administrative credentials.

Added to KEV

2023-11-30

Due date

2023-12-21

Required action

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Known ransomware use

Unknown

CWE

none recorded by CISA

CISA notes

https://owncloud.com/security-advisories/disclosure-of-sensitive-credentials-and-configuration-in-containerized-deployments/
https://nvd.nist.gov/vuln/detail/CVE-2023-49103

Elsewhere

cve.org · NVD · CISA KEV · JSON

ATT&CK techniques · CTID Mappings Explorer, ATT&CK 16.1, KEV snapshot 2025-07-28

3 mapping objects across 3 techniques. exploitation technique states how the vulnerability is exploited; primary and secondary impact state what exploitation achieves. They are different claims and are labelled as such.

Detection chain · ATT&CK Enterprise v19.2 detection strategies, analytics, log sources

T1005 Data from Local System primary impact

• DET0380 Detection of Local Data Collection Prior to Exfiltration
  AN1070 Windows

  Adversaries collecting local files via PowerShell, WMI, or direct file API calls often include recursive file listings, targeted file reads, and temporary file staging.

  WinEventLog:Security EventCode=4688 → DC0032 Process Creation

  WinEventLog:Sysmon EventCode=11 → DC0039 File Creation

  Tunable: TargetFilePathRegex ParentProcessFilter
  AN1071 Linux

  Adversaries using bash scripts or tools to recursively enumerate user home directories, config files, or SSH keys.

  auditd:SYSCALL open → DC0055 File Access

  auditd:SYSCALL execve → DC0032 Process Creation

  Tunable: TimeWindow ScriptToolName
  AN1072 macOS

  Adversary use of bash/zsh or AppleScript to locate files and exfil targets like user keychains or documents.

  macos:unifiedlog process:spawn → DC0032 Process Creation

  fs:fsusage read/write → DC0055 File Access

  Tunable: UserContext TargetVolume
  AN1073 Network Devices

  Collection of device configuration via CLI commands (e.g., show running-config, copy flash, more), often followed by TFTP/SCP transfers.

  networkdevice:cli command logging → DC0064 Command Execution

  Tunable: CommandScope AuthenticatedUserList
  AN1074 ESXi

  Adversaries accessing datastore or configuration files via vim-cmd, esxcli, or SCP to extract logs, VMs, or host configurations.

  esxis:vmkernel Datastore Access → DC0055 File Access

  esxi:hostd Command Execution → DC0064 Command Execution

  Tunable: AccessPathRegex InteractiveShellUsage

Sigma rules tagged attack.t1005 (14)

T1190 Exploit Public-Facing Application exploitation technique

• DET0080 Exploit Public-Facing Application – multi-signal correlation (request → error → post-exploit process/egress)
  AN0219 Windows

  Adversary sends crafted HTTP/S (or other service) input to an Internet-facing app (IIS/ASP.NET, API, device portal). Chain: (1) abnormal request patterns to public endpoint → (2) elevated 4xx/5xx or unusual methods/paths → (3) server process (w3wp.exe/other service) spawns shell/LOLbins or loads non-standard modules → (4) optional outbound callback from the host/container.

  ApplicationLog:IIS IIS W3C logs in C:\inetpub\logs\LogFiles\W3SVC* (spikes in 5xx, RCE/SQLi/path traversal/JNDI patterns) → DC0038 Application Log Content

  WinEventLog:Sysmon EventCode=1 → DC0032 Process Creation

  WinEventLog:Sysmon EventCode=7 → DC0016 Module Load

  WinEventLog:Sysmon EventCode=3, 22 → DC0082 Network Connection Creation

  Tunable: PublicVIPs SuspiciousPatterns ErrorRateThreshold TimeWindow AllowedChildList
  AN0220 Linux

  Adversary exploits Apache/Nginx/app servers. Chain: (1) suspicious requests in access logs → (2) spike of 5xx or WAF blocks → (3) web server or interpreter (apache2/nginx/php-fpm/node/python) spawns /bin/sh, curl, wget, socat, or writes webshell → (4) outbound callback.

  ApplicationLog:WebServer /var/log/httpd/access_log, /var/log/apache2/access.log, /var/log/nginx/access.log with exploit indicators and burst errors → DC0038 Application Log Content

  auditd:SYSCALL execve → DC0032 Process Creation

  NSM:Flow HTTP payloads with SQLi/LFI/JNDI/deserialization indicators → DC0085 Network Traffic Content

  Tunable: WebProcList ChildToolList BurstThreshold TimeWindow
  AN0221 macOS

  Adversary targets macOS-hosted public services (e.g., nginx, node). Chain: suspicious inbound request → service crash/5xx → service spawns shell or writes file → new outbound connection.

  macos:unifiedlog App/web server logs ingested via unified logging or filebeat (nginx/apache/node). → DC0038 Application Log Content

  macos:unifiedlog exec events where web process starts a shell/tooling → DC0032 Process Creation

  NSM:Flow outbound egress from web host after suspicious request → DC0085 Network Traffic Content

  Tunable: ServiceList TimeWindow
  AN0222 Containers

  Adversary exploits containerized app via ingress or service. Chain: (1) suspicious request in ingress/app logs → (2) container process spawns a shell/exec/sidecar (kubectl exec/docker exec) → (3) egress to Internet or metadata service (169.254.169.254).

  ApplicationLog:Ingress Kubernetes NGINX/Envoy ingress controller logs with anomalous payloads and 5xx spikes → DC0038 Application Log Content

  docker:events Docker/Kubernetes audit of exec/attach (kubectl exec) or unexpected child processes inside container → DC0032 Process Creation

  NSM:Flow Requests towards cloud metadata or command & control from pod IPs → DC0085 Network Traffic Content

  Tunable: IngressNamespaces MetadataEndpoints TimeWindow
  AN0223 IaaS

  Adversary targets cloud-hosted public endpoints. Chain: (1) ALB/ELB/Cloud LB logs show exploit-like inputs or error spikes → (2) workload spawns shell or reaches metadata API → (3) egress to new external hosts.

  ALB:HTTPLogs AWS ALB/ELB/GCP/Azure Application Gateway HTTP logs with unusual methods, long URIs, serialized payloads, 4xx/5xx bursts → DC0085 Network Traffic Content

  AWS:VPCFlowLogs VPC/NSG flow logs for pod/instance egress to Internet or metadata → DC0078 Network Traffic Flow

  Tunable: LBProjects ErrorBurst
  AN0224 ESXi

  Adversary exploits exposed OpenSLP on ESXi or vCenter public endpoints. Chain: inbound request pattern to mgmt service → hostd/vpxd error/crash/restart → unexpected process behavior or datastore access → outbound callback.

  esxi:hostd /var/log/hostd.log anomalies (faults, crashes, restarts) around inbound connections → DC0038 Application Log Content

  NSM:Flow Connections to TCP 427 (SLP) or vCenter web services from untrusted sources → DC0085 Network Traffic Content

  Tunable: MgmtCIDR TimeWindow
  AN0225 Network Devices

  Adversary exploits public admin services on routers/firewalls/switches. Chain: anomalous HTTP/SNMP/SmartInstall inputs → device syslog errors/restarts → config changes/CLI spawn → egress to attacker C2.

  networkdevice:controlplane Syslog from edge devices with HTTP 500s on mgmt portal, SmartInstall events, unexpected CLI commands → DC0038 Application Log Content

  NSM:Flow NetFlow/sFlow for odd egress to Internet from mgmt plane → DC0085 Network Traffic Content

  Tunable: MgmtPorts TrustedAdmins

Sigma rules tagged attack.t1190 (149)

All 149 rules on the technique page →

T1552 Unsecured Credentials primary impact

• DET0412 Detect Access or Search for Unsecured Credentials Across Platforms
  AN1153 Windows

  Unusual access to bash history, registry credentials paths, or private key files by unauthorized or scripting tools, with correlated file and process activity.

  WinEventLog:Sysmon EventCode=11 → DC0039 File Creation

  WinEventLog:Security EventCode=4688 → DC0032 Process Creation

  WinEventLog:Sysmon EventCode=13, 14 → DC0063 Windows Registry Key Modification

  Tunable: TimeWindow SuspiciousProcessList
  AN1154 Linux

  Reading of sensitive files like .bash_history, /etc/shadow, or private key directories by unauthorized users or unusual processes.

  auditd:SYSCALL open/read system calls to ~/.bash_history or /etc/shadow → DC0055 File Access

  auditd:SYSCALL execution of tools like cat, grep, or awk on credential files → DC0064 Command Execution

  Tunable: SensitivePaths UserContext
  AN1155 macOS

  Unusual access to ~/Library/Keychains, ~/.bash_history, or Terminal command history by unauthorized processes or users.

  macos:unifiedlog read access to ~/Library/Keychains or history files by terminal processes → DC0055 File Access

  macos:unifiedlog execution of 'security', 'cat', or 'grep' commands accessing credential storage → DC0064 Command Execution

  Tunable: ProcessName TargetPath
  AN1156 SaaS

  Unusual web-based access or API scraping of password managers, single sign-on sessions, or credential sync services via browser automation or anomalous API tokens.

  saas:googleworkspace Accessed third-party credential management service → DC0002 User Account Authentication

  saas:zoom unusual web session tokens and automation patterns during login → DC0038 Application Log Content

  Tunable: TokenAnomalyThreshold AccessGeoLocation
  AN1157 Identity Provider

  Unauthorized API or console calls to retrieve or reset password credentials, download key material, or modify SSO settings.

  azure:signinlogs Reset password or download key from portal → DC0002 User Account Authentication

  AWS:CloudTrail GetSecretValue → DC0070 Cloud Service Metadata

  Tunable: SSOSettingScope SecretType
  AN1158 Containers

  Access to container image layers or mounted secrets (e.g., Docker secrets) by processes not tied to entrypoint or orchestration context.

  auditd:SYSCALL read of /run/secrets or docker volumes by non-entrypoint process → DC0055 File Access

  containerd:Events unusual process spawned from container image context → DC0032 Process Creation

  Tunable: EntrypointAllowlist VolumeMountPath
  AN1159 Network Devices

  Use of configuration backup utilities or CLI access to dump plaintext passwords, local user hashes, or SNMP strings.

  linux:syslog CLI access to 'show running-config', 'show password', or 'cat config.txt' → DC0064 Command Execution

  NSM:Flow large transfer from management IPs to unauthorized host → DC0085 Network Traffic Content

  Tunable: ManagementInterfaceIPs CommandPattern

Sigma rules tagged attack.t1552 (13)