Alibabacloud Nas Mount Diagnosis

• Outcome: Review
• Latest audit: Sep 16, 2026 · 9:47 AM UTC
• Version: 0.0.1

Overview

The skill is for Alibaba Cloud NAS troubleshooting, but it asks users to run unverified remote scripts and apply privileged, persistent system changes that are not clearly guarded.

Review before installing. Use narrowly scoped read-only Alibaba Cloud credentials, avoid running the downloaded scripts unless you can verify their source and contents, and treat all sudo, registry, service-enable, and SMB security-policy changes as administrator-approved remediations with documented rollback.

A.I.G

Vulnerability Patterns

• Remote Payload Retrieval and Execution: Fetches external code whose behavior can change after review
• Insecure Skill Coding Practices: Finds exploitable flaws such as hardcoded secrets or command injection
• Skill Instruction Hijacking: Alters the agent's session goals or safety constraints when the skill loads
• Agent Memory Poisoning: Writes attacker-controlled rules into memory that affect later sessions
• Embedded Malicious Code: Ships malicious scripts inside the skill and executes them locally

Findings (2)

T03 · Remote Payload Retrieval and Execution

Error

• Location: SKILL.md:139

Finding

Mutable Remote Diagnostic Scripts and CLI Plugins Are Executed Without Integrity Verification

Content

View full analysis

:/ /mnt ``` `SKILL.md:167-173`: ```powershell # Download inspection script Invoke-WebRequest -TimeoutSec 30 https://nas-client-tools.oss-cn-hangzhou.aliyuncs.com/windows_client/alinas_smb_windows_inspection.ps1 -OutFile alinas_smb_windows_inspection.ps1 # Run inspection script .\alinas_smb_windows_inspection.ps1 -MountAddress -Locale zh-CN ``` `references/nfs-linux-errors.md:91-101`: ```bash # Download wget https://nas-client-tools.oss-cn-hangzhou.aliyuncs.com/linux_client/check_alinas_nfs_mount.py -P /tmp/ # Execute (replace with actual mount target address and local path) python2.7 /tmp/check_alinas_nfs_mount.py file-system-id.region.nas.aliyuncs.com:/ /mnt ``` `references/smb-windows-errors.md:3-9`: ```powershell # Download inspection script Invoke-WebRequest https://nas-client-tools.oss-cn-hangzhou.aliyuncs.com/windows_client/alinas_smb_windows_inspection.ps1 -OutFile alinas_smb_windows_inspection.ps1 # Run inspection script .\alinas_smb_windows_inspection.ps1 -MountAddress -Locale zh-CN ``` ### Technical Analysis The Skill downloads Python and PowerShell programs from mutable external URLs and immediately instructs the operator to execute the ...[truncated 2750 chars]

Remediation

View remediation

T09 · Insecure Skill Coding Practices

Error

• Location: references/smb-windows-errors.md:76

Finding

SMB Remediation Persistently Disables Guest-Authentication and Signing Protections

Content

View full analysis

Remediation

View remediation

SkillSpector

Vulnerability Patterns

• Prompt Injection: Instruction Override, Hidden Instructions, Exfiltration Commands
• Data Exfiltration: External Transmission, Env Variable Harvesting, File System Enumeration
• Privilege Escalation: Excessive Permissions, Sudo/Root Execution, Credential Access
• System Prompt Leakage: Direct Leakage, Indirect Extraction, Tool-Based Exfiltration
• Rogue Agent: Self-Modification, Session Persistence

Findings (29)

Cloud Metadata Access

High

• Category: Server-Side Request Forgery
• Confidence: 85% confidence

Finding

Code accesses a cloud instance metadata endpoint (e.g. 169.254.169.254). A single request can return temporary IAM credentials, making this a high-value SSRF target for credential theft.

Content

Scanner excerpt · SKILL.md (reported line 292)May include surrounding context.

md

- Alibaba Cloud network connectivity detection (on-demand Ping probes)
- ICMP PMTUD error messages (Path MTU Discovery)
- SLB load balancer forwarding traffic (controlled by SLB's security group/ACL)
- MetaServer access (100.100.100.200, instance metadata service)

### Step 5: Output Diagnosis Report

Missing User Warnings

High

• Category: Not specified by scanner
• Confidence: 99% confidence

Finding

The guidance tells users to enable insecure guest authentication and disable SMB signing requirements to make mounts work, but it does not prominently warn that these changes reduce core Windows SMB security protections. This can expose systems to spoofing, tampering, unauthorized access, and downgrade-style attacks, especially in enterprise or shared network environments where SMB traffic may be intercepted or relayed.

Content

No source excerpt is available for this finding.

Direct Prompt Extraction

High

• Category: System Prompt Leakage
• Confidence: 85% confidence

Finding

Skill contains instructions that could directly expose system prompts, internal rules, or hidden instructions to users or external parties.

Content

Scanner excerpt · scripts/nas_mount_diagnose.py (reported line 143)May include surrounding context.

python

"access_group": access_group_name,
        "rules": rules_info,
    }
    return rules, result


def check_ecs_instance(instance_id, region):

Description-Behavior Mismatch

Medium

• Category: Not specified by scanner
• Confidence: 95% confidence

Finding

The skill explicitly claims it only performs read-only diagnostic operations, but elsewhere instructs running third-party scripts and commands that can modify the local host or persist configuration changes. This mismatch is dangerous because operators may grant elevated trust or execute steps under the false assumption that the procedure is non-invasive.

Content

No source excerpt is available for this finding.

Intent-Code Divergence

Medium

• Category: Not specified by scanner
• Confidence: 95% confidence

Finding

The file states there are no write operations, but later includes commands that append to config files, create directories, enable services, change registry settings, and restart systems. Such contradictions can mislead users into executing persistent system changes without appropriate review or change-control safeguards.

Content

No source excerpt is available for this finding.

Sudo/Root Execution

Medium

• Category: Privilege Escalation
• Confidence: 91% confidence

Finding

The skill instructs use of sudo mount and mkdir on the target host, which requires elevated privileges and changes system state. In a troubleshooting skill, privileged commands may be necessary, but presenting them without strong guardrails increases the risk of unintended modification or misuse on the wrong host or mount target.

Content

Scanner excerpt · SKILL.md (reported line 145)May include surrounding context.

md

If the auto script cannot locate the issue, proceed to manual troubleshooting. See `references/nfs-linux-errors.md`.

Manual troubleshooting checklist:
1. **Subdirectory mount check** — If the mount path includes a subdirectory (e.g. `:/data`, `:/share/subdir`) and the error is `access denied`, the most likely cause is the subdirectory does not exist. **This rule applies to both General Purpose and Extreme NAS**. Solution: first mount root directory `sudo mount ... <mount-target>:/ /mnt`, run `mkdir /mnt/<subdir>` to create it, then unmount and remount the subdirectory
2. **NFS client installation check** — Confirm `nfs-utils` (RHEL/CentOS) or `nfs-common` (Debian/Ubuntu) is installed
3. **Network connectivity** — `ping <mount-target-address>` to check network
4. **Port connectivity** — `telnet <mount-target-address> 2049` to check NFS port

Natural-Language Policy Violations

Medium

• Category: Not specified by scanner
• Confidence: 95% confidence

Finding

The example command hard-codes -Locale zh-CN, which imposes a specific language/locale choice in the skill instructions. This is a natural-language policy concern because the file does not offer an alternative locale or indicate that the user should opt in to Chinese output.

Content

No source excerpt is available for this finding.

Sudo/Root Execution

Medium

• Category: Privilege Escalation
• Confidence: 90% confidence

Finding

The Linux SMB workflow requires root/sudo privileges and a sudo mount -t cifs command, which performs privileged local operations rather than purely observational diagnostics. This expands the blast radius of mistakes and can alter system mounts or credentials handling on production instances.

Content

Scanner excerpt · SKILL.md (reported line 185)May include surrounding context.

3. Network connectivity — ping <mount-target-address> and telnet <mount-target-address> 445
4. VPC and account consistency
5. Permission group configuration
6. root/sudo privileges
7. Mount command correctness:

   bash

   sudo mount -t cifs //<mount-target-address>/myshare /mnt -o vers=2.0,guest,uid=0,gid=0,dir_mode=0755,file_mode=0755,mfsymlinks,cache=strict,rsize=1048576,wsize=1048576
   

Sudo/Root Execution

Medium

• Category: Privilege Escalation
• Confidence: 90% confidence

Finding

This finding again reflects privileged mount instructions in the SMB troubleshooting flow. While not inherently malicious, embedding root-level operational commands in a diagnostic skill makes the skill more dangerous if invoked automatically or by less experienced operators.

Content

Scanner excerpt · SKILL.md (reported line 188)May include surrounding context.

6. root/sudo privileges
7. Mount command correctness:

   bash

   sudo mount -t cifs //<mount-target-address>/myshare /mnt -o vers=2.0,guest,uid=0,gid=0,dir_mode=0755,file_mode=0755,mfsymlinks,cache=strict,rsize=1048576,wsize=1048576
   

8. SELinux settings
9. Mount connection limit — Maximum 1000 per file system

Sudo/Root Execution

Medium

• Category: Privilege Escalation
• Confidence: 96% confidence

Finding

The quick-reference table includes commands that append to kernel module configuration, run modprobe, modify registry settings, and restart ECS instances. These are persistent privileged changes; presenting them as quick fixes without safety boundaries can cause service disruption, misconfiguration, or unauthorized host changes.

Content

Scanner excerpt · SKILL.md (reported line 336)May include surrounding context.

md

| Error Message | Root Cause | Solution |
|--------------|-----------|----------|
| `mount.nfs: No such device` | sunrpc module misconfiguration | Fix `tcp_slot_table_entries` in `/etc/modprobe.d/sunrpc.conf`, run `modprobe sunrpc` |
| `mount: can't find ... in /etc/fstab` | Incorrect mount command format | Use correct `sudo mount -t nfs -o ...` command |
| `mount.nfs: Operation not permitted` (NFSv4) | ECS hostname conflict | Run `echo 'install nfs /sbin/modprobe --ignore-install nfs nfs4_unique_id=\`cat /sys/class/dmi/id/product_uuid\`' >> /etc/modprobe.d/nfs.conf`, restart ECS |
| `access denied by server while mounting .../<dir>` | Subdirectory does not exist | Mount root directory first, create subdirectory, then remount |
| `file handle error` (Windows NFS) | Locking registry key missing | Create DWORD `Locking` with value 1 in registry `ClientForNFS\...\Mount` |

Session Persistence

Medium

• Category: Rogue Agent
• Confidence: 93% confidence

Finding

systemctl enable remote-fs.target creates persistent startup behavior on the host, directly contradicting the skill's read-only framing. Persistence changes can survive troubleshooting sessions and affect future boots, which is risky if applied automatically or without change approval.

Content

Scanner excerpt · SKILL.md (reported line 349)May include surrounding context.

md

| Windows system error 1272 | Guest access blocked by security policy | Set registry `AllowInsecureGuestAuth` to 1 |
| Windows system error 3227320323 | Digital signing policy conflict | Disable "Microsoft network client: Digitally sign communications (always)" policy |
| Windows system error 1312 | PowerShell mount username error | Enter correct workgroup name and username |
| Auto-mount failure on boot (CentOS 7) | remote-fs.target not enabled | `systemctl enable remote-fs.target` |
| Windows NFS network error 1222 | NFS client not installed | Install NFS client |

## Important Notes

Sudo/Root Execution

Medium

• Category: Privilege Escalation
• Confidence: 70% confidence

Finding

Commands invoke sudo or root privileges. Verify this elevated access is necessary and justified.

Content

Scanner excerpt · references/nfs-linux-errors.md (reported line 21)May include surrounding context.

bash

# General Purpose NAS - NFS v3
sudo mount -t nfs -o vers=3,nolock,proto=tcp,rsize=1048576,wsize=1048576,hard,timeo=600,retrans=2,noresvport <mount-target-address>:/ /mnt

# General Purpose NAS - NFS v4
sudo mount -t nfs -o vers=4,minorversion=0,rsize=1048576,wsize=1048576,hard,timeo=600,retrans=2,noresvport <mount-target-address>:/ /mnt

Sudo/Root Execution

Medium

• Category: Privilege Escalation
• Confidence: 70% confidence

Finding

Commands invoke sudo or root privileges. Verify this elevated access is necessary and justified.

Content

Scanner excerpt · references/nfs-linux-errors.md (reported line 27)May include surrounding context.

bash

# General Purpose NAS - NFS v3
sudo mount -t nfs -o vers=3,nolock,proto=tcp,rsize=1048576,wsize=1048576,hard,timeo=600,retrans=2,noresvport <mount-target-address>:/ /mnt

# General Purpose NAS - NFS v4
sudo mount -t nfs -o vers=4,minorversion=0,rsize=1048576,wsize=1048576,hard,timeo=600,retrans=2,noresvport <mount-target-address>:/ /mnt

Sudo/Root Execution

Medium

• Category: Privilege Escalation
• Confidence: 70% confidence

Finding

Commands invoke sudo or root privileges. Verify this elevated access is necessary and justified.

Content

Scanner excerpt · references/smb-linux-requirements.md (reported line 38)May include surrounding context.

bash

# General Purpose NAS - NFS v3
sudo mount -t nfs -o vers=3,nolock,proto=tcp,rsize=1048576,wsize=1048576,hard,timeo=600,retrans=2,noresvport <mount-target-address>:/ /mnt

# General Purpose NAS - NFS v4
sudo mount -t nfs -o vers=4,minorversion=0,rsize=1048576,wsize=1048576,hard,timeo=600,retrans=2,noresvport <mount-target-address>:/ /mnt

Sudo/Root Execution

Medium

• Category: Privilege Escalation
• Confidence: 70% confidence

Finding

Commands invoke sudo or root privileges. Verify this elevated access is necessary and justified.

Content

Scanner excerpt · references/smb-linux-requirements.md (reported line 41)May include surrounding context.

bash

# General Purpose NAS - NFS v3
sudo mount -t nfs -o vers=3,nolock,proto=tcp,rsize=1048576,wsize=1048576,hard,timeo=600,retrans=2,noresvport <mount-target-address>:/ /mnt

# General Purpose NAS - NFS v4
sudo mount -t nfs -o vers=4,minorversion=0,rsize=1048576,wsize=1048576,hard,timeo=600,retrans=2,noresvport <mount-target-address>:/ /mnt

Session Persistence

Medium

• Category: Rogue Agent
• Confidence: 80% confidence

Finding

Skill establishes unauthorized persistence across sessions via cron jobs, startup scripts, or state files. Session persistence allows an attacker to maintain access beyond the current interaction.

Content

Scanner excerpt · references/nfs-linux-errors.md (reported line 61)May include surrounding context.

Solution A (Recommended):

bash

systemctl start remote-fs.target
systemctl enable remote-fs.target

Solution B (Temporary):

Missing User Warnings

Medium

• Category: Not specified by scanner
• Confidence: 97% confidence

Finding

The document instructs users to download and execute a remote Python script directly from the internet without any integrity verification, source validation, or review guidance. This creates a supply-chain risk: if the hosted script is modified, compromised, or replaced, users may execute attacker-controlled code on their systems during troubleshooting.

Content

No source excerpt is available for this finding.

Sudo/Root Execution

Medium

• Category: Privilege Escalation
• Confidence: 70% confidence

Finding

Commands invoke sudo or root privileges. Verify this elevated access is necessary and justified.

Content

Scanner excerpt · references/nfs-linux-errors.md (reported line 24)May include surrounding context.

md

| Operating System | Check Command | Installation Command |
|-----------------|--------------|---------------------|
| Ubuntu / Debian | `sudo apt list cifs-utils` | `sudo apt-get install -y cifs-utils` |
| RHEL / CentOS | `sudo yum list cifs-utils` | `sudo yum install -y cifs-utils` |
| OpenSUSE / SLES | `sudo zypper search -i cifs-utils` | `sudo zypper install -y cifs-utils` |
| CoreOS | `which mount.cifs` | — |

Sudo/Root Execution

Medium

• Category: Privilege Escalation
• Confidence: 70% confidence

Finding

Commands invoke sudo or root privileges. Verify this elevated access is necessary and justified.

Content

Scanner excerpt · references/nfs-linux-errors.md (reported line 49)May include surrounding context.

md

| Operating System | Check Command | Installation Command |
|-----------------|--------------|---------------------|
| Ubuntu / Debian | `sudo apt list cifs-utils` | `sudo apt-get install -y cifs-utils` |
| RHEL / CentOS | `sudo yum list cifs-utils` | `sudo yum install -y cifs-utils` |
| OpenSUSE / SLES | `sudo zypper search -i cifs-utils` | `sudo zypper install -y cifs-utils` |
| CoreOS | `which mount.cifs` | — |

Sudo/Root Execution

Medium

• Category: Privilege Escalation
• Confidence: 70% confidence

Finding

Commands invoke sudo or root privileges. Verify this elevated access is necessary and justified.

Content

Scanner excerpt · references/nfs-linux-errors.md (reported line 51)May include surrounding context.

md

| Operating System | Check Command | Installation Command |
|-----------------|--------------|---------------------|
| Ubuntu / Debian | `sudo apt list cifs-utils` | `sudo apt-get install -y cifs-utils` |
| RHEL / CentOS | `sudo yum list cifs-utils` | `sudo yum install -y cifs-utils` |
| OpenSUSE / SLES | `sudo zypper search -i cifs-utils` | `sudo zypper install -y cifs-utils` |
| CoreOS | `which mount.cifs` | — |

Sudo/Root Execution

Medium

• Category: Privilege Escalation
• Confidence: 70% confidence

Finding

Commands invoke sudo or root privileges. Verify this elevated access is necessary and justified.

Content

Scanner excerpt · references/nfs-linux-errors.md (reported line 52)May include surrounding context.

md

| Operating System | Check Command | Installation Command |
|-----------------|--------------|---------------------|
| Ubuntu / Debian | `sudo apt list cifs-utils` | `sudo apt-get install -y cifs-utils` |
| RHEL / CentOS | `sudo yum list cifs-utils` | `sudo yum install -y cifs-utils` |
| OpenSUSE / SLES | `sudo zypper search -i cifs-utils` | `sudo zypper install -y cifs-utils` |
| CoreOS | `which mount.cifs` | — |

Sudo/Root Execution

Medium

• Category: Privilege Escalation
• Confidence: 70% confidence

Finding

Commands invoke sudo or root privileges. Verify this elevated access is necessary and justified.

Content

Scanner excerpt · references/nfs-linux-errors.md (reported line 89)May include surrounding context.

md

| Operating System | Check Command | Installation Command |
|-----------------|--------------|---------------------|
| Ubuntu / Debian | `sudo apt list cifs-utils` | `sudo apt-get install -y cifs-utils` |
| RHEL / CentOS | `sudo yum list cifs-utils` | `sudo yum install -y cifs-utils` |
| OpenSUSE / SLES | `sudo zypper search -i cifs-utils` | `sudo zypper install -y cifs-utils` |
| CoreOS | `which mount.cifs` | — |

Sudo/Root Execution

Medium

• Category: Privilege Escalation
• Confidence: 70% confidence

Finding

Commands invoke sudo or root privileges. Verify this elevated access is necessary and justified.

Content

Scanner excerpt · references/nfs-linux-errors.md (reported line 90)May include surrounding context.

md

| Operating System | Check Command | Installation Command |
|-----------------|--------------|---------------------|
| Ubuntu / Debian | `sudo apt list cifs-utils` | `sudo apt-get install -y cifs-utils` |
| RHEL / CentOS | `sudo yum list cifs-utils` | `sudo yum install -y cifs-utils` |
| OpenSUSE / SLES | `sudo zypper search -i cifs-utils` | `sudo zypper install -y cifs-utils` |
| CoreOS | `which mount.cifs` | — |

Sudo/Root Execution

Medium

• Category: Privilege Escalation
• Confidence: 70% confidence

Finding

Commands invoke sudo or root privileges. Verify this elevated access is necessary and justified.

Content

Scanner excerpt · references/nfs-linux-errors.md (reported line 91)May include surrounding context.

md

| Operating System | Check Command | Installation Command |
|-----------------|--------------|---------------------|
| Ubuntu / Debian | `sudo apt list cifs-utils` | `sudo apt-get install -y cifs-utils` |
| RHEL / CentOS | `sudo yum list cifs-utils` | `sudo yum install -y cifs-utils` |
| OpenSUSE / SLES | `sudo zypper search -i cifs-utils` | `sudo zypper install -y cifs-utils` |
| CoreOS | `which mount.cifs` | — |

Sudo/Root Execution

Medium

• Category: Privilege Escalation
• Confidence: 70% confidence

Finding

Commands invoke sudo or root privileges. Verify this elevated access is necessary and justified.

Content

Scanner excerpt · references/smb-linux-requirements.md (reported line 24)May include surrounding context.

md

| Operating System | Check Command | Installation Command |
|-----------------|--------------|---------------------|
| Ubuntu / Debian | `sudo apt list cifs-utils` | `sudo apt-get install -y cifs-utils` |
| RHEL / CentOS | `sudo yum list cifs-utils` | `sudo yum install -y cifs-utils` |
| OpenSUSE / SLES | `sudo zypper search -i cifs-utils` | `sudo zypper install -y cifs-utils` |
| CoreOS | `which mount.cifs` | — |

Static analysis

No suspicious patterns detected.