CVE-2018-25261 Overview
CVE-2018-25261 is a local buffer overflow vulnerability in Iperius Backup 5.8.1 that abuses the Windows Structured Exception Handling (SEH) mechanism. Local attackers can create a backup job containing a crafted file path in the external file location field. When the backup job executes, the oversized input overflows a stack buffer and overwrites the SEH record, redirecting execution to attacker-controlled code. Successful exploitation runs arbitrary code with the privileges of the Iperius Backup process. The flaw is tracked under CWE-787 (Out-of-Bounds Write).
Critical Impact
Local attackers can execute arbitrary code in the context of Iperius Backup by supplying a malicious file path through a backup job configuration.
Affected Products
- Enter Srl Iperius Backup 5.8.1
- Configurations using the external file location field in backup jobs
- Windows installations running the affected Iperius Backup release
Discovery Timeline
- 2026-04-22 - CVE-2018-25261 published to NVD
- 2026-04-29 - Last updated in NVD database
Technical Details for CVE-2018-25261
Vulnerability Analysis
The vulnerability exists in how Iperius Backup 5.8.1 processes file path strings provided in the external file location field of a backup job. The application copies the user-supplied path into a fixed-size stack buffer without enforcing length validation. Oversized input writes past the buffer boundary and overwrites the saved SEH record on the stack.
When the backup job triggers an exception during execution, the corrupted SEH handler pointer is dispatched. Attackers can replace the handler with the address of a POP POP RET gadget that pivots execution to a controlled shellcode payload stored in the same path string. The result is local code execution under the Iperius Backup process context.
Root Cause
The root cause is an out-of-bounds write [CWE-787] caused by missing bounds checks on the external file location parameter. The application relies on unsafe string-copy semantics rather than length-aware functions, leaving the stack frame and its SEH metadata exposed to overflow.
Attack Vector
Exploitation requires local access to the host with permission to configure or modify Iperius Backup jobs. The attacker crafts a payload that combines NOP padding, a SEH overwrite, and shellcode, then supplies it through the backup job's file path field. Executing the job triggers the overflow and transfers control to the payload. Technical exploitation details are published in Exploit-DB #46059 and the VulnCheck Advisory on Iperius Backup.
No verified code examples are available; refer to the linked advisories for the exploitation primitive and offsets.
Detection Methods for CVE-2018-25261
Indicators of Compromise
- Iperius Backup job configurations containing abnormally long file path strings or non-printable characters in the external file location field.
- Crashes or unexpected terminations of Iperius.exe recorded in Windows Application event logs with exception codes consistent with SEH abuse.
- Unexpected child processes spawned by Iperius Backup, especially command shells or scripting interpreters.
Detection Strategies
- Inspect Iperius Backup configuration files and XML job definitions for path fields exceeding expected length limits.
- Monitor process lineage for Iperius.exe and alert on creation of cmd.exe, powershell.exe, or other interpreters as child processes.
- Correlate Windows Error Reporting events for Iperius Backup with subsequent suspicious process or network activity on the host.
Monitoring Recommendations
- Enable PowerShell and Sysmon process-creation logging on hosts running Iperius Backup to capture exploitation artifacts.
- Track modifications to Iperius Backup job definitions and alert when non-administrative users edit them.
- Forward host telemetry to a centralized analytics platform to identify repeated crash-then-execute patterns indicative of SEH exploitation.
How to Mitigate CVE-2018-25261
Immediate Actions Required
- Upgrade Iperius Backup to the latest vendor-supported release available from the Iperius Backup Official Site.
- Restrict who can create or modify backup jobs to trusted administrators only.
- Audit existing backup job configurations for anomalous path values and remove suspicious entries.
Patch Information
No vendor advisory URL is listed in the CVE record. Consult the Iperius Backup Official Site for current releases and review the VulnCheck Advisory on Iperius Backup for fix guidance. Customers running version 5.8.1 should upgrade to a release later than the vulnerable build.
Workarounds
- Limit local logon and configuration access to the Iperius Backup host using least-privilege controls.
- Enforce application allow-listing to block unauthorized binaries spawned from Iperius.exe.
- Validate that Data Execution Prevention (DEP) and SafeSEH are enforced for the Iperius Backup process where supported.
# Configuration example: restrict Iperius Backup directory permissions on Windows
icacls "C:\Program Files (x86)\Iperius Backup" /inheritance:r
icacls "C:\Program Files (x86)\Iperius Backup" /grant:r "Administrators:(OI)(CI)F" "SYSTEM:(OI)(CI)F"
icacls "C:\Program Files (x86)\Iperius Backup" /remove "Users" "Authenticated Users"
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
