CVE-2026-18915 Overview
CVE-2026-18915 is an information disclosure vulnerability in TÜBİTAK BİLGEM Software Technologies Research Institute eta-otp-lock versions before 1.0.4. The flaw is classified under [CWE-214: Invocation of Process Using Visible Sensitive Information]. A local attacker with low privileges can observe sensitive process arguments during invocation, enabling system footprinting. The issue requires user interaction and impacts confidentiality only, with no integrity or availability effects.
Critical Impact
A local, low-privileged user can read sensitive information exposed in process invocations of eta-otp-lock prior to version 1.0.4, aiding reconnaissance and follow-on attacks against the host.
Affected Products
- TÜBİTAK BİLGEM Software Technologies Research Institute eta-otp-lock versions prior to 1.0.4
Discovery Timeline
- 2026-08-06 - CVE-2026-18915 published to NVD
- 2026-08-06 - Last updated in NVD database
Technical Details for CVE-2026-18915
Vulnerability Analysis
The vulnerability resides in how eta-otp-lock invokes child processes. Sensitive information is passed through command-line arguments or otherwise exposed in a manner visible to other local users. On multi-user systems, process arguments are typically observable through interfaces such as /proc/<pid>/cmdline on Linux or the process list on other operating systems. A local user monitoring these interfaces can capture the exposed values.
The advisory categorizes the resulting impact as system footprinting. Attackers can collect configuration data, identifiers, or authentication-related material that is not intended for other local principals. This information supports subsequent privilege escalation or targeted attacks against the affected host.
The vulnerability requires local access with low privileges and user interaction, and the scope is unchanged. Confidentiality is impacted; integrity and availability are not.
Root Cause
The root cause is improper handling of sensitive data during process invocation, mapped to [CWE-214]. Rather than passing secrets through file descriptors, environment isolation, or in-memory channels, the application exposes them in a location readable by other local processes. Any user able to enumerate processes on the host can capture the values.
Attack Vector
Exploitation is local. An attacker with an account on the same host runs a monitoring loop against the process table while a legitimate user launches or interacts with eta-otp-lock. The attacker records the exposed arguments and reconstructs the sensitive information. Because user interaction is required, the attacker relies on legitimate use of the software to trigger the disclosure.
No verified public exploit code is available. Refer to the Siber Güvenlik Notification TR-26-0753 for advisory details.
Detection Methods for CVE-2026-18915
Indicators of Compromise
- Presence of eta-otp-lock binaries with version identifiers below 1.0.4 on endpoints.
- Local processes that repeatedly enumerate /proc/<pid>/cmdline, run ps with wide output flags, or poll process listings at high frequency.
- Unexpected shell scripts or scheduled tasks scraping process metadata into user-writable files.
Detection Strategies
- Inventory installed versions of eta-otp-lock across managed hosts and flag any instance below 1.0.4.
- Alert on non-administrative accounts issuing repeated reads against process command-line files or running ps in a tight loop.
- Correlate eta-otp-lock process starts with concurrent process-list enumeration by other local users.
Monitoring Recommendations
- Enable process command-line auditing so invocations of eta-otp-lock and adjacent monitoring tools are logged centrally.
- Retain endpoint telemetry that captures parent-child process relationships and command-line arguments for forensic review.
- Review multi-user hosts running eta-otp-lock for unnecessary interactive accounts that could observe process activity.
How to Mitigate CVE-2026-18915
Immediate Actions Required
- Upgrade eta-otp-lock to version 1.0.4 or later on every affected system.
- Restrict local shell access on hosts running eta-otp-lock to trusted administrative users only.
- Audit historical process telemetry for evidence of prior enumeration targeting eta-otp-lock invocations.
Patch Information
The vendor has addressed the issue in eta-otp-lock version 1.0.4. Consult the Siber Güvenlik Notification TR-26-0753 for the official advisory and update guidance.
Workarounds
- Limit interactive and remote local access to hosts running vulnerable eta-otp-lock versions until the patch is applied.
- Where supported by the operating system, harden /proc visibility using options such as hidepid=2 to prevent unprivileged users from viewing other users' process arguments.
- Avoid launching eta-otp-lock on shared multi-user systems until upgraded to 1.0.4.
# Configuration example: restrict /proc visibility on Linux hosts
# Add to /etc/fstab to hide other users' process details
proc /proc proc defaults,hidepid=2,gid=proc 0 0
# Apply immediately without reboot
sudo mount -o remount,hidepid=2,gid=proc /proc
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
