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Pardus About EUVDEUVD-2026-26236

| CVE-2026-5161 HIGH
Improper Link Resolution Before File Access (CWE-59)
2026-04-29 TR-CERT
8.8
CVSS 3.1 · Vendor: TR-CERT
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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

  1. Access
    Gain local access to Pardus host
  2. Delivery
    Plant symlink in target path
  3. Exploit
    Victim launches Pardus About
  4. Execution
    App follows link during privileged file op
  5. Impact
    Read or overwrite protected file

Vulnerability Assessment

Weakness
CWE
OWASP Top 10:2025
A01:2025 - Broken Access Control
ASVS 5.0
V5 - File Handling Symlink resolution safety
Exploitation Conditions

Exploitation requires the attacker to be able to create a symbolic link in a location that Pardus About accesses, and (per UI:R) requires user interaction - a victim launching or invoking the About application so the vulnerable file operation executes and follows the attacker's link; the impact is meaningful only when that operation runs at higher privilege than the attacker. Limiting factors: this is bounded to systems that actually run Pardus and the Pardus About utility (largely Turkish public-sector Linux deployments), it is version-limited to releases before v1.2.1, and CISA SSVC rates it non-automatable with no observed exploitation. The published AV:N (network) metric is inconsistent with a local symlink-planting prerequisite and should be confirmed with the vendor before treating this as remotely reachable.

Impact

Signals conflict and should temper the raw 8.8 score. CVSS declares AV:N/AC:L/PR:N/UI:R with full C/I/A impact, but the vulnerability class (symlink following in a local 'About' utility) and CISA SSVC (Automatable: no, Exploitation: none) point to a local, non-automatable issue rather than remote mass exploitation - the AV:N metric is questionable and should be verified with the vendor. Corroborating the lower real-world urgency: EPSS is 0.05% (14th percentile), the vulnerability is not in CISA KEV, and no public exploit is identified. SSVC does rate Technical Impact as 'total', so successful exploitation is serious where it applies, but the combination of no known exploitation, low automatability, required user interaction, and a niche product footprint makes this a moderate-priority patch item rather than an emergency, especially outside Pardus-based (largely Turkish public-sector) environments.

Exploit ScenarioDerived

A local user with a normal account plants a symbolic link at a path that Pardus About will operate on, then induces the required user interaction (e.g., launching or triggering the About utility). When the application resolves the link during a privileged file read or write, the operation is redirected to a sensitive system file, letting the attacker disclose or overwrite data outside their privilege level. No public exploit is identified at time of analysis, so this reflects the vulnerability class rather than a released POC.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).
No patch listed yet 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Jul 24, 2026

Local file tampering via symlink following in Pardus About (the 'About this system' utility of the TÜBİTAK BİLGEM Pardus Linux distribution) before v1.2.1 lets an attacker abuse improper link resolution (CWE-59) so that a privileged file operation is redirected to an attacker-chosen path. Reported by TR-CERT with SSVC technical impact rated 'total' and CVSS 8.8, though there is no public exploit identified at time of analysis and EPSS is very low (0.05%, 14th percentile). Note a signal conflict: the published vector is network (AV:N) yet a symlink attack in a local desktop utility strongly implies local access, which should be verified with the vendor.

RemediationAI

Vendor-released patch: v1.2.1 - upgrade Pardus About to v1.2.1 or later via the standard Pardus/APT package channels, which is the primary and authoritative fix. Consult the TR-CERT advisory at https://www.usom.gov.tr/bildirim/tr-26-0131 (mirror https://siberguvenlik.gov.tr/guvenlik-bildirimleri/detay/tr-26-0131) and https://vuldb.com/vuln/360159 for vendor details. Where immediate patching is not possible, apply compensating controls specific to symlink abuse: restrict write permissions on any directory the application reads from or writes to so untrusted local users cannot pre-place symlinks (trade-off: may break workflows that rely on shared temp/config paths), ensure the application is not run with unnecessary elevated privileges, and enable the kernel's protected-symlinks hardening (fs.protected_symlinks=1, and fs.protected_hardlinks=1) which blocks the classic sticky-directory symlink-follow pattern with minimal side effects on normal desktop use.

Affected VersionsENISA

Pardus About 0 <v1.2.1

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Technical ContextAI · show details

Pardus About is the system-information ('About') application shipped with Pardus, a Debian-based Linux distribution developed by TÜBİTAK BİLGEM Software Technologies Research Institute for Turkish public-sector use (CPE cpe:2.3:a:tubitak_bilgem_software_technologies_research_institute:pardus_about). The root cause is CWE-59, Improper Link Resolution Before File Access ('link following'): the application accesses a file by path without verifying that the path (or an intermediate directory component) is not an attacker-controlled symbolic link. If the operation runs with elevated privileges or targets a shared/predictable location, an attacker can pre-place a symlink so the read or write is silently redirected to a sensitive target file, defeating the intended access boundary.

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Severity by source

Vendor (TR-CERT) PRIMARY 8.8 HIGH
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
vuln.today AI 6.7 MEDIUM

Symlink planting needs local access (AV:L) and a low-priv account (PR:L); the follow requires a race/timing and victim action so AC:H and UI:R, with full local file impact.

3.1 AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H
4.0 AV:L/AC:H/AT:N/PR:L/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (TR-CERT).

CVSS VectorVendor: TR-CERT

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

DescriptionCVE.org

Improper link resolution before file access ('link following') vulnerability in TUBITAK BILGEM Software Technologies Research Institute Pardus About allows Symlink Attack.

This issue affects Pardus About: before v1.2.1.

Executive ViewAI

Why It Matters

CVE-2026-5161 affects Pardus About, the system information utility in TÜBİTAK BİLGEM's Pardus Linux distribution, allowing local attackers to redirect privileged file operations to arbitrary paths through symlink manipulation. Organizations running Pardus Linux versions before v1.2.1 risk unauthorized modification of system files and configurations that could compromise system integrity and control.

Business Impact: High
Compensating Controls

Restrict user permissions for symlink creation in working directories of Pardus About; apply strict filesystem ACLs to sensitive system files and configuration locations; enable filesystem auditing to detect unauthorized file access attempts; remove or disable Pardus About if not operationally critical until patched version is released.

Threat Intelligence Overview

EPSS Score
0.0%
Top 86% exploitable
Prevalence
Low
Utility of niche Pardus Linux distro, mainly Turkish public sector
Data Quality
6 sources
Confidence: High

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity HIGH
CISA KEV No
Public POC No
EPSS 0.0%
Patch available No
Active threat No
Deciding rule
HIGH severity (CVSS 7.0-8.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision
Scheduled
Exploitation
None
System Exposure· derived
Open
Automatable
No
Human Impact
High
Technical Impact
Total

Priority Score

44
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +44
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.

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