EUVD-2026-65492
GHSA-jhqm-m4j3-wqq2
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
AV:L because the malicious archive must be present locally; PR:N because archive crafting requires no privileges; UI:R because a privileged operator must invoke sos clean on the archive.
Primary rating from Vendor (redhat).
CVSS VectorNVD
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Lifecycle Timeline
3DescriptionNVD
A flaw was found in sos clean, a utility within the sos package. This vulnerability allows a local attacker to perform arbitrary file creation or overwrite. By crafting a malicious tar archive, an attacker can exploit a path traversal issue during tar extraction, where symlink and hardlink targets are not properly validated. This enables the attacker to write files to arbitrary locations on the system with the privileges of the sos clean process, which often runs as root.
AnalysisAI
Arbitrary file write via path traversal in the sos clean utility allows a local attacker to overwrite or create files at any location on the system by supplying a crafted tar archive to a privileged operator. The vulnerability exists across all supported Red Hat Enterprise Linux versions (6 through 10) and stems from sos clean's use of Python's fully_trusted_filter (or its legacy equivalent) during tar extraction, which performs no validation of symlink or hardlink targets - permitting escape from the intended extraction directory. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that an attacker supply a specially crafted tar archive and that a privileged user (typically root) processes that archive using the sos clean command. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score of 7.8 (AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H) reflects a realistic threat model: the attacker crafts a malicious archive (no privileges required) and must induce a privileged user to process it with sos clean (UI:R). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker with the ability to supply a sosreport tar archive to a system administrator persuades or tricks the administrator into running sos clean on the malicious archive as root. The archive contains a symlink member pointing to /etc and a subsequent file member under the same relative path; during extraction, sos clean follows the symlink and writes the attacker-controlled file content to /etc/cron.d/backdoor or /etc/sudoers.d/pwned, achieving persistent privilege escalation. … |
| Remediation | The upstream fix is available as GitHub PR #4461 (https://github.com/sosreport/sos/pull/4461), which replaces the fully_trusted_filter extraction path with a hardened _make_safer_extract_filter that validates both member paths and symlink/hardlink targets against the destination directory. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: audit all systems running sos to identify which users have execution permissions; restrict sos clean access via sudoers to only essential administrators and require documented approval for diagnostic collection. …
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External POC / Exploit Code
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