CVE-2024-29976
Published: 04 June 2024
Summary
CVE-2024-29976 is a medium-severity Improper Privilege Management (CWE-269) vulnerability in Zyxel Nas326 Firmware. Its CVSS base score is 6.5 (Medium).
Operationally, ranked in the top 9.4% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
Deeper analysis
CVE-2024-29976 is an improper privilege management flaw in the show_allsessions command affecting Zyxel NAS326 firmware versions prior to V5.21(AAZF.17)C0 and NAS542 firmware versions prior to V5.21(ABAG.14)C0. The issue permits an authenticated user to retrieve session cookies belonging to a logged-in administrator account on the affected network-attached storage devices. It carries a CVSS 3.1 score of 6.5 and is labeled unsupported when assigned.
An authenticated attacker with low privileges can exploit the vulnerability over the network to obtain administrator session information, including cookies, thereby gaining unauthorized access to administrative functions without requiring user interaction.
Zyxel security advisories recommend upgrading NAS326 and NAS542 devices to the fixed firmware releases V5.21(AAZF.17)C0 and V5.21(ABAG.14)C0 respectively; the advisories also note that the products have reached end-of-life status and will receive no further updates.
The EPSS score rose from a low baseline to a peak of 0.0727 after disclosure before settling at the current value of 0.0568, indicating emerging exploitation interest that warrants renewed attention for any remaining exposed devices.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2024-26950
Vulnerability details
** UNSUPPORTED WHEN ASSIGNED ** The improper privilege management vulnerability in the command “show_allsessions” in Zyxel NAS326 firmware versions before V5.21(AAZF.17)C0 and NAS542 firmware versions before V5.21(ABAG.14)C0 could allow an authenticated attacker to obtain a logged-in administrator’s session information containing…
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cookies on an affected device.
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
Mitigating Controls
Likely Mitigating Controls AI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Policy addresses roles, responsibilities, and privilege management to prevent improper privilege assignments.
Access supervision ensures privileges are assigned and managed without improper escalation or retention.
Assigning group/role memberships and access authorizations (privileges) while reviewing accounts addresses improper privilege management.
Enforces proper privilege management by requiring all decisions through the verified reference monitor.
By mandating division of duties across roles, the control enforces proper privilege management and prevents a single entity from controlling an entire sensitive process.
Implements core proper privilege management by restricting to only required rights.
Policy requires training on privilege management and least privilege, making it harder to exploit improper privilege management weaknesses.
Training covers proper privilege management practices, making incorrect privilege assignments less likely.