CVE-2024-24420
Published: 21 January 2025
Summary
CVE-2024-24420 is a high-severity Reachable Assertion (CWE-617) vulnerability in Linuxfoundation Magma. Its CVSS base score is 7.5 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 28.1th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and SI-11 (Error Handling).
Deeper analysis
CVE-2024-24420 is a reachable assertion vulnerability in the decode_linked_ti_ie function within Magma versions up to and including 1.8.0. Magma is an open-source software platform affected by this issue, which was published on 2025-01-21. The flaw, tied to CWE-617, enables attackers to trigger a Denial of Service (DoS) condition through a crafted NAS packet. It carries a CVSS v3.1 base score of 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).
The vulnerability can be exploited by any unauthenticated attacker with network access to the affected Magma instance, requiring low attack complexity and no user interaction. By sending a specially crafted NAS packet to the vulnerable decode_linked_ti_ie function, the attacker triggers a reachable assertion, causing the service to crash and disrupting availability without impacting confidentiality or integrity.
Mitigation is available in Magma v1.9 through commit 08472ba98b8321f802e95f5622fa90fec2dea486, which addresses the assertion failure. Security practitioners should upgrade to this fixed version. Additional details are provided in the advisory at https://cellularsecurity.org/ransacked.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2024-21839
Vulnerability details
A reachable assertion in the decode_linked_ti_ie function of Magma <= 1.8.0 (fixed in v1.9 commit 08472ba98b8321f802e95f5622fa90fec2dea486) allows attackers to cause a Denial of Service (DoS) via a crafted NAS packet.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Direct unauthenticated network exploitation of reachable assertion in decode_linked_ti_ie triggers application crash (DoS) via crafted NAS packet, mapping to public-facing app exploitation and application/system exploitation for availability impact.
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Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
SI-2 requires organizations to identify, report, and correct flaws like the reachable assertion in Magma's decode_linked_ti_ie function by applying the fix in v1.9.
SI-10 enforces validation of untrusted inputs such as crafted NAS packets to block those triggering the assertion failure.
SI-11 mandates error handling that does not compromise availability, preventing crashes from assertion failures on malformed linked TI IEs.