CVE-2024-36016

Description

In the Linux kernel, the following vulnerability has been resolved: tty: n_gsm: fix possible out-of-bounds in gsm0_receive() Assuming the following: - side A configures the n_gsm in basic option mode - side B sends the header of a basic option mode frame with data length 1 - side A switches to advanced option mode - side B sends 2 data bytes which exceeds gsm->len Reason: gsm->len is not used in advanced option mode. - side A switches to basic option mode - side B keeps sending until gsm0_receive() writes past gsm->buf Reason: Neither gsm->state nor gsm->len have been reset after reconfiguration. Fix this by changing gsm->count to gsm->len comparison from equal to less than. Also add upper limit checks against the constant MAX_MRU in gsm0_receive() and gsm1_receive() to harden against memory corruption of gsm->len and gsm->mru. All other checks remain as we still need to limit the data according to the user configuration and actual payload size.

Gravité et risque d'exploitation

CVE-2024-36016 obtient un score CVSS de 7.8/10, soit une gravité élevée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.27 %, ce qui la place devant 17.3 % des CVE référencées.

Que faire ?

• Vérifiez si Linux (versions <=6.1.*, 6.10, 0, <4c267110fc110390704cc065edb9817fdd10ff54, <47388e807f85948eefc403a8a5fdc5b406a65d5a, <0fb736c9931e02dbc7d9a75044c8e1c039e50f04, <=5.10.*, <=6.6.*, 6.8.12, <=6.9.*, 5.10.219, 4.19.316, <=5.4.*, 6.6.33, <b229bc6c6ea9fe459fc3fa94fd0a27a2f32aca56, <=4.19.*, 5.4.278, 5.15.161, <2.6.35, <=6.8.*, <774d83b008eccb1c48c14dc5486e7aa255731350, 6.1.93, <f126ce7305fe88f49cdabc6db4168b9318898ea3, <=*, <=5.15.*, e1eaea46bb4020b38a141b84f88565d4603f8dd0, <46f52c89a7e7d2691b97a9728e4591d071ca8abc, 6.9.3, <9513d4148950b05bc99fa7314dc883cc0e1605e5, 2.6.35, <b890d45aaf02b564e6cae2d2a590f9649330857d) est présent sur votre parc.
• Appliquez le correctif ou la version corrigée indiqués dans les références de l'éditeur.
• À défaut de correctif, limitez l'exposition (filtrage réseau, désactivation du composant).
• Automatisez la détection : les agents CVE Heimdall (gratuits, open source) corrèlent l'inventaire de vos serveurs avec la base CVE.

Références

• https://git.kernel.org/stable/c/9513d4148950b05bc99fa7314dc883cc0e1605e5
• https://git.kernel.org/stable/c/b229bc6c6ea9fe459fc3fa94fd0a27a2f32aca56
• https://git.kernel.org/stable/c/0fb736c9931e02dbc7d9a75044c8e1c039e50f04
• https://git.kernel.org/stable/c/4c267110fc110390704cc065edb9817fdd10ff54
• https://git.kernel.org/stable/c/46f52c89a7e7d2691b97a9728e4591d071ca8abc
• https://git.kernel.org/stable/c/774d83b008eccb1c48c14dc5486e7aa255731350
• https://git.kernel.org/stable/c/f126ce7305fe88f49cdabc6db4168b9318898ea3
• https://git.kernel.org/stable/c/b890d45aaf02b564e6cae2d2a590f9649330857d
• https://git.kernel.org/stable/c/47388e807f85948eefc403a8a5fdc5b406a65d5a