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CVE-2023-52564

Vulnérabilité non évaluée dans Linux (Linux)

CVSS 0.0 · Non évaluée
EPSS 0.2%
Linux•Linux•Versions : 6.1.43, <=6.1.*, 5.10.190, 5.10.198, <2bff660e0ff349dee84dc4f6f6d10da4497f5b28, 9615ca54bc138e35353a001e8b5d4824dce72188, <6d5c8862932d31a810b6545f7d69ecc124402c6e, <6.5, <a48d2bcd23f2c98d575bc2f9b7a3fbd16aeea9eb, 9b9c8195f3f0d74a826077fc1c01b9ee74907239, 0, 6.5.6, 6.1.56, 74a8d6f50cc90ed0061997db51dfa81a62b0f835, 5138c228311a863c3cf937b94a3ab4c87f1f70c4, 6.5, <=5.10.*, <5.10.198, 5.15.124, 6.6, 5.15.134, <c61d0b87a7028c2c10faffc524d748334c7b9827, <5.15.134, 8fc0eabaa73bbd9bd705577071564616da5c8c61, 6.4.8, <=*, <=5.15.*, <=6.5.*, <6.1.56, <29346e217b8ab8a52889b88f00b268278d6b7668

Description

In the Linux kernel, the following vulnerability has been resolved: Revert "tty: n_gsm: fix UAF in gsm_cleanup_mux" This reverts commit 9b9c8195f3f0d74a826077fc1c01b9ee74907239. The commit above is reverted as it did not solve the original issue. gsm_cleanup_mux() tries to free up the virtual ttys by calling gsm_dlci_release() for each available DLCI. There, dlci_put() is called to decrease the reference counter for the DLCI via tty_port_put() which finally calls gsm_dlci_free(). This already clears the pointer which is being checked in gsm_cleanup_mux() before calling gsm_dlci_release(). Therefore, it is not necessary to clear this pointer in gsm_cleanup_mux() as done in the reverted commit. The commit introduces a null pointer dereference: <TASK> ? __die+0x1f/0x70 ? page_fault_oops+0x156/0x420 ? search_exception_tables+0x37/0x50 ? fixup_exception+0x21/0x310 ? exc_page_fault+0x69/0x150 ? asm_exc_page_fault+0x26/0x30 ? tty_port_put+0x19/0xa0 gsmtty_cleanup+0x29/0x80 [n_gsm] release_one_tty+0x37/0xe0 process_one_work+0x1e6/0x3e0 worker_thread+0x4c/0x3d0 ? __pfx_worker_thread+0x10/0x10 kthread+0xe1/0x110 ? __pfx_kthread+0x10/0x10 ret_from_fork+0x2f/0x50 ? __pfx_kthread+0x10/0x10 ret_from_fork_asm+0x1b/0x30 </TASK> The actual issue is that nothing guards dlci_put() from being called multiple times while the tty driver was triggered but did not yet finished calling gsm_dlci_free().

Gravité et risque d'exploitation

CVE-2023-52564 obtient un score CVSS de 0.0/10, soit une gravité non évaluée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.24 %, ce qui la place devant 14.1 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions 6.1.43, <=6.1.*, 5.10.190, 5.10.198, <2bff660e0ff349dee84dc4f6f6d10da4497f5b28, 9615ca54bc138e35353a001e8b5d4824dce72188, <6d5c8862932d31a810b6545f7d69ecc124402c6e, <6.5, <a48d2bcd23f2c98d575bc2f9b7a3fbd16aeea9eb, 9b9c8195f3f0d74a826077fc1c01b9ee74907239, 0, 6.5.6, 6.1.56, 74a8d6f50cc90ed0061997db51dfa81a62b0f835, 5138c228311a863c3cf937b94a3ab4c87f1f70c4, 6.5, <=5.10.*, <5.10.198, 5.15.124, 6.6, 5.15.134, <c61d0b87a7028c2c10faffc524d748334c7b9827, <5.15.134, 8fc0eabaa73bbd9bd705577071564616da5c8c61, 6.4.8, <=*, <=5.15.*, <=6.5.*, <6.1.56, <29346e217b8ab8a52889b88f00b268278d6b7668) 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

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