CVE-2023-53331
Vulnérabilité élevée dans Linux (Linux)
Description
In the Linux kernel, the following vulnerability has been resolved: pstore/ram: Check start of empty przs during init After commit 30696378f68a ("pstore/ram: Do not treat empty buffers as valid"), initialization would assume a prz was valid after seeing that the buffer_size is zero (regardless of the buffer start position). This unchecked start value means it could be outside the bounds of the buffer, leading to future access panics when written to: sysdump_panic_event+0x3b4/0x5b8 atomic_notifier_call_chain+0x54/0x90 panic+0x1c8/0x42c die+0x29c/0x2a8 die_kernel_fault+0x68/0x78 __do_kernel_fault+0x1c4/0x1e0 do_bad_area+0x40/0x100 do_translation_fault+0x68/0x80 do_mem_abort+0x68/0xf8 el1_da+0x1c/0xc0 __raw_writeb+0x38/0x174 __memcpy_toio+0x40/0xac persistent_ram_update+0x44/0x12c persistent_ram_write+0x1a8/0x1b8 ramoops_pstore_write+0x198/0x1e8 pstore_console_write+0x94/0xe0 ... To avoid this, also check if the prz start is 0 during the initialization phase. If not, the next prz sanity check case will discover it (start > size) and zap the buffer back to a sane state. [kees: update commit log with backtrace and clarifications]
Gravité et risque d'exploitation
CVE-2023-53331 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 0.16 %, ce qui la place devant 4.9 % des CVE référencées.
Que faire ?
- Vérifiez si Linux (versions <4.19.295, <=6.1.*, <fe8c3623ab06603eb760444a032d426542212021, <89312657337e6e03ad6e9ea1a462bd9c158c85c8, 0, <4.21, 4.14.96, fffdbf586866e9500b53c9d4b061d3983720375a, <4.10, 30696378f68a9e3dad6bfe55938b112e72af00c2, <4.14.326, <fedecaeef88899d940b69368c996e8b3b0b8650d, <c807ccdd812d18985860504b503899f3140a9549, 4.19.295, 6.5.3, <=5.10.*, <=4.14.*, <25fb4e3402d46f425ec135ef6f09792a4c1b3003, 6.4.16, 5.0, 5.4.257, <f77990358628b01bdc03752126ff5f716ea37615, f250e4c562a3bd106575032666e9ef46f31231f8, <4.5, 6.6, <=5.4.*, 4.20.5, <5.0, <dc2f60de9a7d3efd982440117dab5579898d808c, <=4.19.*, 265242d82a3c6a8bd9120d06b4801f8d7ae9a346, <e972231db29b5d1dccc13bf9d5ba55b6979a69ed, 4.4.172, 5.15.132, 4.9.153, ec7f99261da9a20d63cbd273511a11a2efe698f2, 9e969ba431b46b1891c88cea36f722f3bfe8a180, 4.19.18, <e95d7a8a6edd14f8fab44c777dd7281db91f6ae2, 5.10.195, <=*, <=5.15.*, <=6.5.*, <3.19, 3.18.133, 4.14.326, 6.1.53, <=6.4.*, e1e3a46706bd4037e8b7407dc660ae6e05b8ac56) 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/89312657337e6e03ad6e9ea1a462bd9c158c85c8
- https://git.kernel.org/stable/c/c807ccdd812d18985860504b503899f3140a9549
- https://git.kernel.org/stable/c/e972231db29b5d1dccc13bf9d5ba55b6979a69ed
- https://git.kernel.org/stable/c/dc2f60de9a7d3efd982440117dab5579898d808c
- https://git.kernel.org/stable/c/fedecaeef88899d940b69368c996e8b3b0b8650d
- https://git.kernel.org/stable/c/e95d7a8a6edd14f8fab44c777dd7281db91f6ae2
- https://git.kernel.org/stable/c/f77990358628b01bdc03752126ff5f716ea37615
- https://git.kernel.org/stable/c/25fb4e3402d46f425ec135ef6f09792a4c1b3003
- https://git.kernel.org/stable/c/fe8c3623ab06603eb760444a032d426542212021