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CVE-2022-50563

Vulnérabilité non évaluée dans Linux (Linux)

CVSS 0.0 · Non évaluée
EPSS 0.2%
Linux•Linux•Versions : <=6.1.*, <3.2, 0, 4.14.303, <=4.9.*, 4.19.270, <34fe9c2251f19786a6689149a6212c6c0de1d63b, <=4.14.*, <=5.10.*, 5.15.87, <=6.0.*, 5.4.229, <e8b8e0d2bbf7d1172c4f435621418e29ee408d46, <=5.4.*, <=4.19.*, 3.2, 4.9.337, <550a4fac7ecfee5bac6a0dd772456ca62fb72f46, 6.1.4, 5.10.163, <88430ebcbc0ec637b710b947738839848c20feff, 991d9fa02da0dd1f843dc011376965e0c8c6c9b5, <94e231c9d6f2648d2f1f68e7f476e050ee0a6159, <=*, <34cd15d83b7206188d440b29b68084fcafde9395, <=5.15.*, <d9971fa4d8bde63d49c743c1b32d12fbbd3a30bd, 6.0.18, <7ee059d06a5d3c15465959e0472993e80fbe4e81, <7ae6aa649394e1e7f6dafb55ce0d578c0572a280, 6.2

Description

In the Linux kernel, the following vulnerability has been resolved: dm thin: Fix UAF in run_timer_softirq() When dm_resume() and dm_destroy() are concurrent, it will lead to UAF, as follows: BUG: KASAN: use-after-free in __run_timers+0x173/0x710 Write of size 8 at addr ffff88816d9490f0 by task swapper/0/0 <snip> Call Trace: <IRQ> dump_stack_lvl+0x73/0x9f print_report.cold+0x132/0xaa2 _raw_spin_lock_irqsave+0xcd/0x160 __run_timers+0x173/0x710 kasan_report+0xad/0x110 __run_timers+0x173/0x710 __asan_store8+0x9c/0x140 __run_timers+0x173/0x710 call_timer_fn+0x310/0x310 pvclock_clocksource_read+0xfa/0x250 kvm_clock_read+0x2c/0x70 kvm_clock_get_cycles+0xd/0x20 ktime_get+0x5c/0x110 lapic_next_event+0x38/0x50 clockevents_program_event+0xf1/0x1e0 run_timer_softirq+0x49/0x90 __do_softirq+0x16e/0x62c __irq_exit_rcu+0x1fa/0x270 irq_exit_rcu+0x12/0x20 sysvec_apic_timer_interrupt+0x8e/0xc0 One of the concurrency UAF can be shown as below: use free do_resume | __find_device_hash_cell | dm_get | atomic_inc(&md->holders) | | dm_destroy | __dm_destroy | if (!dm_suspended_md(md)) | atomic_read(&md->holders) | msleep(1) dm_resume | __dm_resume | dm_table_resume_targets | pool_resume | do_waker #add delay work | dm_put | atomic_dec(&md->holders) | | dm_table_destroy | pool_dtr | __pool_dec | __pool_destroy | destroy_workqueue | kfree(pool) # free pool time out __do_softirq run_timer_softirq # pool has already been freed This can be easily reproduced using: 1. create thin-pool 2. dmsetup suspend pool 3. dmsetup resume pool 4. dmsetup remove_all # Concurrent with 3 The root cause of this UAF bug is that dm_resume() adds timer after dm_destroy() skips cancelling the timer because of suspend status. After timeout, it will call run_timer_softirq(), however pool has already been freed. The concurrency UAF bug will happen. Therefore, cancelling timer again in __pool_destroy().

Gravité et risque d'exploitation

CVE-2022-50563 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 0.25 %, ce qui la place devant 15.1 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <=6.1.*, <3.2, 0, 4.14.303, <=4.9.*, 4.19.270, <34fe9c2251f19786a6689149a6212c6c0de1d63b, <=4.14.*, <=5.10.*, 5.15.87, <=6.0.*, 5.4.229, <e8b8e0d2bbf7d1172c4f435621418e29ee408d46, <=5.4.*, <=4.19.*, 3.2, 4.9.337, <550a4fac7ecfee5bac6a0dd772456ca62fb72f46, 6.1.4, 5.10.163, <88430ebcbc0ec637b710b947738839848c20feff, 991d9fa02da0dd1f843dc011376965e0c8c6c9b5, <94e231c9d6f2648d2f1f68e7f476e050ee0a6159, <=*, <34cd15d83b7206188d440b29b68084fcafde9395, <=5.15.*, <d9971fa4d8bde63d49c743c1b32d12fbbd3a30bd, 6.0.18, <7ee059d06a5d3c15465959e0472993e80fbe4e81, <7ae6aa649394e1e7f6dafb55ce0d578c0572a280, 6.2) 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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