PT-2017-4077 · Linux+3 · Linux Kernel+3
Bindecy
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Publicado
2017-11-27
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Atualizado
2023-06-26
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CVE-2017-1000405
CVSS v3.1
7.0
Alta
| Vetor | AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H |
Name of the Vulnerable Software and Affected Versions
Linux Kernel versions 2.6.38 through 4.14
Description
The issue is related to the
touch pmd() function in the Linux Kernel, which can be exploited due to incorrect synchronization when using a shared resource. This can allow an attacker to access confidential data, compromise its integrity, and cause a denial of service. The touch pmd() function can be reached by get user pages(), making the pmd dirty, which breaks the logic of can follow write pmd(). Although not as severe as the original "Dirty cow" issue, it still allows overwriting read-only huge pages, such as the zero huge page and sealed shmem files, since their mapping can be populated using THP.Recommendations
For Linux Kernel versions 2.6.38 through 4.14, consider disabling the
touch pmd() function or restricting its use until a patch is available to prevent exploitation. Additionally, avoid using THP for mapping sensitive data to minimize the risk of overwriting read-only huge pages. At the moment, there is no information about a newer version that contains a fix for this vulnerability.Exploit
Race Condition
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Enumeração de Fraquezas
Identificadores relacionados
Produtos afetados
Alt Linux
Linux Kernel
Suse
Ubuntu