PT-2018-17633 · Linux · Fscrypt
Mark
+1
·
Publicado
2018-08-23
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Atualizado
2021-06-23
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CVE-2018-6558
CVSS v3.1
6.5
Média
| Vetor | AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N |
Name of the Vulnerable Software and Affected Versions
fscrypt versions prior to 0.2.4
Description
The issue concerns the pam fscrypt module in fscrypt, which may incorrectly restore primary and supplementary group IDs to the values associated with the root user. This allows attackers to gain privileges via a successful login through certain applications that use Linux-PAM. Specifically, after dropping and then elevating process privileges, the euid, guid, and groups are not properly restored to their original values, allowing an unprivileged user to gain membership in the root group.
Recommendations
For versions prior to 0.2.4, update to version 0.2.4 or later to resolve the issue. As a temporary workaround, consider restricting the use of the pam fscrypt module until a patch is available. Avoid using applications that rely on Linux-PAM for authentication until the issue is resolved.
Correção
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Identificadores relacionados
Produtos afetados
Fscrypt