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c5a8cfd581
- CVE-2025-6020:
A flaw was found in linux-pam. The module pam_namespace may use access
user-controlled paths without proper protection, allowing local users
to elevate their privileges to root via multiple symlink attacks and
race conditions.
For more information, see:
- https://www.cve.org/CVERecord?id=CVE-2025-6020
This fix was backported based on the work of the OpenEmbedded
community. See the link to the original patches in the patch header.
(cherry picked from 30e38505e4)
Signed-off-by: Thomas Perale <thomas.perale@mind.be>
38 lines
1.6 KiB
Diff
38 lines
1.6 KiB
Diff
From 976c20079358d133514568fc7fd95c02df8b5773 Mon Sep 17 00:00:00 2001
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From: "Dmitry V. Levin" <ldv@strace.io>
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Date: Tue, 27 May 2025 08:00:00 +0000
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Subject: [PATCH] pam_namespace: secure_opendir: do not look at the group
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ownership
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When the directory is not group-writable, the group ownership does
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not matter, and when it is group-writable, there should not be any
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exceptions for the root group as there is no guarantee that the root
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group does not include non-root users.
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Upstream: https://github.com/linux-pam/linux-pam/commit/976c20079358d133514568fc7fd95c02df8b5773
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Signed-off-by: Hitendra Prajapati <hprajapati@mvista.com>
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Upstream: https://github.com/openembedded/openembedded-core/blob/scarthgap/meta/recipes-extended/pam/libpam/CVE-2025-6020-02.patch
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CVE: CVE-2025-6020
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[thomas: backport from OpenEmbedded patch to 1.6.1]
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Signed-off-by: Thomas Perale <thomas.perale@mind.be>
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---
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modules/pam_namespace/pam_namespace.c | 3 +--
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1 file changed, 1 insertion(+), 2 deletions(-)
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diff --git a/modules/pam_namespace/pam_namespace.c b/modules/pam_namespace/pam_namespace.c
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index 4c8153b..791dd07 100644
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--- a/modules/pam_namespace/pam_namespace.c
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+++ b/modules/pam_namespace/pam_namespace.c
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@@ -215,8 +215,7 @@ static int secure_opendir(const char *path, int opm, mode_t mode,
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if (dfd_next == -1)
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goto error;
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} else if (st.st_uid != 0
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- || (st.st_gid != 0 && (st.st_mode & S_IWGRP))
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- || (st.st_mode & S_IWOTH)) {
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+ || (st.st_mode & (S_IWGRP|S_IWOTH))) {
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/* do not follow symlinks on subdirectories */
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flags |= O_NOFOLLOW;
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}
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--
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2.49.0
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