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Changqing Li
14b3caec6a
CVE-2025-6019: A Local Privilege Escalation (LPE) vulnerability was found in libblockdev. Generally, the "allow_active" setting in Polkit permits a physically present user to take certain actions based on the session type. Due to the way libblockdev interacts with the udisks daemon, an "allow_active" user on a system may be able escalate to full root privileges on the target host. Normally, udisks mounts user-provided filesystem images with security flags like nosuid and nodev to prevent privilege escalation. However, a local attacker can create a specially crafted XFS image containing a SUID-root shell, then trick udisks into resizing it. This mounts their malicious filesystem with root privileges, allowing them to execute their SUID-root shell and gain complete control of the system. Refer: https://cdn2.qualys.com/2025/06/17/suse15-pam-udisks-lpe.txt Signed-off-by: Changqing Li <changqing.li@windriver.com> Signed-off-by: Armin Kuster <akuster808@gmail.com>
32 lines
1.3 KiB
Diff
32 lines
1.3 KiB
Diff
From b2e9c16c726f62e500241617f8f3a03aa658fbe3 Mon Sep 17 00:00:00 2001
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From: Thomas Blume <Thomas.Blume@suse.com>
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Date: Fri, 16 May 2025 14:27:10 +0200
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Subject: [PATCH] Don't allow suid and dev set on fs resize
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Fixes: CVE-2025-6019
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CVE: CVE-2025-6019
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Upstream-Status: Backport [ https://github.com/storaged-project/libblockdev/commit/46b54414f66e965e3c37f8f51e621f96258ae22e ]
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Signed-off-by: Changqing Li <changqing.li@windriver.com>
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---
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src/plugins/fs/generic.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/src/plugins/fs/generic.c b/src/plugins/fs/generic.c
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index 2b2180aa..60f7d75e 100644
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--- a/src/plugins/fs/generic.c
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+++ b/src/plugins/fs/generic.c
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@@ -661,7 +661,7 @@ static gchar* fs_mount (const gchar *device, gchar *fstype, gboolean read_only,
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"Failed to create temporary directory for mounting '%s'.", device);
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return NULL;
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}
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- ret = bd_fs_mount (device, mountpoint, fstype, read_only ? "ro" : NULL, NULL, &l_error);
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+ ret = bd_fs_mount (device, mountpoint, fstype, read_only ? "nosuid,nodev,ro" : "nosuid,nodev", NULL, &l_error);
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if (!ret) {
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g_propagate_prefixed_error (error, l_error, "Failed to mount '%s': ", device);
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g_rmdir (mountpoint);
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--
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2.34.1
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