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libblockdev: fix CVE-2025-6019

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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>
This commit is contained in:
Changqing Li 2025-07-03 15:52:50 +08:00 committed by Armin Kuster
parent 7f20709055
commit d2054d5887
2 changed files with 32 additions and 0 deletions
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31
meta-oe/recipes-extended/libblockdev/files/CVE-2025-6019.patch Normal file
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@ -0,0 +1,31 @@
From b2e9c16c726f62e500241617f8f3a03aa658fbe3 Mon Sep 17 00:00:00 2001
From: Thomas Blume <Thomas.Blume@suse.com>
Date: Fri, 16 May 2025 14:27:10 +0200
Subject: [PATCH] Don't allow suid and dev set on fs resize
Fixes: CVE-2025-6019
CVE: CVE-2025-6019
Upstream-Status: Backport [ https://github.com/storaged-project/libblockdev/commit/46b54414f66e965e3c37f8f51e621f96258ae22e ]
Signed-off-by: Changqing Li <changqing.li@windriver.com>
---
src/plugins/fs/generic.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/src/plugins/fs/generic.c b/src/plugins/fs/generic.c
index 2b2180aa..60f7d75e 100644
--- a/src/plugins/fs/generic.c
+++ b/src/plugins/fs/generic.c
@@ -661,7 +661,7 @@ static gchar* fs_mount (const gchar *device, gchar *fstype, gboolean read_only,
"Failed to create temporary directory for mounting '%s'.", device);
return NULL;
}
- ret = bd_fs_mount (device, mountpoint, fstype, read_only ? "ro" : NULL, NULL, &l_error);
+ ret = bd_fs_mount (device, mountpoint, fstype, read_only ? "nosuid,nodev,ro" : "nosuid,nodev", NULL, &l_error);
if (!ret) {
g_propagate_prefixed_error (error, l_error, "Failed to mount '%s': ", device);
g_rmdir (mountpoint);
--
2.34.1

1
meta-oe/recipes-extended/libblockdev/libblockdev_3.1.1.bb
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@ -14,6 +14,7 @@ DEPENDS = "autoconf-archive-native glib-2.0 kmod udev libnvme"
SRC_URI = "git://github.com/storaged-project/libblockdev;branch=3.1.x-devel;protocol=https \
file://0001-fix-pythondir-for-multilib-when-cross-compiling.patch \
file://CVE-2025-6019.patch \
"
SRCREV = "68aaff5556afe26be749c29a2b7cbd714dce3050"
S = "${WORKDIR}/git"