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- Fixed pkexec Local Privilege Escalation aka pwnkit (CVE-2021-4034 bsc#1194568)

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CVE-2021-4034-pkexec-fix.patch

OBS-URL: https://build.opensuse.org/package/show/Base:System/polkit?expand=0&rev=167
This commit is contained in:
Marcus Meissner 2022-01-25 18:16:00 +00:00 committed by Git OBS Bridge
parent 090adf40aa
commit 947bf1c982
3 changed files with 74 additions and 1 deletions
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65
CVE-2021-4034-pkexec-fix.patch Normal file
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@ -0,0 +1,65 @@
--- a/src/programs/pkcheck.c
+++ a/src/programs/pkcheck.c
@@ -363,6 +363,12 @@ main (int argc, char *argv[])
local_agent_handle = NULL;
ret = 126;
+ if (argc < 1)
+ {
+ help();
+ exit(1);
+ }
+
/* Disable remote file access from GIO. */
setenv ("GIO_USE_VFS", "local", 1);
--- a/src/programs/pkexec.c
+++ a/src/programs/pkexec.c
@@ -488,6 +488,17 @@ main (int argc, char *argv[])
pid_t pid_of_caller;
gpointer local_agent_handle;
+
+ /*
+ * If 'pkexec' is called wrong, just show help and bail out.
+ */
+ if (argc<1)
+ {
+ clearenv();
+ usage(argc, argv);
+ exit(1);
+ }
+
ret = 127;
authority = NULL;
subject = NULL;
@@ -614,10 +625,10 @@ main (int argc, char *argv[])
path = g_strdup (pwstruct.pw_shell);
if (!path)
- {
+ {
g_printerr ("No shell configured or error retrieving pw_shell\n");
goto out;
- }
+ }
/* If you change this, be sure to change the if (!command_line)
case below too */
command_line = g_strdup (path);
@@ -636,7 +647,15 @@ main (int argc, char *argv[])
goto out;
}
g_free (path);
- argv[n] = path = s;
+ path = s;
+
+ /* argc<2 and pkexec runs just shell, argv is guaranteed to be null-terminated.
+ * /-less shell shouldn't happen, but let's be defensive and don't write to null-termination
+ */
+ if (argv[n] != NULL)
+ {
+ argv[n] = path;
+ }
}
if (access (path, F_OK) != 0)
{

6
polkit.changes
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@ -1,3 +1,9 @@
-------------------------------------------------------------------
Tue Jan 25 18:15:16 UTC 2022 - Marcus Meissner <meissner@suse.com>
- Fixed pkexec Local Privilege Escalation aka pwnkit (CVE-2021-4034 bsc#1194568)
CVE-2021-4034-pkexec-fix.patch
-------------------------------------------------------------------
Mon Dec 6 10:27:20 UTC 2021 - Dirk Müller <dmueller@suse.com>

4
polkit.spec
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@ -1,7 +1,7 @@
#
# spec file for package polkit
#
# Copyright (c) 2021 SUSE LLC
# Copyright (c) 2022 SUSE LLC
#
# All modifications and additions to the file contributed by third parties
# remain the property of their copyright owners, unless otherwise agreed
@ -38,6 +38,8 @@ Patch2: pkexec.patch
Patch3: polkit-keyinit.patch
# adjust path to polkit-agent-helper-1 (bsc#1180474)
Patch4: polkit-adjust-libexec-path.patch
# PATCH-FIX-UPSTREAM CVE-2021-4034-pkexec-fix.patch meissner@ -- bsc#1194568 VUL-0: CVE-2021-4034: polkit: pkexec Local Privilege Escalation aka pwnkit
Patch5: CVE-2021-4034-pkexec-fix.patch
BuildRequires: gcc-c++
BuildRequires: gtk-doc
BuildRequires: intltool