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author Patrick J Volkerding <volkerdi@slackware.com>2022-01-26 04:37:35 +0000
committer Eric Hameleers <alien@slackware.com>2022-01-26 08:59:56 +0100
commita733d591479391a9aaf78b2872e2afed5dc6658f (patch)
treeede0bbaae024cd509cfa56ed432ef50007db7fac /source/l/polkit
parent1269f459323b2536a51bb8c7e11cdffdebb185ef (diff)
downloadcurrent-a733d591479391a9aaf78b2872e2afed5dc6658f.tar.gz
current-a733d591479391a9aaf78b2872e2afed5dc6658f.tar.xz
Wed Jan 26 04:37:35 UTC 202220220126043735
l/polkit-0.120-x86_64-2.txz: Rebuilt. [PATCH] pkexec: local privilege escalation. Thanks to Qualys Research Labs for reporting this issue. For more information, see: https://blog.qualys.com/vulnerabilities-threat-research/2022/01/25/pwnkit-local-privilege-escalation-vulnerability-discovered-in-polkits-pkexec-cve-2021-4034 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-4034 (* Security fix *)
Diffstat (limited to 'source/l/polkit')
-rw-r--r--source/l/polkit/a2bf5c9c83b6ae46cbd5c779d3055bff81ded683.patch79
-rwxr-xr-xsource/l/polkit/polkit.SlackBuild5
2 files changed, 82 insertions, 2 deletions
diff --git a/source/l/polkit/a2bf5c9c83b6ae46cbd5c779d3055bff81ded683.patch b/source/l/polkit/a2bf5c9c83b6ae46cbd5c779d3055bff81ded683.patch
new file mode 100644
index 000000000..a06300a53
--- /dev/null
+++ b/source/l/polkit/a2bf5c9c83b6ae46cbd5c779d3055bff81ded683.patch
@@ -0,0 +1,79 @@
+From a2bf5c9c83b6ae46cbd5c779d3055bff81ded683 Mon Sep 17 00:00:00 2001
+From: Jan Rybar <jrybar@redhat.com>
+Date: Tue, 25 Jan 2022 17:21:46 +0000
+Subject: [PATCH] pkexec: local privilege escalation (CVE-2021-4034)
+
+---
+ src/programs/pkcheck.c | 5 +++++
+ src/programs/pkexec.c | 23 ++++++++++++++++++++---
+ 2 files changed, 25 insertions(+), 3 deletions(-)
+
+diff --git a/src/programs/pkcheck.c b/src/programs/pkcheck.c
+index f1bb4e1..768525c 100644
+--- a/src/programs/pkcheck.c
++++ b/src/programs/pkcheck.c
+@@ -363,6 +363,11 @@ main (int argc, char *argv[])
+ local_agent_handle = NULL;
+ ret = 126;
+
++ if (argc < 1)
++ {
++ exit(126);
++ }
++
+ /* Disable remote file access from GIO. */
+ setenv ("GIO_USE_VFS", "local", 1);
+
+diff --git a/src/programs/pkexec.c b/src/programs/pkexec.c
+index 7698c5c..84e5ef6 100644
+--- a/src/programs/pkexec.c
++++ b/src/programs/pkexec.c
+@@ -488,6 +488,15 @@ main (int argc, char *argv[])
+ pid_t pid_of_caller;
+ gpointer local_agent_handle;
+
++
++ /*
++ * If 'pkexec' is called THIS wrong, someone's probably evil-doing. Don't be nice, just bail out.
++ */
++ if (argc<1)
++ {
++ exit(127);
++ }
++
+ ret = 127;
+ authority = NULL;
+ subject = NULL;
+@@ -614,10 +623,10 @@ 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 +645,15 @@ 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)
+ {
+--
+GitLab
+
diff --git a/source/l/polkit/polkit.SlackBuild b/source/l/polkit/polkit.SlackBuild
index 61304ea21..13e1f948f 100755
--- a/source/l/polkit/polkit.SlackBuild
+++ b/source/l/polkit/polkit.SlackBuild
@@ -26,7 +26,7 @@ cd $(dirname $0) ; CWD=$(pwd)
PKGNAM=polkit
VERSION=${VERSION:-$(echo $PKGNAM-*.tar.?z | rev | cut -f 3- -d . | cut -f 1 -d - | rev)}
-BUILD=${BUILD:-1}
+BUILD=${BUILD:-2}
# Automatically determine the architecture we're building on:
if [ -z "$ARCH" ]; then
@@ -80,7 +80,8 @@ find . \
\( -perm 666 -o -perm 664 -o -perm 600 -o -perm 444 -o -perm 440 -o -perm 400 \) \
-exec chmod 644 {} \+
-zcat $CWD/dont-set-wheel-group-as-admin.diff.gz | patch -p1 || exit 1
+zcat $CWD/dont-set-wheel-group-as-admin.diff.gz | patch -p1 --verbose || exit 1
+zcat $CWD/a2bf5c9c83b6ae46cbd5c779d3055bff81ded683.patch.gz | patch -p1 --verbose || exit 1
# https://gitlab.freedesktop.org/polkit/polkit/-/issues/29
zcat $CWD/0001-configure-fix-elogind-support.patch.gz | patch -p1 || exit 1