From a24567fbc43f221b14e805f9bc0b7c6d16911c46 Mon Sep 17 00:00:00 2001 From: Alex Legler Date: Sun, 8 Mar 2015 22:02:38 +0100 Subject: Import existing advisories --- glsa-200509-15.xml | 75 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 75 insertions(+) create mode 100644 glsa-200509-15.xml (limited to 'glsa-200509-15.xml') diff --git a/glsa-200509-15.xml b/glsa-200509-15.xml new file mode 100644 index 00000000..3e00dc8a --- /dev/null +++ b/glsa-200509-15.xml @@ -0,0 +1,75 @@ + + + + + + + util-linux: umount command validation error + + A command validation error in umount can lead to an escalation of + privileges. + + util-linux + September 20, 2005 + September 20, 2005: 01 + 105805 + local + + + 2.12q-r3 + 2.12q-r3 + + + +

+ util-linux is a suite of useful Linux programs including umount, a + program used to unmount filesystems. +

+
+ +

+ When a regular user mounts a filesystem, they are subject to + restrictions in the /etc/fstab configuration file. David Watson + discovered that when unmounting a filesystem with the '-r' option, the + read-only bit is set, while other bits, such as nosuid or nodev, are + not set, even if they were previously. +

+
+ +

+ An unprivileged user facing nosuid or nodev restrictions can + umount -r a filesystem clearing those bits, allowing applications to be + executed suid, or have device nodes interpreted. In the case where the + user can freely modify the contents of the filesystem, privilege + escalation may occur as a custom program may execute with suid + permissions. +

+
+ +

+ Two workarounds exist, first, the suid bit can be removed from the + umount utility, or users can be restricted from mounting and unmounting + filesystems in /etc/fstab. +

+
+ +

+ All util-linux users should upgrade to the latest version: +

+ + # emerge --sync + # emerge --ask --oneshot --verbose ">=sys-apps/util-linux-2.12q-r3" +
+ + CAN-2005-2876 + + + koon + + + r2d2 + + + koon + +
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