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Date: Tue, 4 Sep 2018 04:31:11 -0400 (EDT)
From: Siddharth Sharma <siddharth@...hat.com>
To: oss-security@...ts.openwall.com
Subject: glusterfs: multiple flaws
Hello,
We were informed about several security flaws affecting glusterfs.
All of the following bugs were reported by Michael Hanselmann (hansmi.ch).
CVE count: 12
CVE-2018-10904
==============
It was found that glusterfs server does not properly sanitize file paths in the
"trusted.io-stats-dump" extended attribute which is used by the
"debug/io-stats" translator. An attacker can use this flaw to create files and
execute arbitrary code. To exploit this, the attacker would require sufficient
access to modify the extended attributes of files on a gluster volume.
CVE-2018-10907
==============
It was found that glusterfs server is vulnerable to mulitple stack based buffer
overflows due to functions in server-rpc-fopc.c allocating fixed size buffers
using 'alloca(3)'. An authenticated attacker could exploit this by mounting a
gluster volume and sending a string longer that the fixed buffer size to cause
crash or potential code execution.
CVE-2018-10911
==============
A flaw was found in dict.c:dict_unserialize function of glusterfs,
dic_unserialize function does not handle negative key length values. An attacker
could use this flaw to read memory from other locations into the stored dict
value.
CVE-2018-10913
==============
An information disclosure vulnerability was discovered in glusterfs server. An
attacker could issue a xattr request via glusterfs FUSE to determine the
existence of any file.
CVE-2018-10914
==============
It was found that an attacker could issue a xattr request via glusterfs FUSE to
cause gluster brick process to crash which will result in a remote denial of
service. If gluster multiplexing is enabled this will result in a crash of
multiple bricks and gluster volumes.
CVE-2018-10923
==============
It was found that the "mknod" call derived from mknod(2) can create files
pointing to devices on a glusterfs server node. An authenticated attacker could
use this to create an arbitrary device and read data from any device attached
to the glusterfs server node.
CVE-2018-10924
==============
It was discovered that fsync(2) system call in glusterfs client code leaks
memory. An authenticated attacker could use this flaw to launch a denial of
service attack by making gluster clients consume memory of the host machine.
CVE-2018-10926
==============
A flaw was found in RPC request using gfs3_mknod_req supported by glusterfs
server. An authenticated attacker could use this flaw to write files to an
arbitrary location via path traversal and execute arbitrary code on a glusterfs
server node.
CVE-2018-10927
==============
A flaw was found in RPC request using gfs3_lookup_req in glusterfs server. An
authenticated attacker could use this flaw to leak information and execute
remote denial of service by crashing gluster brick process.
CVE-2018-10928
==============
A flaw was found in RPC request using gfs3_symlink_req in glusterfs server
which allows symlink destinations to point to file paths outside of the gluster
volume. An authenticated attacker could use this flaw to create arbitrary
symlinks pointing anywhere on the server and execute arbitrary code on
glusterfs server nodes.
CVE-2018-10929
==============
A flaw was found in RPC request using gfs2_create_req in glusterfs server. An
authenticated attacker could use this flaw to create arbitrary files and
execute arbitrary code on glusterfs server nodes.
CVE-2018-10930
==============
A flaw was found in RPC request using gfs3_rename_req in glusterfs server. An
authenticated attacker could use this flaw to write to a destination outside
the gluster volume.
Respectfully,
-----------------------------------------------------------------
Siddharth Sharma / Red Hat Product Security / Key ID : 0xD9F6489A
Fingerprint : 6F04 C684 A49C E4CE 8148 E841 CD6F 8E55 D9F6 489A
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