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Description of problem:
sealert -l 9864c067-b7e7-406e-8e7c-2bf895c667be
SELinux is preventing /usr/sbin/xtables-multi from 'read, write' accesses on the file .
***** Plugin leaks (86.2 confidence) suggests *****************************
If you want to ignore xtables-multi trying to read write access the file, because you believe it should not need this access.
Then you should report this as a bug.
You can generate a local policy module to dontaudit this access.
Do
# grep /usr/sbin/xtables-multi /var/log/audit/audit.log | audit2allow -D -M mypol
# semodule -i mypol.pp
***** Plugin catchall (14.7 confidence) suggests **************************
If you believe that xtables-multi should be allowed read write access on the file by default.
Then you should report this as a bug.
You can generate a local policy module to allow this access.
Do
allow this access for now by executing:
# grep iptables /var/log/audit/audit.log | audit2allow -M mypol
# semodule -i mypol.pp
Additional Information:
Source Context system_u:system_r:iptables_t:s0
Target Context system_u:object_r:firewalld_tmpfs_t:s0
Target Objects [ file ]
Source iptables
Source Path /usr/sbin/xtables-multi
Port <Unknown>
Host (removed)
Source RPM Packages iptables-1.4.21-13.el7.x86_64
Target RPM Packages
Policy RPM selinux-policy-3.12.1-153.el7_0.11.noarch
Selinux Enabled True
Policy Type targeted
Enforcing Mode Enforcing
Host Name (removed)
Platform Linux (removed)
3.10.0-123.8.1.el7.x86_64 #1 SMP Mon Aug 11
13:37:49 EDT 2014 x86_64 x86_64
Alert Count 48
First Seen 2014-09-19 15:36:04 PDT
Last Seen 2014-10-10 10:04:04 PDT
Local ID 9864c067-b7e7-406e-8e7c-2bf895c667be
Raw Audit Messages
type=AVC msg=audit(1412960644.974:505): avc: denied { read write } for pid=1511 comm="ip6tables" path=2F6465762F73686D2F66666975614B66677A202864656C6574656429 dev="tmpfs" ino=20273 scontext=system_u:system_r:iptables_t:s0 tcontext=system_u:object_r:firewalld_tmpfs_t:s0 tclass=file
type=SYSCALL msg=audit(1412960644.974:505): arch=x86_64 syscall=execve success=yes exit=0 a0=12ec710 a1=12eded0 a2=146a840 a3=7fffe1b0bba0 items=2 ppid=830 pid=1511 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm=ip6tables exe=/usr/sbin/xtables-multi subj=system_u:system_r:iptables_t:s0 key=(null)
type=CWD msg=audit(1412960644.974:505): cwd=/
type=PATH msg=audit(1412960644.974:505): item=0 name=/sbin/ip6tables inode=16992821 dev=fd:03 mode=0100755 ouid=0 ogid=0 rdev=00:00 obj=system_u:object_r:iptables_exec_t:s0 objtype=NORMAL
type=PATH msg=audit(1412960644.974:505): item=1 name=(null) inode=1988 dev=fd:03 mode=0100755 ouid=0 ogid=0 rdev=00:00 obj=system_u:object_r:ld_so_t:s0 objtype=NORMAL
Hash: iptables,iptables_t,firewalld_tmpfs_t,file,read,write
Additional info:
Not sure if this is relevant, but I have applied the CIS recommendations (v1.0) for RHEL7. In particular, there is a suggestion of tmpfs being involved.
# mount | grep tmpfs
devtmpfs on /dev type devtmpfs (rw,nosuid,seclabel,size=498208k,nr_inodes=124552,mode=755)
tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev,seclabel)
tmpfs on /run type tmpfs (rw,nosuid,nodev,seclabel,mode=755)
tmpfs on /sys/fs/cgroup type tmpfs (rw,nosuid,nodev,noexec,seclabel,mode=755)
none on /run/shm type tmpfs (rw,nosuid,nodev,noexec,relatime,seclabel)
>>> base64.b16decode("2F6465762F73686D2F66666975614B66677A202864656C6574656429")
'/dev/shm/ffiuaKfgz (deleted)'
This is likely the NX bypass from libffi. firewalld probably uses libffi-generated proxies for girepository access.
For background on the NX bypass with page aliasing, see <http://www.akkadia.org/drepper/selinux-mem.html> (last section).
This is a libffi bug:
/* Open a temporary file name, and immediately unlink it. */
static int
open_temp_exec_file_name (char *name)
{
int fd = mkstemp (name);
if (fd != -1)
unlink (name);
return fd;
}
It should use mkostemp with O_CLOEXEC.
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://rhn.redhat.com/errata/RHBA-2016-2385.html
Description of problem: sealert -l 9864c067-b7e7-406e-8e7c-2bf895c667be SELinux is preventing /usr/sbin/xtables-multi from 'read, write' accesses on the file . ***** Plugin leaks (86.2 confidence) suggests ***************************** If you want to ignore xtables-multi trying to read write access the file, because you believe it should not need this access. Then you should report this as a bug. You can generate a local policy module to dontaudit this access. Do # grep /usr/sbin/xtables-multi /var/log/audit/audit.log | audit2allow -D -M mypol # semodule -i mypol.pp ***** Plugin catchall (14.7 confidence) suggests ************************** If you believe that xtables-multi should be allowed read write access on the file by default. Then you should report this as a bug. You can generate a local policy module to allow this access. Do allow this access for now by executing: # grep iptables /var/log/audit/audit.log | audit2allow -M mypol # semodule -i mypol.pp Additional Information: Source Context system_u:system_r:iptables_t:s0 Target Context system_u:object_r:firewalld_tmpfs_t:s0 Target Objects [ file ] Source iptables Source Path /usr/sbin/xtables-multi Port <Unknown> Host (removed) Source RPM Packages iptables-1.4.21-13.el7.x86_64 Target RPM Packages Policy RPM selinux-policy-3.12.1-153.el7_0.11.noarch Selinux Enabled True Policy Type targeted Enforcing Mode Enforcing Host Name (removed) Platform Linux (removed) 3.10.0-123.8.1.el7.x86_64 #1 SMP Mon Aug 11 13:37:49 EDT 2014 x86_64 x86_64 Alert Count 48 First Seen 2014-09-19 15:36:04 PDT Last Seen 2014-10-10 10:04:04 PDT Local ID 9864c067-b7e7-406e-8e7c-2bf895c667be Raw Audit Messages type=AVC msg=audit(1412960644.974:505): avc: denied { read write } for pid=1511 comm="ip6tables" path=2F6465762F73686D2F66666975614B66677A202864656C6574656429 dev="tmpfs" ino=20273 scontext=system_u:system_r:iptables_t:s0 tcontext=system_u:object_r:firewalld_tmpfs_t:s0 tclass=file type=SYSCALL msg=audit(1412960644.974:505): arch=x86_64 syscall=execve success=yes exit=0 a0=12ec710 a1=12eded0 a2=146a840 a3=7fffe1b0bba0 items=2 ppid=830 pid=1511 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm=ip6tables exe=/usr/sbin/xtables-multi subj=system_u:system_r:iptables_t:s0 key=(null) type=CWD msg=audit(1412960644.974:505): cwd=/ type=PATH msg=audit(1412960644.974:505): item=0 name=/sbin/ip6tables inode=16992821 dev=fd:03 mode=0100755 ouid=0 ogid=0 rdev=00:00 obj=system_u:object_r:iptables_exec_t:s0 objtype=NORMAL type=PATH msg=audit(1412960644.974:505): item=1 name=(null) inode=1988 dev=fd:03 mode=0100755 ouid=0 ogid=0 rdev=00:00 obj=system_u:object_r:ld_so_t:s0 objtype=NORMAL Hash: iptables,iptables_t,firewalld_tmpfs_t,file,read,write Additional info: Not sure if this is relevant, but I have applied the CIS recommendations (v1.0) for RHEL7. In particular, there is a suggestion of tmpfs being involved. # mount | grep tmpfs devtmpfs on /dev type devtmpfs (rw,nosuid,seclabel,size=498208k,nr_inodes=124552,mode=755) tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev,seclabel) tmpfs on /run type tmpfs (rw,nosuid,nodev,seclabel,mode=755) tmpfs on /sys/fs/cgroup type tmpfs (rw,nosuid,nodev,noexec,seclabel,mode=755) none on /run/shm type tmpfs (rw,nosuid,nodev,noexec,relatime,seclabel)