__________________________________________________________
The U.S. Department of Energy
Computer Incident Advisory Capability
___ __ __ _ ___
/ | /_\ /
\___ __|__ / \ \___
__________________________________________________________
INFORMATION BULLETIN
NFS clients rpc.pcnfsd Vulnerabilities
August 20, 1998 21:00 GMT Number I-088
______________________________________________________________________________
PROBLEM: Two vulnerabilities have been identified in pcnfsd, a Remote
Procedure Call used by NFS clients.
PLATFORM: Platforms running rpc.pcnfsd:
AIX: 4.0, 4.1, 4.2, 4.3
HP-UX: 7.x, 8.x, 9.x, 10.x, 11.x
SunOS: 4.1.3, 4.1.4
Solaris: 2.3, 2.4, 2.5, 2.5.1, 2.6
Redhat Linux: 4.0, 4.1, 4.2, 5.0, 5.1
Slackware Linux: 3.0, 3.1, 3.2, 3.3, 3.4, 3.5
OSF: 3.2
DAMAGE: If exploited, an attacker could gain root access.
SOLUTION: Apply patches or workarounds.
______________________________________________________________________________
VULNERABILITY If you are using rpc.pcnfsd, you should implement the
ASSESSMENT: workarounds or patches on all vulnerable systems as soon as
possible.
______________________________________________________________________________
[ Start RSI Advisory ]
RSI.0008.08-18-98.ALL.RPC_PCNFSD
|:::. |::::: |::::. |::::: |::::: |::::.
.. :: .. .. :: .. .. .. ::
|:::: |:::: |:::: :::::: |::::: |:::: |:
|: :: |: |: |:: |: |: ::
|: :: |::::: |: |::::: |::::: |:::::
Repent Security Incorporated, RSI
[ http://www.repsec.com ]
*** RSI ALERT ADVISORY ***
- --- [CREDIT] --------------------------------------------------------------
'Bermuda Brian': Research and development
Mark Zielinski : Author of advisory
- --- [SUMMARY] -------------------------------------------------------------
Announced: July 14, 1998
Report code: RSI.0008.08-18-98.ALL.RPC_PCNFSD
Report title: All rpc.pcnfsd
Vulnerability: Please see the details section
Vendor status: IBM contacted on August 3, 1998
Hewlett Packard contacted on August 3, 1998
Sun Microsystems contacted on August 3, 1998
Slackware contacted on August 3, 1998
Patch status: Linux and AIX patch information is provided below
Platforms: Vulnerable:
AIX: 4.0, 4.1, 4.2, 4.3
HP-UX: 7.x, 8.x, 9.x, 10.x, 11.x
SunOS: 4.1.3, 4.1.4
Solaris: 2.3, 2.4, 2.5, 2.5.1, 2.6
Redhat Linux: 4.0, 4.1, 4.2, 5.0, 5.1
Slackware Linux: 3.0, 3.1, 3.2, 3.3, 3.4, 3.5
OSF: 3.2
Not vulnerable:
OpenBSD, FreeBSD, NetBSD, BSDI
Reference: http://www.repsec.com/advisories.html
Impact: If exploited, an attacker could potentially compromise
root access both locally and remotely on your server
- --- [DETAILS] -------------------------------------------------------------
Description: PCNFSD is a Remote Procedure Call used by NFS clients.
This service provides username and password authentication
for networked computers which have installed NFS client
software.
Problem: Two vulnerabilities are covered in this advisory which
both allow root access to be compromised.
Vulnerable functions:
~~~~~~~~~~~~~~~~~~~~~
A. pr_init () : [CIAC HAS CHOSEN NOT TO INCLUDE FURTHER
DETAILS RE THIS VULNERABILITY]
B. run_ps630 () : [CIAC HAS CHOSEN NOT TO INCLUDE FURTHER
DETAILS RE THIS VULNERABILITY]
* Note : AIX is not vulnerable to problem A,
and HP is only vulnerable to function
A in HP-UX 9.0, 10.0.
- --- [FIX] -----------------------------------------------------------------
Solution: Disable rpc.pcnfsd until an appropriate patch is
released for your operating system.
- --- [AIX PATCH] -----------------------------------------------------------
AIX users: IBM has provided the following patches in
reponse to this vulnerability:
APAR 4.1.x: IX81505
APAR 4.2.x: IX81506
APAR 4.3.x: IX81507
Until the official APARs are available, a temporary
fix can be downloaded via anonymous ftp from:
ftp://aix.software.ibm.com/aix/efixes/security/pcnfsd.tar.Z
- --- [LINUX PATCH] ---------------------------------------------------------
Solution: Working in conjunction with Patrick Volkerding and the
Slackware Linux development staff, RSI has produced the
following patches:
ftp://ftp.repsec.com/pub/repsec/0008.patch1
WARNING! The code quoted below is only fragments of each
patch! You must download each patch for it to work correctly.
0008.patch1 replaces the character set that is considered
suspicious and replaces it with a list of characters that
are allowed. The following two lines show the change:
[snip...]
- - if(strpbrk(s, ";|&<>`'#!?*()[]^/") != NULL)
[snip...]
+ if (strspn(s, "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ-
_=:+1234567890@%,.")
[snip...]
---
ftp://ftp.repsec.com/pub/repsec/0008.patch2
0008.patch2 replaces the vulnerable code by removing the
chmod call, and utilizing umask. The following code fragments
have been stripped out of the patch to show the vulnerable
pieces of code and the relevant fix.
[snip...]
+ oldumask = umask(0);
+ (void)sprintf(pathname,"%s/%s",sp_name, sys);
+ (void)mkdir(sp_name, dir_mode); /* ignore the return code */
+ rc = mkdir(pathname, dir_mode); /* DON'T ignore this return code */
+ umask(oldumask);
[snip...]
- - (void)chmod(sp_name, dir_mode);
if((rc < 0 && errno != EEXIST) ||
- - (chmod(pathname, dir_mode) != 0) ||
(stat(pathname, &statbuf) != 0) ||
!(statbuf.st_mode & S_IFDIR)) {
(void)sprintf(tempstr,
- --- [OTHER PATCHES] -------------------------------------------------------
SunOS, Solaris, HPUX, and OSF users should wait
for their respective vendor to provide a patch.
- ---------------------------------------------------------------------------
Repent Security Incorporated (RSI)
13610 N. Scottsdale Rd.
Suite #10-326
Scottsdale, AZ 85254
E-Mail: advise@repsec.com
FTP: ftp://ftp.repsec.com
WWW: http://www.repsec.com
[End RSI Advisory ]
______________________________________________________________________________
CIAC wishes to acknowledge the contributions of Repent Security Incorporated
(RSI) for the information contained in this bulletin.
______________________________________________________________________________
CIAC, the Computer Incident Advisory Capability, is the computer
security incident response team for the U.S. Department of Energy
(DOE) and the emergency backup response team for the National
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