RSI would like to address some errata regarding the recent
post and disclosure of one of our advisories.
1. When mailed to members on 5-14-98, 'libnsl' was scheduled
to be our third release. Delays in obtaining the patch
forced it to be pushed back. As far as public releases,
'libnsl' is #0005 (reference below)
2. Sun is still working on a patch. The only 'patch' that has
been supplied is a single libnsl replacement (in binary
format) for a single version of Solaris (2.5.1). After
further testing, it appears to have fixed the problems. RSI
was waiting for an official patch for all versions before
releasing this advisory.
3. The (now) public release of #0005 (sun.libnsl) is below.
Please reference this copy. The RSI web page (www.repsec.com)
will be updated shortly to reflect the release.
Thank you.
Brian Martin
RSI
-= official advisory =-
RSI.0005.05-14-98.SUN.LIBNSL
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Repent Security Incorporated, RSI
[ http://www.repsec.com ]
*** RSI ALERT ADVISORY ***
--- [CREDIT] --------------------------------------------------------------
Matt Conover: Discovered the vulnerabilities
Mark Zielinski: Author of advisory
--- [SUMMARY] -------------------------------------------------------------
Announced: May 14, 1998
Report code: RSI.0005.05-14-98.SUN.LIBNSL
Report title: Sun Microsystem's libnsl
Vulnerability: Insufficient bounds checking
Vendor status: Contacted, patch under development
Patch status: No patch available
Platforms: Solaris 2.2, 2.3, 2.4, 2.5, 2.5.1
Vulnerable: Several library functions in libnsl have buffer overflows
Reference: http://www.repsec.com/advisories.html
Impact: If exploited, an attacker could potentially compromise
both local and remote root access on your server
--- [DETAILS] -------------------------------------------------------------
Problem: Several buffer overflows exist in Sun Microsystem's libnsl
networking library.
While overwriting the buffer, the attacker can manipulate
the stack and execute their own commands, possibly gaining
root access on your server.
Functions we have found vulnerable:
Vulnerable key functions:
---------------------------------------------------
extract_secret () : Buffer overflows while copying
data into a local buffer
getkeys_nis () : Buffer overflows if key value
is larger then the buffer
getpublickey () : Calls getkeys_nis ()
getsecretkey () : Calls getkeys_nis ()
Vulnerable RPC functions:
----------------------------------------------------
authdes_seccreate () : Calls getpublickey ()
rpc_broadcast_exp () : Buffer overflow if allowed to
specify network protocol type
rpc_broadcast () : Calls rpc_broadcast_exp ()
clnt_create_timed () : Buffer overflow if allowed to
specify network protocol type
host2netname () : Buffer overflow while specifying
hostname.
getnetname () : Calls host2netname ()
clnt_create () : Calls clnt_create_timed ()
rpc_call () : Buffer overflow if allowed to
specify network protocol type
authdes_pk_seccreate () : Calls getnetname ()
Vulnerable NIS functions:
----------------------------------------------------
__nis_init_callback () : Calls getpublickey ()
__nis_core_lookup () : Buffer overflow while copying
paramaters into a local buffer
nis_make_rpchandle () : Calls host2netname ()
nis_dump_r () : Calls nis_make_rpchandle ()
nis_dump () : Calls nis_dump_r ()
__nis_auth2princ () : Buffer overflow while specifying
machine name
__nis_host2nis_server (): Buffer overflow while specifying
hostname
nis_name_of_r () : Buffer overflow while copying
paramaters into a local buffer
nis_old_data_r () : Buffer overflow while copying
paramaters into a local buffer
nis_list () : Calls __nis_core_lookup ()
nis_add () : Calls nis_nameops ()
nis_remove () : Calls nis_nameops ()
nis_modify () : Calls nis_nameops ()
nis_mkdir () : Calls nis_make_rpchandle ()
nis_rmdir () : Calls nis_make_rpchandle ()
Potentially vulnerable programs:
----------------------------------------------------
Calls vulnerable RPC functions:
1. nfs mount
2. nfs share
3. rpc.rexd
4. autofs
Calls vulnerable key functions:
1. chkey
2. keylogin
3. setkey
4. newkey
5. keyserv
6. libscheme
Calls vulnerable NIS functions:
1. rpc.nisd
2. rpc.nisdpasswdd
3. nisping
4. nisaddent
5. nisupdkeys
6. nisaddcred
7. sendmail
8. volcheck
9. vold
Calls vulnerable YP functions:
1. vacation
2. ypwhich
3. yppush
These vulnerabilities are present in Sun Microsystem's
Solaris 2.2, 2.3, 2.4, 2.5, and 2.5.1.
For more information on this type of attack, point your
web browsers to http://www.repsec.com/bofs.html.
--- [FIX] -----------------------------------------------------------------
Solution: No fix available.
--- [PATCH] ---------------------------------------------------------------
Solution: Sun Microsystem's has not released an official patch.
---------------------------------------------------------------------------
Repent Security Incorporated (RSI)
adviseat_private
13610 N. Scottsdale Rd.
Suite #10-326
Scottsdale, AZ
85254
[ http://www.repsec.com ]
---------------------------------------------------------------------------
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