RSI.0007.05-26-98.SUN.LIBAUTH
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Repent Security Incorporated, RSI
[ http://www.repsec.com ]
*** RSI ALERT ADVISORY ***
--- [CREDIT] --------------------------------------------------------------
Matt Conover: Discovered vulnerability
Mark Zielinski: Author of advisory
--- [SUMMARY] -------------------------------------------------------------
Announced: Aug 4, 1998
Report code: RSI.0007.05-26-98.SUN.LIBAUTH
Report title: Sun Microsystem's library libauth
Vulnerability: Insufficient bounds checking
Vendor status: Vendor was contacted on May 26, 1998
Patch status: No patch currently available
Platforms: Solaris 2.2, 2.3, 2.4, 2.5, 2.5.1, 2.6
Vulnerable: Several libary functions in libauth have buffer overflows
Reference: http://www.repsec.com/advisories.html
Impact: If exploited, an attacker could potentially compromise
local root access on your server
--- [DETAILS] -------------------------------------------------------------
Problem: Two buffer overflows exist in Sun Microsystem's libauth
library.
When ia_open_session () is called, it copies both the
connecting hostname and username into seperate local
buffers with no bounds checking. ia_open_session ()
attempts to write the information passed to it into these
buffers to maintain utmpx information on the user logging
into the system. Because these buffers are set at a fixed
value of 257 bytes, it is possible to cause a buffer
overflow.
While overwriting the buffer, the attacker can manipulate
the stack and execute their own commands, possibly gaining
root access on the system.
Functions we have found vulnerable:
---------------------------------------------------
ia_open_session () : Copies information passed to it
into two local buffers which can
result in a buffer overflow.
Potentially vulnerable programs
----------------------------------------------------
1. login
2. in.ftpd
3. in.uucpd
4. rpc.rexd
These vulnerabilities are present in Sun Microsystems
Solaris 2.2, 2.3, 2.4 2.5, 2.5.1 and 2.6.
For more information on this type of attack, point your
web browsers to http://www.repsec.com/bofs.html.
--- [FIX] -----------------------------------------------------------------
Solution: No fixes are currently available.
--- [PATCH] ---------------------------------------------------------------
Solution: Wait for Sun Microsystems to release an official patch.
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Repent Security Incorporated (RSI)
13610 N. Scottsdale Rd.
Suite #10-326
Scottsdale, AZ 85254
E-mail: adviseat_private
WWW: http://www.repsec.com
FTP: ftp://ftp.repsec.com
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Copyright August 1998 RepSec, Inc.
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