AUSCERT External Security Bulletin Redistribution

                 ESB-97.075 -- Sun Security Bulletin #00143
			  Vulnerability in eeprom

                              25 June 1997


Sun Microsystems, Inc has released the following advisory concerning a
vulnerability in eeprom.  This vulnerability may allow non-privileged
users to gain privileged access, including root privileges.

The following security bulletin is provided as a service to AUSCERT's
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 		   Sun Microsystems, Inc. Security Bulletin
Bulletin Number:	#00143
Date: 			June 24 1997
Title:			Vulnerability in eeprom

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Permission is granted for the redistribution of this Bulletin, so long as 
the Bulletin is not edited and is attributed to Sun Microsystems. Portions 
may also be excerpted for re-use in other security advisories so long as 
proper attribution is included.

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.
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1.  Bulletins Topics

    Sun announces the release of patches for Solaris 2.5.1, 2.5, 2.4, and 2.3
    (SunOS 5.5.1, 5.5, 5.4, and 5.3), that relate to a vulnerability in the
    eeprom program.
    Sun strongly recommends that you install the patches listed in section 4 
    immediately on every affected system.
2.  Who is Affected
       Vulnerable:	SunOS versions 5.5.1, 5.5, 5.4, and 5.3 for SPARC only.
       Not vulnerable:	All other supported versions of SunOS
       The vulnerability is fixed in the upcoming release of Solaris.
3.  Understanding the Vulnerability

    The eeprom program changes or displays the values of parameters in EEPROM.
    The EEPROM (Electrically erasable programmable read-only memory) is a 
    non-volatile PROM that holds information about the current system 
    configuration, alternate boot paths, and other information. Due to 
    insufficient bounds checking on arguments passed to the eeprom program, 
    it is possible to overwrite the internal stack space of eeprom while it is 
    executing. Since eeprom has setgid bin permissions, this vulnerability may 
    allow non-privileged users to gain privileged access, including root 
4.  List of Patches

    The vulnerability in eeprom is fixed by the following patches:

        OS version              Patch ID
        ----------              --------
        SunOS 5.5.1             104795-01
        SunOS 5.5               104796-01
        SunOS 5.4               104798-01	
        SunOS 5.3               104797-01	

	Intel x86 systems do not have the eeprom program and are not
	affected by this vulnerability.

5.  Checksum Table

    The checksum table below shows the BSD checksums (SunOS 5.x: /usr/ucb/sum),
    SVR4 checksums (SunOS 5.x: /usr/bin/sum), and the MD5 digital signatures 
    for the above-mentioned patches that are available from:
    These checksums may not apply if you obtain patches from your answer

File Name	      BSD	      SVR4	       MD5
- ----------------   ---------   ---------    --------------------------------
104795-01.tar.Z   03357 150   64333 300    3004B44BE2742A51A593DE8B76679768
104796-01.tar.Z   12042 150   18119 299    92DA0C5513E191A4C3719B3EFFB1B935
104798-01.tar.Z   40939 166   63088 332    DD89275C55397A97C4B06D1E5037723F
104797-01.tar.Z   59061 165   27937 330    BE97B2DD42A890F4E736A323E3CD8A4A

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