Multiple vendor ypxfrd daemon file disclosure
| ypxfrd-file-disclosure (10329) |  Medium Risk |
Description:
A vulnerability in multiple vendor implementations of the ypxfrd daemon could allow a local or remote attacker to read any file on the system. When the getdbm procedure is called, an attacker could send map and domain arguments to the /var/yp/domain/map file that contain "dot" or "slash" characters, which would allow the attacker to gain access to databases outside of the /var/yp directory. An attacker could exploit this vulnerability to read any file on the server and possibly gain elevated privileges.
Platforms Affected:
- Compaq, Tru64 4.0f
- Compaq, Tru64 4.0g
- Compaq, Tru64 5.0a
- Compaq, Tru64 5.1
- Compaq, Tru64 5.1a
- HP, HP-UX 10.20
- HP, HP-UX 10.26
- HP, HP-UX 11.00
- HP, HP-UX 11.11
- HP, HP-UX 11.22
- SCO, Caldera OpenServer 5.0.5
- SCO, Caldera OpenServer 5.0.6
- Sun, Solaris 2.6
- Sun, Solaris 7.0
- Sun, Solaris 8
- Sun, Solaris 9
- Sun, Solaris
Remedy:
For HP Tru64 UNIX:
Apply the appropriate Early Release Patches (ERPs) for your system, as listed in Compaq SECURITY BULLETIN: SSRT2339 (ypxfrd) and SSRT2368 (ypserv) HP Tru64 UNIX Potential Security Vulnerability. See References.
For Caldera OpenServer 5.0.5 and 5.0.6:
Upgrade to the appropriate fixed binaries, as listed in Caldera International, Inc. Security Advisory CSSA-2002-SCO.40. See References.
For Sun Solaris:
Apply the appropriate patch for your system, as listed below. Refer to Sun Alert ID: 47903 for more information. See References.
SPARC:
Solaris 2.6: 108890-02 or later
Solaris 7: 106541-24 or later
Solaris 8: 109328-03 or later
Solaris 9: 113579-01 or later
X86:
Solaris 2.6: 108891-02 or later
Solaris 7: 106542-24 or later
Solaris 8: 109329-03 or later
For HP-UX:
Apply the appropriate patch for your system, as listed in HEWLETT-PACKARD COMPANY SECURITY BULLETIN: HPSBUX0401-306. See References.
For other distributions:
Contact your vendor for upgrade or patch information.
Consequences:
Obtain Information
References:
- BugTraq Mailing List, Thu Oct 10 2002 - 11:39:26 CDT, Multiple vendor ypxfrd map handling vulnerability at http://archives.neohapsis.com/archives/bugtraq/2002-10/0140.html.
- Caldera International, Inc. Security Advisory CSSA-2002-SCO.40, OpenServer 5.0.5 OpenServer 5.0.6 : ypxfrd remote file access vulnerability at ftp://ftp.caldera.com/pub/updates/OpenServer/CSSA-2002-SCO.40/CSSA-2002-SCO.40.txt.
- CIAC Information Bulletin O-046, HP 'ypxfrd' daemon Vulnerability at http://www.ciac.org/ciac/bulletins/o-046.shtml.
- Compaq SECURITY BULLETIN , SSRT2339 (ypxfrd) and SSRT2368 (ypserv) HP Tru64 UNIX Potential Security Vulnerability at http://archives.neohapsis.com/archives/bugtraq/2002-10/0136.html. (From Neohapsis archive)
- Sun Alert ID: 47903, Security Vulnerability in the ypserv(1M) and ypxfrd(1M) Daemons at http://sunsolve.sun.com/pub-cgi/retrieve.pl?doc=fsalert%2F47903&zone_32=47903.
- BID-5912: Multiple Platforms ypxfrd Remote File Disclosure Vulnerability
- BID-5937: ypxfrd Local File Disclosure Vulnerability
- CVE-2002-1199: The getdbm procedure in ypxfrd allows local users to read arbitrary files, and remote attackers to read databases outside /var/yp, via a directory traversal and symlink attack on the domain and map arguments.
- US-CERT VU#538033: ypxfrd daemon fails to properly validate user supplied arguments in getdbm procedure
Reported:
Oct 07, 2002
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