user-ppp command_Expand_Interpret() buffer overflow
| userppp-commandexpandinterpret-bo (41034) |  High Risk |
Description:
The user-ppp command, as used in FreeBSD, OpenBSD, and NetBSD, is vulnerable to a stack-based buffer overflow, caused by improper bounds checking by the command_Expand_Interpret() function. By sending a specially-crafted string via the user-ppp command, a local attacker with network group privileges granted could overflow a buffer and execute arbitrary code on the system with root privileges or cause the application to crash.
Platforms Affected:
- FreeBSD, FreeBSD 6.3
- NetBSD, NetBSD
- OpenBSD, OpenBSD
Remedy:
For OpenBSD:
Apply the patch for this vulnerability, available from the OpenBSD CVS repository. See References.
For other distributions:
Apply the appropriate update for your system. See References.
Consequences:
Gain Privileges
References:
- BugTraq Mailing List, BugTraq Mailing List, Feb 26 2006 12:53PM, BSD user-ppp local root (when conditions permit) at http://www.securityfocus.com/archive/82/488980/30/0/threaded.
- FreeBSD Web site, The FreeBSD Project at http://www.freebsd.org/.
- NetBSD Web site, The NetBSD Project at http://www.netbsd.org/.
- OpenBSD CVS repository, OpenBSD at http://www.openbsd.org/cgi-bin/cvsweb/src/usr.sbin/ppp/ppp/command.c.diff?r1=1.91&r2=1.92.
- OpenBSD FTP Web page, 009_ppp.patch at ftp://ftp.openbsd.org/pub/OpenBSD/patches/4.2/common/009_ppp.patch.
- OpenBSD Web site, OpenBSD at http://www.openbsd.org/.
- BID-28090: BSD PPP 'pppx.conf' Local Denial of Service Vulnerability
- CVE-2008-1215: Stack-based buffer overflow in the command_Expand_Interpret function in command.c in ppp (aka user-ppp), as distributed in FreeBSD 6.3 and 7.0, OpenBSD 4.1 and 4.2, and the net/userppp package for NetBSD, allows local users to gain privileges via long commands containing ~ characters.
- SA29234: OpenBSD ppp Buffer Overflow Vulnerability
- SA29238: FreeBSD ppp Buffer Overflow Vulnerability
- SA29240: user-ppp "command_Expand_Interpret()" Buffer Overflow Vulnerability
Reported:
Feb 29, 2008
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