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SunOS 2.6 7 8 :Remote Buffer Overflow Vulnerability in Solaris Print Protocol Daemon]
Internet Security Systems Security Advisory
June 19, 2001
Remote Buffer Overflow Vulnerability in Solaris Print Protocol Daemon
ISS X-Force has discovered a buffer overflow in the Solaris line printer
daemon (in.lpd) that may allow a remote or local attacker to crash the
daemon or execute arbitrary code with super user privilege. This daemon
runs with root privileges by default on all current Solaris versions.
Solaris installs the in.lpd line printer software by default. This
vulnerability may allow a remote attacker to execute arbitrary commands
without restriction. No local access to the target system is required
to exploit this vulnerability.
Solaris 2.6 x86
Solaris 7 x86
Solaris 8 x86
The Solaris BSD print protocol daemon provides an interface for remote
users to interact with a local printer. The in.lpd daemon listens on
the network for remote requests on port 515. By listening for remote
requests, there is an opportunity for a malicious user to exploit this
vulnerability remotely. The in.lpd daemon provides extensive
functionality to network users who intend to print documents over a
network. There is a flaw in the ^Stransfer job^T routine, which may
allow attackers to overflow an unchecked buffer. Attackers may exploit
this vulnerability to crash the printer daemon, or execute arbitrary
code as super user on a target system.
All current versions of Solaris install and enable the in.lpd daemon
Sun Microsystems has informed ISS X-Force that patches are in
development and will be made available in July.
Sun Microsystems has provided ISS X-Force with following patch
information. ISS X-Force recommends installing a patch for this
vulnerability when they are made available.
106235-09 SunOS 5.6: lp patch
106236-09 SunOS 5.6_x86: lp patch
107115-08 SunOS 5.7: LP patch
107116-08 SunOS 5.7_x86: LP patch
109320-04 SunOS 5.8: LP patch
109321-04 SunOS 5.8_x86: LP patch
Until these patches are released, ISS X-Force recommends that the in.lpd
daemon be disabled on all vulnerable systems. To disable the in.lpd daemon:
1. Change user to root.
2. Open /etc/inetd.conf in any text editor.
3. Search for the line beginning with ^Sprinter^T.
4. Insert a coment, or ^S#^T character at the beginning of this line.
5. Restart inetd.
ISS X-Force recommends that all unused daemons or services be disabled
to prevent exposure to both known and unknown vulnerabilities.
ISS X-Force will provide detection and assessment support for this
vulnerability in future X-Press Updates for ISS RealSecure and ISS
The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CAN-2001-0353 to this issue. This is a candidate for inclusion in
the CVE list (<http://cve.mitre.org>), which standardizes names for
About Internet Security Systems (ISS)
Internet Security Systems is the leading global provider of security
management solutions for the Internet, protecting digital assets and
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