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TITLE:
Xlpd LPD Requests Buffer Overflow Vulnerabilities

SECUNIA ADVISORY ID:
SA36989

VERIFY ADVISORY:
http://secunia.com/advisories/36989/

DESCRIPTION:
Some vulnerabilities have been discovered in Xlpd, which can be
exploited by malicious people to compromise a vulnerable system.

1) A boundary error in the processing of LPD requests can be
exploited to cause a stack-based buffer overflow via an overly large
packet sent to the LPD port (TCP port 515 by default).

2) An integer underflow error in the processing of LPD requests can
be exploited to cause a stack-based buffer overflow via a specially
crafted packet sent to the LPD port (TCP port 515 by default).

Successful exploitation of the vulnerabilities allows execution of
arbitrary code.

The vulnerabilities are confirmed in version 3.0 build 0076. Other
versions may also be affected.

SOLUTION:
Restrict network access to the LPD port.

PROVIDED AND/OR DISCOVERED BY:
1) Francis Provencher, Protek Research Lab's

CHANGELOG:
2009-10-08: Updated advisory with additional information provided by
Secunia Research.

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