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[ GLSA 200504-01 ] telnet-bsd: Multiple buffer overflows
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GLSA
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Joined: 13 Jun 2003
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Location: Barcelona, Spain

PostPosted: Fri Apr 01, 2005 11:35 am    Post subject: [ GLSA 200504-01 ] telnet-bsd: Multiple buffer overflows Reply with quote

Gentoo Linux Security Advisory

Title: telnet-bsd: Multiple buffer overflows (GLSA 200504-01)
Severity: normal
Exploitable: remote
Date: April 01, 2005
Bug(s): #87019
ID: 200504-01

Synopsis

The telnet-bsd telnet client is vulnerable to two buffer overflows, which could allow a malicious telnet server operator to execute arbitrary code.

Background

telnet-bsd provides a command line telnet client which is used for remote login using the telnet protocol.

Affected Packages

Package: net-misc/telnet-bsd
Vulnerable: < 1.0-r1
Unaffected: >= 1.0-r1
Architectures: All supported architectures


Description

A buffer overflow has been identified in the env_opt_add() function of telnet-bsd, where a response requiring excessive escaping can cause a heap-based buffer overflow. Another issue has been identified in the slc_add_reply() function, where a large number of SLC commands can overflow a fixed size buffer.

Impact

Successful exploitation would require a vulnerable user to connect to an attacker-controlled host using telnet, potentially executing arbitrary code with the permissions of the telnet user.

Workaround

There is no known workaround at this time.

Resolution

All telnet-bsd users should upgrade to the latest version:
Code:
# emerge --sync
# emerge --ask --oneshot --verbose ">=net-misc/telnet-bsd-1.0-r1"


References

CAN-2005-0468
IDEF0867
CAN-2005-0469
IDEF0866


Last edited by GLSA on Sun May 07, 2006 4:55 pm; edited 1 time in total
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