rdesktop: Multiple vulnerabilities

Security Team Contact Address

Updated June 14, 2008

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200806-04 / rdesktop
Release Date	June 14, 2008
Latest Revision	June 14, 2008: 01
Impact	normal
Exploitable	remote

Package	Vulnerable versions	Unaffected versions	Architecture(s)
net-misc/rdesktop	< 1.6.0	>= 1.6.0	All supported architectures

Related bugreports: #220911

Synopsis

Multiple vulnerabilities in rdesktop may lead to the execution of arbitrary code or a Denial of Service.

2. Impact Information

Background

rdesktop is an open source Remote Desktop Protocol (RDP) client.

Description

An anonymous researcher reported multiple vulnerabilities in rdesktop via iDefense Labs:

An integer underflow error exists in the function iso_recv_msg() in the file iso.c which can be triggered via a specially crafted RDP request, causing a heap-based buffer overflow (CVE-2008-1801).
An input validation error exists in the function process_redirect_pdu() in the file rdp.c which can be triggered via a specially crafted RDP redirect request, causing a BSS-based buffer overflow (CVE-2008-1802).
An integer signedness error exists in the function xrealloc() in the file rdesktop.c which can be be exploited to cause a heap-based buffer overflow (CVE-2008-1803).

Impact

An attacker could exploit these vulnerabilities by enticing a user to connect to a malicious RDP server thereby allowing the attacker to execute arbitrary code or cause a Denial of Service.

3. Resolution Information

Workaround

There is no known workaround at this time.

Resolution

All rdesktop users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=net-misc/rdesktop-1.6.0"

4. References