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Openswan: buffer overflow of client via XAUTH Cisco
Synthesis of the vulnerability
An attacker can invite the victim to connect to a malicious gateway with XAUTH Cisco, in order to execute code on his computer.
Vulnerable software: Fedora, Openswan, RHEL.
Severity of this announce: 3/4.
Consequences of an intrusion: user access/rights.
Attacker's origin: intranet client.
Number of vulnerabilities in this bulletin: 2.
Creation date: 28/09/2010.
Références of this computer vulnerability: BID-43588, CVE-2010-3302, CVE-2010-3308, CVE-2010-3752, CVE-2010-3753, FEDORA-2010-15381, FEDORA-2010-15508, FEDORA-2010-15516, RHSA-2010:0892-01, VIGILANCE-VUL-9979.
Description of the vulnerability
The Openswan client can be configured to connect to a Cisco compatible gateway with XAUTH. The configuration thus contains "*xauthclient=yes" and "remote_peer_type=cisco". In this configuration, the Openswan client is impacted by two vulnerabilities.
The gateway can send long cisco_dns_info and cisco_domain_info fields, in order to generate a buffer overflow in the Openswan client. [severity:3/4; CVE-2010-3302, CVE-2010-3752]
The gateway can send a long cisco_banner field, in order to generate a buffer overflow in the Openswan client. [severity:3/4; CVE-2010-3308, CVE-2010-3753]
An attacker can therefore invite the victim to connect to a malicious gateway with XAUTH Cisco, in order to execute code on his computer.
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