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vulnerability alert CVE-2012-1182

Samba: buffer overflow via PIDL

Synthesis of the vulnerability

An unauthenticated attacker can send a malicious RPC query, in order to generate an overflow in Samba, which leads to code execution with root privileges.
Impacted products: Debian, Fedora, HP-UX, MES, Mandriva Linux, NLD, openSUSE, Solaris, RHEL, Samba, SUSE Linux Enterprise Desktop, SLES.
Severity: 3/4.
Creation date: 11/04/2012.
Identifiers: 8815, BID-52973, BID-55655, c03365218, CERTA-2012-AVI-210, CVE-2012-1182, DSA-2450-1, FEDORA-2012-5805, FEDORA-2012-5843, FEDORA-2012-6382, HPSBUX02789, MDVSA-2012:055, openSUSE-SU-2012:0507-1, openSUSE-SU-2012:0508-1, RHSA-2012:0466-01, RHSA-2012:0478-01, RHSA-2013:0506-02, RHSA-2013:0515-02, SSRT100824, SUSE-SU-2012:0500-1, SUSE-SU-2012:0501-1, SUSE-SU-2012:0501-2, SUSE-SU-2012:0502-1, SUSE-SU-2012:0504-1, SUSE-SU-2012:0515-1, VIGILANCE-VUL-11531, ZDI-12-063, ZDI-12-064, ZDI-12-068, ZDI-12-069, ZDI-12-070, ZDI-12-071, ZDI-12-072.

Description of the vulnerability

The Samba service implements the SMB/CIFS protocol, and the associated RPC (Remote Procedure Call) features.

The source code of Samba uses PIDL (Perl Interface Definition Language), in order to generate C code implementing RPC interfaces.

The code generated by PIDL uses two variables to store the size of arrays. However, the size indicated by one variable is not checked. So, if this size is too large, a buffer overflow occurs.

An unauthenticated attacker can therefore send a malicious RPC query, in order to generate an overflow in Samba, which leads to code execution with root privileges.
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