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RSYSLOG: integer overflow of PRI
Synthesis of the vulnerability
An attacker can generate an integer overflow via PRI in RSYSLOG, in order to trigger a denial of service, and possibly to execute code.
Vulnerable software: Debian, Fedora, AIX, openSUSE, Solaris, RHEL, RSYSLOG, SUSE Linux Enterprise Desktop, SLES, Ubuntu.
Severity of this announce: 2/4.
Consequences of an intrusion: administrator access/rights, privileged access/rights, user access/rights, denial of service on server, denial of service on service.
Attacker's origin: intranet client.
Creation date: 30/09/2014.
Références of this computer vulnerability: bulletinoct2015, CVE-2014-3634, DSA-3040-1, FEDORA-2014-12503, FEDORA-2014-12878, FEDORA-2014-12910, MDVSA-2014:196, MDVSA-2015:130, openSUSE-SU-2014:1297-1, openSUSE-SU-2014:1298-1, RHSA-2014:1397-01, RHSA-2014:1654-01, RHSA-2014:1671-01, SUSE-SU-2014:1294-1, USN-2381-1, VIGILANCE-VUL-15427.
Description of the vulnerability
The RSYSLOG product analyzes messages in the SYSLOG format:
<PRI> HEADER MSG
The PRI field indicates the priority, which is composed of the message Facility and Severity.
However, if PRI is larger than 191, an array related to the Facility overflows in RSYSLOG.
When RSYSLOG is configured to accept SYSLOG messages from the network, this vulnerability can be remotely exploited.
An attacker can therefore generate an integer overflow via PRI in RSYSLOG, in order to trigger a denial of service, and possibly to execute code.
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