Buffer overflow in rsyslog.com rsyslog

1) Buffer overflow

EUVDB-ID: #VU32475

Risk: Medium

CVSSv3.1: 6.4 [CVSS:3.1/CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2014-3634

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to read and manipulate data.

rsyslog before 7.6.6 and 8.x before 8.4.1 and sysklogd 1.5 and earlier allows remote attackers to cause a denial of service (crash), possibly execute arbitrary code, or have other unspecified impact via a crafted priority (PRI) value that triggers an out-of-bounds array access.

Mitigation

Install update from vendor's website.

Vulnerable software versions

rsyslog: 7.6.0 - 7.6.5

External links

http://advisories.mageia.org/MGASA-2014-0411.html
http://linux.oracle.com/errata/ELSA-2014-1654
http://lists.opensuse.org/opensuse-security-announce/2014-10/msg00005.html
http://lists.opensuse.org/opensuse-updates/2014-10/msg00020.html
http://lists.opensuse.org/opensuse-updates/2014-10/msg00021.html
http://rhn.redhat.com/errata/RHSA-2014-1397.html
http://rhn.redhat.com/errata/RHSA-2014-1654.html
http://rhn.redhat.com/errata/RHSA-2014-1671.html
http://secunia.com/advisories/61494
http://secunia.com/advisories/61720
http://secunia.com/advisories/61930
http://www.debian.org/security/2014/dsa-3040
http://www.mandriva.com/security/advisories?name=MDVSA-2015:130
http://www.openwall.com/lists/oss-security/2014/09/30/15
http://www.openwall.com/lists/oss-security/2014/10/03/1
http://www.oracle.com/technetwork/topics/security/bulletinoct2015-2511968.html
http://www.rsyslog.com/remote-syslog-pri-vulnerability/
http://www.ubuntu.com/usn/USN-2381-1

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.