#VU30619 Memory leak in rsyslog - CVE-2011-1488

Vulnerability identifier: #VU30619

Vulnerability risk: Medium

CVSSv4.0: 4.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2011-1488

CWE-ID: CWE-401

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
rsyslog
Server applications / Other server solutions

Vendor: rsyslog.com

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to memory leak within rsyslog before 5.7.6 was found in the way deamon processed log messages are logged when $RepeatedMsgReduction was enabled. A local attacker could use this flaw to cause a denial of the rsyslogd daemon service by crashing the service via a sequence of repeated log messages sent within short periods of time. A remote attacker can perform a denial of service attack.

Mitigation
Update to version 5.7.6.

Vulnerable software versions

rsyslog: 5.7.0 - 5.7.5

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External links
https://lists.opensuse.org/opensuse-security-announce/2011-04/msg00005.html
https://access.redhat.com/security/cve/cve-2011-1488
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2011-1488
https://github.com/rsyslog/rsyslog/commit/1ef709cc97d54f74d3fdeb83788cc4b01f4c6a2a
https://security-tracker.debian.org/tracker/CVE-2011-1488

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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.