#VU45037 Permissions, Privileges, and Access Controls in Keepalived - CVE-2011-1784

Vulnerability identifier: #VU45037

Vulnerability risk: Medium

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2011-1784

CWE-ID: CWE-264

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Keepalived
Server applications / Other server solutions

Vendor: Keepalived

Description

The vulnerability allows a remote non-authenticated attacker to manipulate or delete data.

The pidfile_write function in core/pidfile.c in keepalived 1.2.2 and earlier uses 0666 permissions for the (1) keepalived.pid, (2) checkers.pid, and (3) vrrp.pid files in /var/run/, which allows local users to kill arbitrary processes by writing a PID to one of these files.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Keepalived: 0.2.1 - 1.2.1

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External links
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=626281
https://lists.debian.org/debian-security/2011/05/msg00012.html
https://lists.debian.org/debian-security/2011/05/msg00013.html
https://lists.debian.org/debian-security/2011/05/msg00018.html
https://openwall.com/lists/oss-security/2011/05/10/5
https://openwall.com/lists/oss-security/2011/05/16/7
https://secunia.com/advisories/44460
https://www.osvdb.org/72380
https://www.securityfocus.com/bid/47859
https://bugzilla.redhat.com/show_bug.cgi?id=704039
https://exchange.xforce.ibmcloud.com/vulnerabilities/67477

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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.