Permissions, Privileges, and Access Controls in Keepalived

1) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU45037

Risk: Medium

CVSSv3.1: 4.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2011-1784

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

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

CPE2.3

• cpe:2.3:a:keepalived:keepalived:0.2.1:*:*:*:*:*:*:*
• cpe:2.3:a:keepalived:keepalived:0.2.3:*:*:*:*:*:*:*
• cpe:2.3:a:keepalived:keepalived:0.2.6:*:*:*:*:*:*:*

External links

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

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.