Input validation error in Samba Rsync

1) Input validation error

EUVDB-ID: #VU41760

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2014-2855

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

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

The check_secret function in authenticate.c in rsync 3.1.0 and earlier allows remote attackers to cause a denial of service (infinite loop and CPU consumption) via a user name which does not exist in the secrets file.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Rsync: 2.6.9 - 3.0.9

External links

http://advisories.mageia.org/MGASA-2015-0065.html
http://lists.fedoraproject.org/pipermail/package-announce/2014-April/131910.html
http://lists.opensuse.org/opensuse-updates/2014-05/msg00006.html
http://secunia.com/advisories/57948
http://www.mandriva.com/security/advisories?name=MDVSA-2015:131
http://www.openwall.com/lists/oss-security/2014/04/14/5
http://www.openwall.com/lists/oss-security/2014/04/15/1
http://www.ubuntu.com/usn/USN-2171-1
http://bugs.launchpad.net/ubuntu/+source/rsync/+bug/1307230
http://bugzilla.samba.org/show_bug.cgi?id=10551
http://git.samba.org/?p=rsync.git;a=commit;h=0dedfbce2c1b851684ba658861fe9d620636c56a

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.