Buffer overflow in HAProxy

1) Buffer overflow

EUVDB-ID: #VU32413

Risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2015-3281

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to gain access to sensitive information.

The buffer_slow_realign function in HAProxy 1.5.x before 1.5.14 and 1.6-dev does not properly realign a buffer that is used for pending outgoing data, which allows remote attackers to obtain sensitive information (uninitialized memory contents of previous requests) via a crafted request.

Mitigation

Install update from vendor's website.

Vulnerable software versions

HAProxy: 1.5.0 - 1.5.13

External links

http://git.haproxy.org/?p=haproxy-1.5.git;a=commit;h=7ec765568883b2d4e5a2796adbeb492a22ec9bd4
http://lists.opensuse.org/opensuse-security-announce/2015-10/msg00001.html
http://lists.opensuse.org/opensuse-security-announce/2015-10/msg00023.html
http://rhn.redhat.com/errata/RHSA-2015-1741.html
http://rhn.redhat.com/errata/RHSA-2015-2666.html
http://www.debian.org/security/2015/dsa-3301
http://www.haproxy.org/news.html
http://www.securityfocus.com/bid/75554
http://www.ubuntu.com/usn/USN-2668-1

Q & A

Can this vulnerability be exploited remotely?

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

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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