#VU32413 Buffer overflow in HAProxy - CVE-2015-3281

Vulnerability identifier: #VU32413

Vulnerability risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2015-3281

CWE-ID: CWE-119

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
HAProxy
Server applications / IDS/IPS systems, Firewalls and proxy servers

Vendor: HAProxy

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

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

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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.