Out-of-bounds write in curl.haxx.se cURL

1) Out-of-bounds write

EUVDB-ID: #VU33012

Risk: Low

CVSSv4.0: 4.4 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2016-8617

CWE-ID: CWE-787 - Out-of-bounds write

Exploit availability: No

Description

The vulnerability allows a local authenticated user to execute arbitrary code.

The base64 encode function in curl before version 7.51.0 is prone to a buffer being under allocated in 32bit systems if it receives at least 1Gb as input via `CURLOPT_USERNAME`.

Mitigation

Install update from vendor's website.

Vulnerable software versions

cURL: 7.1 - 7.50.3

CPE2.3

• cpe:2.3:a:curl_haxx_se:curl:7.1:*:*:*:*:*:*:*
• cpe:2.3:a:curl_haxx_se:curl:7.1.1:*:*:*:*:*:*:*
• cpe:2.3:a:curl_haxx_se:curl:7.2:*:*:*:*:*:*:*

External links

https://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html
https://www.securityfocus.com/bid/94097
https://www.securitytracker.com/id/1037192
https://access.redhat.com/errata/RHSA-2018:2486
https://access.redhat.com/errata/RHSA-2018:3558
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2016-8617
https://curl.haxx.se/CVE-2016-8617.patch
https://curl.haxx.se/docs/adv_20161102C.html
https://security.gentoo.org/glsa/201701-47
https://www.tenable.com/security/tns-2016-21

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

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