Input validation error in curl.haxx.se cURL

1) Input validation error

EUVDB-ID: #VU33070

Risk: Medium

CVSSv4.0: 1.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2016-3739

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to manipulate data.

The (1) mbed_connect_step1 function in lib/vtls/mbedtls.c and (2) polarssl_connect_step1 function in lib/vtls/polarssl.c in cURL and libcurl before 7.49.0, when using SSLv3 or making a TLS connection to a URL that uses a numerical IP address, allow remote attackers to spoof servers via an arbitrary valid certificate.

Mitigation

Install update from vendor's website.

Vulnerable software versions

cURL: 7.1 - 7.48.0

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/90726
https://www.securitytracker.com/id/1035907
https://www.slackware.com/security/viewer.php?l=slackware-security&y=2016&m=slackware-security.495349
https://curl.haxx.se/changes.html#7_49_0
https://curl.haxx.se/CVE-2016-3739.patch
https://curl.haxx.se/docs/adv_20160518.html
https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05320149
https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05390722
https://security.gentoo.org/glsa/201701-47

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.