Input validation error in cURL - CVE-2016-3739
Published: May 20, 2016 / Updated: August 3, 2020
Vulnerability identifier: #VU33070
CSH Severity: Medium
CVSS v4: 5.6 [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]
CVE-ID: CVE-2016-3739
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
cURL
curl (Alpine package)
Slackware Linux
curl (Alpine package)
Slackware Linux
How to mitigate CVE-2016-3739
Install update from vendor's website.
cURL - update to 7.49.0
curl (Alpine package) - update to 7.49.1-r0
curl (Alpine package) - update to 7.49.1-r0
External References
- http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html
- http://www.securityfocus.com/bid/90726
- http://www.securitytracker.com/id/1035907
- http://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