#VU33013 Use-after-free in cURL - CVE-2016-8623

Vulnerability identifier: #VU33013

Vulnerability risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2016-8623

CWE-ID: CWE-416

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
cURL
Client/Desktop applications / Other client software

Vendor: curl.haxx.se

Description

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

A flaw was found in curl before version 7.51.0. The way curl handles cookies permits other threads to trigger a use-after-free leading to information disclosure.

Mitigation
Install update from vendor's website.

Vulnerable software versions

cURL: 7.1 - 7.50.3

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External links
https://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html
https://www.securityfocus.com/bid/94106
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-2016-8623
https://curl.haxx.se/CVE-2016-8623.patch
https://curl.haxx.se/docs/adv_20161102I.html
https://security.gentoo.org/glsa/201701-47
https://www.tenable.com/security/tns-2016-21

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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.