Security bypass in cURL - CVE-2017-2629
Published: February 22, 2017 / Updated: February 22, 2017
Vulnerability identifier: #VU5890
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2017-2629
CWE-ID: CWE-295
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to bypass certain security restrictions.
The vulnerability exists due to an error within TLS Certificate Status Request extension implementation (a.k.a OCSP stapling) in cURL. The problem is caused by coding error, when the affected function returns positive result even when there is none or if the server doesn't support the TLS extension in question. A remote attacker can bypass CURLOPT_SSL_VERIFYSTATUS option and make the affected system treat all requests as valid.
Successful exploitation of the vulnerability may allow an attacker to bypass implemented security controls and perform a MitM or phishing attack.
Affected software
cURL
Gentoo Linux
Arch Linux
curl (Alpine package)
Gentoo Linux
Arch Linux
curl (Alpine package)
How to mitigate CVE-2017-2629
Update to version 7.53.0
curl (Alpine package) - addressed in versions 7.52.1-r1, 7.52.1-r2