libcURL up to 7.30.0 on WinCE lib/vtls/schannel.c verify_certificate certificate validation

Summaryinfo

A vulnerability was found in libcURL up to 7.30.0 on WinCE. It has been classified as critical. The impacted element is the function verify_certificate in the library lib/vtls/schannel.c. This manipulation causes certificate validation. This vulnerability is registered as CVE-2016-9952. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability has been found in libcURL up to 7.30.0 on WinCE (Network Utility Software) and classified as critical. Affected by this vulnerability is the function verify_certificate in the library lib/vtls/schannel.c. The manipulation with an unknown input leads to a certificate validation vulnerability. The CWE definition for the vulnerability is CWE-295. The product does not validate, or incorrectly validates, a certificate. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

The verify_certificate function in lib/vtls/schannel.c in libcurl 7.30.0 through 7.51.0, when built for Windows CE using the schannel TLS backend, makes it easier for remote attackers to conduct man-in-the-middle attacks via a crafted wildcard SAN in a server certificate, as demonstrated by "*.com."

The bug was discovered 12/21/2016. The weakness was published 03/12/2018 (Website). The advisory is shared at curl.haxx.se. This vulnerability is known as CVE-2016-9952 since 12/15/2016. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1587.003 for this issue.

The vulnerability was handled as a non-public zero-day exploit for at least 446 days. During that time the estimated underground price was around $0-$5k. The commercial vulnerability scanner Qualys is able to test this issue with plugin 43619 (Juniper Junos OS Multiple vulnerabilities in cURL versions (JSA10874)).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Similar entry is available at VDB-114386. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• Network Utility Software

Name

• libcURL

Version

• 7.0
• 7.1
• 7.2
• 7.3
• 7.4
• 7.5
• 7.6
• 7.7
• 7.8
• 7.9
• 7.10
• 7.11
• 7.12
• 7.13
• 7.14
• 7.15
• 7.16
• 7.17
• 7.18
• 7.19
• 7.20
• 7.21
• 7.22
• 7.23
• 7.24
• 7.25
• 7.26
• 7.27
• 7.28
• 7.29
• 7.30.0

License

• open-source

CPE 2.3info

• 🔍
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CPE 2.2info

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Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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