Botan up to 2.4.0 Certificate certificate validation

Summaryinfo

A vulnerability, which was classified as critical, has been found in Botan up to 2.4.0. The impacted element is an unknown function of the component Certificate Handler. The manipulation leads to certificate validation. This vulnerability is traded as CVE-2018-9127. It is possible to initiate the attack remotely. There is no exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Botan up to 2.4.0 and classified as critical. This issue affects an unknown functionality of the component Certificate Handler. The manipulation with an unknown input leads to a certificate validation vulnerability. Using CWE to declare the problem leads to CWE-295. The product does not validate, or incorrectly validates, a certificate. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

Botan 2.2.0 - 2.4.0 (fixed in 2.5.0) improperly handled wildcard certificates and could accept certain certificates as valid for hostnames when, under RFC 6125 rules, they should not match. This only affects certificates issued to the same domain as the host, so to impersonate a host one must already have a wildcard certificate matching other hosts in the same domain. For example, b*.example.com would match some hostnames that do not begin with a 'b' character.

The bug was discovered 03/29/2018. The weakness was shared 04/02/2018 (Website). The advisory is shared at botan.randombit.net. The identification of this vulnerability is CVE-2018-9127 since 03/29/2018. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Neither technical details nor an exploit are publicly 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 4 days. During that time the estimated underground price was around $0-$5k.

Upgrading to version 2.5.0 eliminates this vulnerability.

The entries VDB-93182, VDB-116219 and VDB-119574 are related to this item. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Name

• Botan

Version

• 2.0
• 2.1
• 2.2
• 2.3
• 2.4.0

License

• open-source

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

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

Discussion