ARM mbed TLS up to 2.1.10/2.7.1 ssl_parse_server_key_exchange memory corruption

Summaryinfo

A vulnerability identified as critical has been detected in ARM mbed TLS up to 2.1.10/2.7.1. Affected by this issue is the function ssl_parse_server_key_exchange. The manipulation leads to memory corruption. This vulnerability is referenced as CVE-2018-9988. Remote exploitation of the attack is possible. No exploit is available. You should upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, has been found in ARM mbed TLS up to 2.1.10/2.7.1. This issue affects the function ssl_parse_server_key_exchange. The manipulation with an unknown input leads to a memory corruption vulnerability. Using CWE to declare the problem leads to CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

ARM mbed TLS before 2.1.11, before 2.7.2, and before 2.8.0 has a buffer over-read in ssl_parse_server_key_exchange() that could cause a crash on invalid input.

The bug was discovered 03/22/2018. The weakness was published 04/10/2018 (GitHub Repository). The advisory is shared at github.com. The identification of this vulnerability is CVE-2018-9988 since 04/10/2018. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available.

The vulnerability was handled as a non-public zero-day exploit for at least 19 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 109237 (openSUSE Security Update : mbedtls (openSUSE-2018-382)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family SuSE Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 171095 (OpenSUSE Security Update for mbedtls (openSUSE-SU-2018:1039-1)).

Upgrading to version 2.1.11, 2.7.2 or 2.8.0 eliminates this vulnerability. A possible mitigation has been published 2 weeks after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (109237). Similar entry is available at VDB-115986. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Name

• ARM mbed TLS

Version

• 2.1.0
• 2.1.1
• 2.1.2
• 2.1.3
• 2.1.4
• 2.1.5
• 2.1.6
• 2.1.7
• 2.1.8
• 2.1.9
• 2.1.10
• 2.7.0
• 2.7.1

License

• commercial

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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