Yubico-Piv 1.5.0 lib/ykpiv.c _ykpiv_fetch_object` out-of-bounds

Summaryinfo

A vulnerability identified as critical has been detected in Yubico-Piv 1.5.0. Affected is the function _ykpiv_fetch_object` in the library lib/ykpiv.c. The manipulation leads to out-of-bounds. This vulnerability is uniquely identified as CVE-2018-14780. It is possible to launch the attack on the physical device. No exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Yubico-Piv 1.5.0. It has been rated as critical. This issue affects the function _ykpiv_fetch_object` in the library lib/ykpiv.c. The manipulation with an unknown input leads to a out-of-bounds vulnerability. Using CWE to declare the problem leads to CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

An out-of-bounds read issue was discovered in the Yubico-Piv 1.5.0 smartcard driver. The file lib/ykpiv.c contains the following code in the function `_ykpiv_fetch_object()`: {% highlight c %} if(sw == SW_SUCCESS) { size_t outlen; int offs = _ykpiv_get_length(data + 1, &outlen); if(offs == 0) { return YKPIV_SIZE_ERROR; } memmove(data, data + 1 + offs, outlen); *len = outlen; return YKPIV_OK; } else { return YKPIV_GENERIC_ERROR; } {% endhighlight %} -- in the end, a `memmove()` occurs with a length retrieved from APDU data. This length is not checked for whether it is outside of the APDU data retrieved. Therefore the `memmove()` could copy bytes behind the allocated data buffer into this buffer.

The bug was discovered 08/14/2018. The weakness was disclosed 08/15/2018 (oss-sec). The advisory is shared at openwall.com. The identification of this vulnerability is CVE-2018-14780 since 08/01/2018. The exploitation is known to be easy. An attack has to be approached locally. 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 1 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 117329 (openSUSE Security Update : yubico-piv-tool (openSUSE-2018-969)), 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 171555 (OpenSUSE Security Update for yubico-piv-tool (openSUSE-SU-2018:2623-1)).

Upgrading eliminates this vulnerability. A possible mitigation has been published 4 weeks after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (117329). The entry VDB-122956 is pretty similar. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Name

• Yubico-Piv

Version

• 1.5.0

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CPE 2.2info

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If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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