Vulnerability Monitor

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CVE-2018-14779

A buffer overflow 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_transfer_data()`: {% highlight c %} if(*out_len + recv_len - 2 > max_out) { fprintf(stderr, "Output buffer to small, wanted to write %lu, max was %lu.", *out_len + recv_len - 2, max_out); } if(out_data) { memcpy(out_data, data, recv_len - 2); out_data += recv_len - 2; *out_len += recv_len - 2; } {% endhighlight %} -- it is clearly checked whether the buffer is big enough to hold the data copied using `memcpy()`, but no error handling happens to avoid the `memcpy()` in such cases. This code path can be triggered with malicious data coming from a smartcard.

Published

2018-08-15T18:29:00.747

Last Modified

2024-11-21T03:49:46.380

Status

Modified

Source

[email protected]

Severity

CVSSv3.0: 6.8 (MEDIUM)

CVSSv2 Vector

AV:L/AC:L/Au:N/C:C/I:C/A:C

  • Access Vector: LOCAL
  • Access Complexity: LOW
  • Authentication: NONE
  • Confidentiality Impact: COMPLETE
  • Integrity Impact: COMPLETE
  • Availability Impact: COMPLETE
Exploitability Score

3.9

Impact Score

10.0

Weaknesses
  • Type: Primary
    CWE-119
    CWE-787
Affected Vendors & Products
Type Vendor Product Version/Range Vulnerable?
Application yubico piv_manager < 1.4.2 Yes
Application yubico piv_manager 1.4.2 Yes
Application yubico piv_manager 1.4.2b Yes
Application yubico piv_manager 1.4.2c Yes
Application yubico piv_manager 1.4.2d Yes
Application yubico piv_manager 1.4.2e Yes
Application yubico piv_manager 1.4.2f Yes
Application yubico piv_manager 1.4.2g Yes
Application yubico piv_tool < 1.6.0 Yes
Application yubico smart_card_minidriver ≤ 3.7.3.160 Yes
References