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CVE-2018-14779
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MITRE ATT&CK
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Command and Control
Credential Access
Defense Evasion
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Exfiltration
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Initial Access
Lateral Movement
Persistence
Privilege Escalation
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Description
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.
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