CVE-2018-14779 Memory corruption in n/a
A buffer overflow in the Yubico PIV smartcard driver allows attackers to execute arbitrary code or cause denial of service via malicious smartcard data.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2018-14779?
CVE-2018-14779 is a medium-severity memory corruption vulnerability in n/a, published on 15 Aug 2018. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Which versions are affected by CVE-2018-14779?
It affects 3 products.
Products include Yubico Piv Manager, Yubico Piv Tool, Yubico Smart Card Minidriver.
How do I fix CVE-2018-14779?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2018-14779 being exploited?
There is no known exploitation of CVE-2018-14779 in the wild and no public exploit code.
Other vulnerabilities in n/a
Sources
Also known as DEBIAN-CVE-2018-14779, GHSA-rvwc-p7mj-cmgq, UBUNTU-CVE-2018-14779.