CVE-2019-8258 Memory corruption in UltraVNC
A heap buffer overflow in the UltraVNC client allows remote attackers to execute arbitrary code via network connectivity.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2019-8258?
CVE-2019-8258 is a critical memory corruption vulnerability in UltraVNC, published on 5 Mar 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
UltraVNC revision 1198 has a heap buffer overflow vulnerability in VNC client code which results code execution. This attack appears to be exploitable via network connectivity. This vulnerability has been fixed in revision 1199.
Which versions are affected by CVE-2019-8258?
It affects 4 products.
Products include Siemens Sinumerik Access Mymachine\/P2p, Siemens Sinumerik Pcu Base Win10 Software\/Ipc, Siemens Sinumerik Pcu Base Win7 Software\/Ipc, Uvnc Ultravnc.
How do I fix CVE-2019-8258?
No fix has been published for CVE-2019-8258 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2019-8258 being exploited?
There is no known exploitation of CVE-2019-8258 in the wild and no public exploit code.
Other vulnerabilities in UltraVNC
Sources
Also known as GHSA-gvjj-vw6c-72cq.