Out-of-bounds write in FreeRDP - CVE-2018-8788

Vulnerability details

The vulnerability allows a remote authenticated attacker to cause DoS condition or execute arbitrary code.

The vulnerability exists due to out-of-bounds write condition in the nsc_rle_decode() function, as defined in the nsc.c source code file. A remote attacker can send a specially crafted request that submits malicious input, trigger a heap-based buffer overflow condition that the attacker can use to cause a DoS condition or execute arbitrary code with elevated privileges.

Successful exploitation of the vulnerability may result in system compromise.

Affected software

How to mitigate CVE-2018-8788

Links to Public Exploits and PoC-codes

• Exploit #2699 - CPR-Zero: CVE-2018-8788 (May 18, 2020)

External References

• https://github.com/FreeRDP/FreeRDP/commit/d1112c279bd1a327e8e4d0b5f371458bf2579659

Related Security Bulletins

• Multiple vulnerabilities in FreeRDP
• OpenSUSE Linux update for freerdp
• OpenSUSE Linux update for freerdp
• Ubuntu update for FreeRDP
• Red Hat update for freerdp
• Out-of-bounds write in freerdp (Alpine package)