SB2019052901 - Ubuntu update for FreeRDP
Published: May 29, 2019
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 6 secuirty vulnerabilities.
1) Heap-based buffer overflow (CVE-ID: CVE-2018-8784)
The vulnerability allows a remote authenticated attacker to cause DoS condition or execute arbitrary code.
The vulnerability exists due to improper handling of certain stream encodings by the zgfx_decompress_segment() function, as defined in the zgfx.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.
2) Heap-based buffer overflow (CVE-ID: CVE-2018-8785)
The vulnerability allows a remote authenticated attacker to cause DoS condition or execute arbitrary code.
The vulnerability exists due to improper handling of certain stream encodings by the zgfx_decompress() function. 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.
3) Heap-based buffer overflow (CVE-ID: CVE-2018-8786)
The vulnerability allows a remote authenticated attacker to cause DoS condition or execute arbitrary code.
The vulnerability exists due to improper handling of bitmaps by the update_read_bitmap_update() function, as defined in the update.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.
4) Integer overflow (CVE-ID: CVE-2018-8787)
The vulnerability allows a remote authenticated attacker to cause DoS condition or execute arbitrary code.
The vulnerability exists due to integer overflow condition that exists in the gdi_Bitmap_Decompress() function, as defined in the graphics.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.
5) Out-of-bounds write (CVE-ID: CVE-2018-8788)
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.
6) Out-of-bounds read (CVE-ID: CVE-2018-8789)
The vulnerability allows a remote attacker to cause DoS condition.
The vulnerability exists due to several out-of-bound read conditions that exist in the NTLM authentication module. A remote attacker can send a specially crafted request that submits malicious input, trigger several out-of-bounds read conditions that the attacker can use to cause a DoS condition.
Remediation
Install update from vendor's website.