Multiple vulnerabilities in FreeRDP and LodePNG



Published: 2019-10-04 | Updated: 2020-05-08
Risk Medium
Patch available YES
Number of vulnerabilities 2
CVE-ID CVE-2019-17177
CVE-2019-17178
CWE-ID CWE-401
Exploitation vector Network
Public exploit N/A
Vulnerable software
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FreeRDP
Universal components / Libraries / Libraries used by multiple products

LodePNG
Universal components / Libraries / Libraries used by multiple products

Vendor FreeRDP
Lode Vandevenne

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

Updated: 08.05.2020

Changed bulletin status to patched.

1) Memory leak

EUVDB-ID: #VU23150

Risk: Medium

CVSSv3.1: 6.9 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:U/RC:C]

CVE-ID: CVE-2019-17177

CWE-ID: CWE-401 - Missing release of memory after effective lifetime

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform denial of service (DoS) attack.

The vulnerability exists due memory leak in "libfreerdp/codec/region.c" file when a supplied realloc pointer (i.e., the first argument to realloc) is also used for a realloc return value. A remote attacker can cause a denial of service condition on the target system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

FreeRDP: 1.1.0 - 2.0.0 rc4

External links

http://github.com/akallabeth/FreeRDP/commit/fc80ab45621bd966f70594c0b7393ec005a94007
http://github.com/FreeRDP/FreeRDP/issues/5645


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Memory leak

EUVDB-ID: #VU23151

Risk: Medium

CVSSv3.1: 6.9 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:U/RC:C]

CVE-ID: CVE-2019-17178

CWE-ID: CWE-401 - Missing release of memory after effective lifetime

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due memory leak in "HuffmanTree_makeFromFrequencies" in "lodepng.c" in LodePNG, as used in WinPR in FreeRDP because a supplied realloc pointer (i.e., the first argument to realloc) is also used for a realloc return value. A remote attacker can cause a denial of service condition on the target system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

FreeRDP: 1.0.0 - 1.1.0 beta1

LodePNG: 2019-09-28

External links

http://github.com/akallabeth/FreeRDP/commit/fc80ab45621bd966f70594c0b7393ec005a94007
http://github.com/FreeRDP/FreeRDP/issues/5645


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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