#VU27970 Double Free in FreeRDP - CVE-2020-11044

Vulnerability identifier: #VU27970

Vulnerability risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-11044

CWE-ID: CWE-415

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
FreeRDP
Universal components / Libraries / Libraries used by multiple products

Vendor: FreeRDP

Description

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

The vulnerability exists due to a boundary error in "update_read_cache_bitmap_v3_order". A remote attacker can pass specially crafted data to the application, trigger double free error and cause a denal of service condition on the target system.

Note: This vulnerability affects versions greater than 1.2

Mitigation
Install updates from vendor's website.

Vulnerable software versions

FreeRDP: before 2.0.0

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External links
https://github.com/FreeRDP/FreeRDP/commit/67c2aa52b2ae0341d469071d1bc8aab91f8d2ed8
https://github.com/FreeRDP/FreeRDP/issues/6013
https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-cgqh-p732-6x2w

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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.