ASA-2019-00050 – rdesktop: Integer overflow that leads to an out-of-bounds write in function process_bitmap_updates()

Posted on by Allele Security Intelligence in Alerts

Allele Security Alert

ASA-2019-00050

Identifier(s)

ASA-2019-00050, CVE-2018-8794

Title

Integer overflow that leads to an out-of-bounds write in function process_bitmap_updates()

Vendor(s)

rdesktop team

Product(s)

rdesktop

Affected version(s)

rdesktop versions up to and including v1.8.3

Fixed version(s)

rdesktop v1.8.4

Proof of concept

Unknown

Description

rdesktop versions up to and including v1.8.3 contain an integer overflow that leads to an out-of-bounds write in function process_bitmap_updates() and results in a memory corruption and possibly even a remote code execution.

Technical details

Unknown

Credits

Eyal Itkin (Checkpoint Research)

Reference(s)

Reverse RDP Attack: Code Execution on RDP Clients
https://research.checkpoint.com/reverse-rdp-attack-code-execution-on-rdp-clients/

Updated ChangeLog and bumped version to 1.8.4
https://github.com/rdesktop/rdesktop/commit/34b8a18fe5d4de795851defe34b3ad3e1f43532b

CVE-2018-8794
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-8794

CVE-2018-8794
https://nvd.nist.gov/vuln/detail/CVE-2018-8794

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Last modified: February 11, 2019

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