ASA-2019-00058 – rdesktop: Several integer signedness errors that leads to out-of-bounds reads in file mcs.c

Posted on by Allele Security Intelligence in Alerts

Allele Security Alert

ASA-2019-00058

Identifier(s)

ASA-2019-00058, CVE-2018-20175

Title

Several integer signedness errors that leads to out-of-bounds reads in file mcs.c

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 contains several integer signedness errors that leads to out-of-bounds reads in file mcs.c and result in a denial of service (segfault).

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-2018-20175
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-20175

CVE-2018-20175
https://nvd.nist.gov/vuln/detail/CVE-2018-20175

If there is any error in this alert or you wish a comprehensive analysis, let us know.

Last modified: February 11, 2019

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