Out-of-bounds read in Debian Linux - CVE-2018-20175
Published: March 15, 2019 / Updated: August 4, 2020
Vulnerability identifier: #VU33449
CSH Severity: Medium
CVSS v4: 8.7 [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]
CVE-ID: CVE-2018-20175
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.
rdesktop versions up to and including v1.8.3 contains several Integer Signedness errors that lead to Out-Of-Bounds Reads in the file mcs.c and result in a Denial of Service (segfault).
Affected software
Debian Linux
Gentoo Linux
Arch Linux
SUSE Linux
Opensuse
Fedora
busybox (Alpine package)
rdesktop (Alpine package)
firefox-esr (Alpine package)
rdesktop
Gentoo Linux
Arch Linux
SUSE Linux
Opensuse
Fedora
busybox (Alpine package)
rdesktop (Alpine package)
firefox-esr (Alpine package)
rdesktop
How to mitigate CVE-2018-20175
Install update from vendor's website.
rdesktop (Alpine package) - update to 1.8.6-r0
rdesktop - addressed in versions 1.8.4-2.fc28, 1.8.4-2.fc29
rdesktop - addressed in versions 1.8.4-2.fc28, 1.8.4-2.fc29
External References
- http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00040.html
- http://www.securityfocus.com/bid/106938
- https://github.com/rdesktop/rdesktop/commit/4dca546d04321a610c1835010b5dad85163b65e1
- https://lists.debian.org/debian-lts-announce/2019/02/msg00030.html
- https://research.checkpoint.com/reverse-rdp-attack-code-execution-on-rdp-clients/
- https://security.gentoo.org/glsa/201903-06
- https://www.debian.org/security/2019/dsa-4394
Related Security Bulletins
- Out-of-bounds read in Debian Linux
- OpenSUSE Linux update for rdesktop
- Out-of-bounds read in rdesktop (Alpine package)
- Out-of-bounds read in busybox (Alpine package)
- Arch Linux update for rdesktop
- Gentoo update for rdesktop
- Out-of-bounds read in firefox-esr (Alpine package)
- Fedora 28 update for rdesktop
- Fedora 29 update for rdesktop