Input validation error in PuTTY - CVE-2019-9897
Published: March 21, 2019 / Updated: July 17, 2020
Vulnerability identifier: #VU31144
CSH Severity: Medium
CVSS v4.0: 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-2019-9897
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Simon Tatham
Affected software:
PuTTY
PuTTY
Detailed vulnerability description
The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.
Multiple denial-of-service attacks that can be triggered by writing to the terminal exist in PuTTY versions before 0.71.
How to mitigate CVE-2019-9897
Install update from vendor's website.
Sources
- http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00004.html
- http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00020.html
- https://lists.debian.org/debian-lts-announce/2019/04/msg00023.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/36LWQ3NPFIV7DC7TC4KFPRYRH2OR7SZ2/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/LDO3F267P347E6U2IILFCYW7JPTLCCES/
- https://seclists.org/bugtraq/2019/Apr/6
- https://security.netapp.com/advisory/ntap-20190404-0001/
- https://www.chiark.greenend.org.uk/~sgtatham/putty/changes.html
- https://www.debian.org/security/2019/dsa-4423