Buffer overflow in PuTTY - CVE-2019-9895
Published: March 21, 2019 / Updated: July 28, 2020
Vulnerability identifier: #VU32029
CSH Severity: High
CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2019-9895
CWE-ID: CWE-119
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.
In PuTTY versions before 0.71 on Unix, a remotely triggerable buffer overflow exists in any kind of server-to-client forwarding.
Affected software
PuTTY
putty (Alpine package)
putty
Fedora
putty (Alpine package)
putty
Fedora
How to mitigate CVE-2019-9895
Install update from vendor's website.
PuTTY - update to 0.71
putty (Alpine package) - update to 0.71-r0
putty - addressed in versions 0.71-1.el7, 0.71-1.fc28, 0.71-1.fc29, 0.71-1.fc30
putty (Alpine package) - update to 0.71-r0
putty - addressed in versions 0.71-1.el7, 0.71-1.fc28, 0.71-1.fc29, 0.71-1.fc30
External References
- http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00004.html
- http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00020.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