Input validation error in PuTTY - CVE-2015-5309
Published: December 7, 2015 / Updated: August 4, 2020
Vulnerability identifier: #VU33817
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2015-5309
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 service disruption.
Integer overflow in the terminal emulator in PuTTY before 0.66 allows remote attackers to cause a denial of service (memory corruption) or possibly execute arbitrary code via an ECH (erase characters) escape sequence with a large parameter value, which triggers a buffer underflow.
How to mitigate CVE-2015-5309
Install update from vendor's website.
Sources
- http://lists.fedoraproject.org/pipermail/package-announce/2015-December/173021.html
- http://lists.fedoraproject.org/pipermail/package-announce/2015-December/173094.html
- http://lists.opensuse.org/opensuse-updates/2015-11/msg00099.html
- http://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-ech-overflow.html
- http://www.debian.org/security/2015/dsa-3409
- http://www.securitytracker.com/id/1034308
- https://security.gentoo.org/glsa/201606-01