Input validation error in PuTTY - CVE-2015-5309

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Main Vulnerability Database Vulnerabilities #VU33817

Input validation error in PuTTY - CVE-2015-5309

Published: December 7, 2015 / Updated: August 4, 2020


Vulnerability identifier: #VU33817
CSH Severity: Medium
CVSS v4: 6.9 [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]
CVE-ID: CVE-2015-5309
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

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.


Affected software

PuTTY
Gentoo Linux
Fedora
putty (Alpine package)
putty

How to mitigate CVE-2015-5309

Install update from vendor's website.

PuTTY - update to 0.66
putty (Alpine package) - update to 0.66-r0
putty - addressed in versions 0.63-5.el5, 0.63-5.el6, 0.65-2.fc21, 0.65-2.fc22, 0.65-2.fc23, 0.66-1.fc22, 0.66-1.fc23

External References

Related Security Bulletins