SB2015120702 - Input validation error in PuTTY
Published: December 7, 2015 Updated: August 4, 2020
Security Bulletin ID
SB2015120702
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Input validation error (CVE-ID: CVE-2015-5309)
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.
Remediation
Install update from vendor's website.
References
- 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