CVE-2015-5309

Description

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.

Category

4.3
CVSS
Severity: Medium
CVSS 2.0 •
EPSS 2.07% Top 20%
Vendor Advisory debian.org Vendor Advisory fedoraproject.org Vendor Advisory fedoraproject.org Vendor Advisory gentoo.org Vendor Advisory opensuse.org Vendor Advisory org.uk
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
http://www.debian.org/security/2015/dsa-3409 vendor advisory
http://lists.fedoraproject.org/pipermail/package-announce/2015-December/173021.html vendor advisory
http://lists.fedoraproject.org/pipermail/package-announce/2015-December/173094.html vendor advisory
http://www.securitytracker.com/id/1034308 vdb entry
http://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-ech-overflow.html vendor advisory
https://security.gentoo.org/glsa/201606-01 vendor advisory
http://lists.opensuse.org/opensuse-updates/2015-11/msg00099.html vendor advisory

Frequently Asked Questions

What is the severity of CVE-2015-5309?
CVE-2015-5309 has been scored as a medium severity vulnerability.
How to fix CVE-2015-5309?
To fix CVE-2015-5309, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2015-5309 being actively exploited in the wild?
It is possible that CVE-2015-5309 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~2% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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