Home/CVE/Schannel (aka Secure Channel) in Microsoft Windows Server 2003 SP2, Windows Vista SP2, Windows Server 2008 SP2 and R2 SP
CVE

CVE-2015-1637

Schannel (aka Secure Channel) in Microsoft Windows Server 2003 SP2, Windows Vista SP2, Windows Server 2008 SP2 and R2 SP

Schannel (aka Secure Channel) in Microsoft Windows Server 2003 SP2, Windows Vista SP2, Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8, Windows 8.1, Windows Server 2012 Gold and R2, and Windows RT Gold and 8.1 does not properly restrict TLS state transitions, which makes it easier for remote attackers to conduct cipher-downgrade attacks to EXPORT_RSA ciphers via crafted TLS traffic, related to the "FREAK" issue, a different vulnerability than CVE-2015-0204 and CVE-2015-1067.

MEDIUM · CVSS 4.3 EPSS 0.43723
Schedule remediation
  • EPSS ≥ 0.10 - elevated exploitation probability
  • EPSS percentile: top 2% of all CVEs by exploitation likelihood
Sigma rules0 YARA rules0
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Affected Products & Versions

9
microsoft windows 7all versions
microsoft windows 8all versions
microsoft windows 8.1all versions
microsoft windows rtall versions
microsoft windows rt 8.1all versions
microsoft windows server 2003all versions
microsoft windows server 2008all versions
microsoft windows server 2012all versions
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Detection Rules (IDS/IPS)

1
et-openET EXPLOIT FREAK Weak Export Suite From Server (CVE-2015-0204)bad-unknown
Open rulesets (ET Open, Snort Community, abuse.ch) link to source. Commercial rulesets are reference-only.
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Scoring & Timeline

4.3
MEDIUM · CVSS v2 (legacy) · secure@microsoft.com
View on NVD
This CVE predates CVSS v3; the legacy v2 score is shown so triage still has a severity to work with.
v2 Vector
AV:N/AC:M/Au:N/C:N/I:P/A:N
Published to NVD06 Mar 2015 · 05:59 PM
🔗

References & Sources

6
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
http://web.archive.org/web/20150321220028/https://freakattack.com/
http://www.securityfocus.com/bid/72965Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1031833Third Party AdvisoryVDB Entry
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2015/ms15-031PatchVendor Advisory
https://freakattack.com/Vendor Advisory
https://technet.microsoft.com/library/security/3046015PatchVendor Advisory
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