Out-of-bounds Read Affecting openssl package, versions <1.1.0b-2
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-DEBIAN9-OPENSSL-374512
- published7 Dec 2017
- disclosed7 Dec 2017
Introduced: 7 Dec 2017
CVE-2017-3737 (opens in a new tab)How to fix?
Upgrade Debian:9 openssl to version 1.1.0b-2 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream openssl package and not the openssl package as distributed by Debian.
See How to fix? for Debian:9 relevant fixed versions and status.
OpenSSL 1.0.2 (starting from version 1.0.2b) introduced an "error state" mechanism. The intent was that if a fatal error occurred during a handshake then OpenSSL would move into the error state and would immediately fail if you attempted to continue the handshake. This works as designed for the explicit handshake functions (SSL_do_handshake(), SSL_accept() and SSL_connect()), however due to a bug it does not work correctly if SSL_read() or SSL_write() is called directly. In that scenario, if the handshake fails then a fatal error will be returned in the initial function call. If SSL_read()/SSL_write() is subsequently called by the application for the same SSL object then it will succeed and the data is passed without being decrypted/encrypted directly from the SSL/TLS record layer. In order to exploit this issue an application bug would have to be present that resulted in a call to SSL_read()/SSL_write() being issued after having already received a fatal error. OpenSSL version 1.0.2b-1.0.2m are affected. Fixed in OpenSSL 1.0.2n. OpenSSL 1.1.0 is not affected.
References
- https://security-tracker.debian.org/tracker/CVE-2017-3737
- https://cert-portal.siemens.com/productcert/pdf/ssa-179516.pdf
- https://www.tenable.com/security/tns-2017-16
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-3737
- https://www.debian.org/security/2017/dsa-4065
- https://security.FreeBSD.org/advisories/FreeBSD-SA-17:12.openssl.asc
- https://security.gentoo.org/glsa/201712-03
- https://github.com/openssl/openssl/commit/898fb884b706aaeb283de4812340bb0bde8476dc
- https://www.digitalmunition.me/2017/12/cve-2017-3737-openssl-security-bypass-vulnerability/
- https://security.netapp.com/advisory/ntap-20171208-0001/
- https://security.netapp.com/advisory/ntap-20180117-0002/
- https://security.netapp.com/advisory/ntap-20180419-0002/
- https://www.openssl.org/news/secadv/20171207.txt
- https://www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.html
- http://www.oracle.com/technetwork/security-advisory/cpuapr2018-3678067.html
- http://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.html
- http://www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html
- https://access.redhat.com/errata/RHSA-2018:0998
- https://access.redhat.com/errata/RHSA-2018:2185
- https://access.redhat.com/errata/RHSA-2018:2186
- https://access.redhat.com/errata/RHSA-2018:2187
- http://www.securityfocus.com/bid/102103
- http://www.securitytracker.com/id/1039978
- http://people.ubuntu.com/~ubuntu-security/cve/CVE-2017-3737