CVE-2016-0778
HIGHCVSS 8.1/10EPSS 20.37%
Last modified
CVE-2016-0778 is a high-severity vulnerability rated 8.1/10 on the CVSS scale. The (1) roaming_read and (2) roaming_write functions in roaming_common.c in the client in OpenSSH 5.x, 6.x, and 7.x before 7.1p2, when certain proxy and forward options are enabled, do not properly maintain connection file descriptors, which allows remote servers to cause a denial of service (heap-based buffer overflow) or possibly have unspecified other impact by requesting many forwardings.. EPSS estimates a 20.37% chance of exploitation in the next 30 days.
Description
The (1) roaming_read and (2) roaming_write functions in roaming_common.c in the client in OpenSSH 5.x, 6.x, and 7.x before 7.1p2, when certain proxy and forward options are enabled, do not properly maintain connection file descriptors, which allows remote servers to cause a denial of service (heap-based buffer overflow) or possibly have unspecified other impact by requesting many forwardings.
Metrics
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Oracle | Linux | 7 |
| Oracle | Solaris | 11.3 |
| Openbsd | Openssh | 5.4 |
| Openbsd | Openssh | 5.5 |
| Openbsd | Openssh | 5.6 |
| Openbsd | Openssh | 5.7 |
| Openbsd | Openssh | 5.8 |
| Openbsd | Openssh | 5.9 |
| Openbsd | Openssh | 6.0 |
| Openbsd | Openssh | 6.1 |
| Openbsd | Openssh | 6.2 |
| Openbsd | Openssh | 6.3 |
| Openbsd | Openssh | 6.4 |
| Openbsd | Openssh | 6.5 |
| Openbsd | Openssh | 6.6 |
| Openbsd | Openssh | 6.7 |
| Openbsd | Openssh | 6.8 |
| Openbsd | Openssh | 6.9 |
| Openbsd | Openssh | 7.0 |
| Openbsd | Openssh | 7.1 |
| Apple | Mac Os X | >= 10.9.0, <= 10.9.5 |
| Apple | Mac Os X | >= 10.10.0, <= 10.10.5 |
| Apple | Mac Os X | >= 10.11.0, <= 10.11.3 |
| Hp | Virtual Customer Access System | <= 15.07 |
| Sophos | Unified Threat Management Software | 9.353 |
References
- http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10734Third Party Advisory
- http://lists.apple.com/archives/security-announce/2016/Mar/msg00004.htmlMailing List, Release Notes, Third Party Advisory
- http://lists.fedoraproject.org/pipermail/package-announce/2016-February/176516.htmlMailing List, Third Party Advisory
- http://lists.fedoraproject.org/pipermail/package-announce/2016-January/176349.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00006.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00007.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00008.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00009.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00013.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00014.htmlMailing List, Third Party Advisory
- http://packetstormsecurity.com/files/135273/Qualys-Security-Advisory-OpenSSH-Overflow-Leak.htmlThird Party Advisory, VDB Entry
- http://seclists.org/fulldisclosure/2016/Jan/44Mailing List, Third Party Advisory
- http://www.debian.org/security/2016/dsa-3446Third Party Advisory
- http://www.openssh.com/txt/release-7.1p2Patch, Release Notes, Vendor Advisory
- http://www.openwall.com/lists/oss-security/2016/01/14/7Exploit, Mailing List, Technical Description, Third Party Advisory
- http://www.oracle.com/technetwork/topics/security/bulletinoct2015-2511968.htmlThird Party Advisory
- http://www.securityfocus.com/archive/1/537295/100/0/threadedThird Party Advisory, VDB Entry
- http://www.securityfocus.com/bid/80698Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1034671Third Party Advisory, VDB Entry
- http://www.ubuntu.com/usn/USN-2869-1Third Party Advisory
- https://blogs.sophos.com/2016/02/17/utm-up2date-9-354-released/Release Notes, Vendor Advisory
- https://blogs.sophos.com/2016/02/29/utm-up2date-9-319-released/Release Notes, Vendor Advisory
- https://bto.bluecoat.com/security-advisory/sa109Third Party Advisory
- https://security.gentoo.org/glsa/201601-01Third Party Advisory
- https://support.apple.com/HT206167Vendor Advisory
- http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10734Third Party Advisory
- http://lists.apple.com/archives/security-announce/2016/Mar/msg00004.htmlMailing List, Release Notes, Third Party Advisory
- http://lists.fedoraproject.org/pipermail/package-announce/2016-February/176516.htmlMailing List, Third Party Advisory
- http://lists.fedoraproject.org/pipermail/package-announce/2016-January/176349.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00006.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00007.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00008.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00009.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00013.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00014.htmlMailing List, Third Party Advisory
- http://packetstormsecurity.com/files/135273/Qualys-Security-Advisory-OpenSSH-Overflow-Leak.htmlThird Party Advisory, VDB Entry
- http://seclists.org/fulldisclosure/2016/Jan/44Mailing List, Third Party Advisory
- http://www.debian.org/security/2016/dsa-3446Third Party Advisory
- http://www.openssh.com/txt/release-7.1p2Patch, Release Notes, Vendor Advisory
- http://www.openwall.com/lists/oss-security/2016/01/14/7Exploit, Mailing List, Technical Description, Third Party Advisory
- http://www.oracle.com/technetwork/topics/security/bulletinoct2015-2511968.htmlThird Party Advisory
- http://www.securityfocus.com/archive/1/537295/100/0/threadedThird Party Advisory, VDB Entry
- http://www.securityfocus.com/bid/80698Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1034671Third Party Advisory, VDB Entry
- http://www.ubuntu.com/usn/USN-2869-1Third Party Advisory
- https://blogs.sophos.com/2016/02/17/utm-up2date-9-354-released/Release Notes, Vendor Advisory
- https://blogs.sophos.com/2016/02/29/utm-up2date-9-319-released/Release Notes, Vendor Advisory
- https://bto.bluecoat.com/security-advisory/sa109Third Party Advisory
- https://security.gentoo.org/glsa/201601-01Third Party Advisory
- https://support.apple.com/HT206167Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2016-0778?
The (1) roaming_read and (2) roaming_write functions in roaming_common.c in the client in OpenSSH 5.x, 6.x, and 7.x before 7.1p2, when certain proxy and forward options are enabled, do not properly maintain connection file descriptors, which allows remote servers to cause a denial of service (heap-based buffer overflow) or possibly have unspecified other impact by requesting many forwardings.
How severe is CVE-2016-0778?
CVE-2016-0778 has a CVSS score of 8.1/10 (HIGH severity). The EPSS model estimates a 20.37% probability of exploitation in the next 30 days.
How do I fix CVE-2016-0778?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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