Bug 1687303 (CVE-2019-3855)
| Summary: | CVE-2019-3855 libssh2: Integer overflow in transport read resulting in out of bounds write | ||
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| Product: | [Other] Security Response | Reporter: | Andrej Nemec <anemec> |
| Component: | vulnerability | Assignee: | Red Hat Product Security <security-response-team> |
| Status: | CLOSED ERRATA | QA Contact: | |
| Severity: | high | Docs Contact: | |
| Priority: | high | ||
| Version: | unspecified | CC: | bmcclain, dblechte, ddepaula, dfediuck, djuran, eedri, erik-fedora, jen, kdudka, mgoldboi, michal.skrivanek, mike, paul, rjones, rschiron, sbonazzo, security-response-team, sherold, thoger, yturgema |
| Target Milestone: | --- | Keywords: | Security |
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | libssh2 1.8.1 | Doc Type: | If docs needed, set a value |
| Doc Text: |
An integer overflow flaw which could lead to an out of bounds write was discovered in libssh2 in the way packets are read from the server. A remote attacker who compromises a SSH server may be able to execute code on the client system when a user connects to the server.
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Story Points: | --- |
| Clone Of: | Environment: | ||
| Last Closed: | 2019-06-10 10:50:06 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
| Bug Depends On: | 1688160, 1688161, 1688421, 1688422, 1690247, 1690248, 1690408, 1694991, 1696058, 1697684, 1697694, 1714646, 1719429, 1719430, 1724834 | ||
| Bug Blocks: | 1687317 | ||
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Description
Andrej Nemec
2019-03-11 08:52:40 UTC
Acknowledgments: Name: the libssh2 project Upstream: Chris Coulson (Canonical Ltd.) Function _libssh2_transport_read() in transport.c does not properly check the packet_length received from the server. A malicious server could send a large packet_length value and cause an integer overflow when computing total_num, which would result in a buffer overflow later on. The attacker needs to: - trick the user to connect to a malicious server or - trick the user to connect to a compromised server or - intercept and modify the traffic For these reasons User Interaction (UI) is set to Required(R) and Attack Complexity (AC) is set to High (H). Statement: This flaw was present in libssh2 packages included in Red Hat Virtualization Hypervisor and Management Appliance, however libssh2 in these hosts is never exposed to malicious clients or servers. Upstream Patch: https://libssh2.org/1.8.0-CVE/CVE-2019-3855.patch External References: https://www.libssh2.org/CVE-2019-3855.html Created libssh tracking bugs for this issue: Affects: fedora-all [bug 1690246] Created mingw-libssh2 tracking bugs for this issue: Affects: fedora-all [bug 1690247] Created mingw-libssh2 tracking bugs for this issue: Affects: epel-7 [bug 1690248] Created libssh2 tracking bugs for this issue: Affects: fedora-all [bug 1690408] This issue has been addressed in the following products: Red Hat Enterprise Linux 7 Via RHSA-2019:0679 https://access.redhat.com/errata/RHSA-2019:0679 This issue has been addressed in the following products: Red Hat Enterprise Linux 8 Via RHSA-2019:1175 https://access.redhat.com/errata/RHSA-2019:1175 This issue has been addressed in the following products: Red Hat Enterprise Linux 6 Via RHSA-2019:1652 https://access.redhat.com/errata/RHSA-2019:1652 This issue has been addressed in the following products: Red Hat Enterprise Linux 7.5 Extended Update Support Via RHSA-2019:1791 https://access.redhat.com/errata/RHSA-2019:1791 This issue has been addressed in the following products: Red Hat Enterprise Linux 7.4 Extended Update Support Via RHSA-2019:1943 https://access.redhat.com/errata/RHSA-2019:1943 This issue has been addressed in the following products: Red Hat Enterprise Linux 7.3 Advanced Update Support Red Hat Enterprise Linux 7.3 Update Services for SAP Solutions Red Hat Enterprise Linux 7.3 Telco Extended Update Support Via RHSA-2019:2399 https://access.redhat.com/errata/RHSA-2019:2399 |