An out of bounds read flaw was discovered in libssh2 before 1.8.1 in the _libssh2_packet_require and _libssh2_packet_requirev functions. A remote attacker who compromises a SSH server may be able to cause a Denial of Service or read data in the client memory.

References

• https://nvd.nist.gov/vuln/detail/CVE-2019-3859
• https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3859
• https://lists.debian.org/debian-lts-announce/2019/03/msg00032.html
• https://lists.debian.org/debian-lts-announce/2019/04/msg00006.html
• https://lists.debian.org/debian-lts-announce/2019/07/msg00024.html
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/5DK6VO2CEUTAJFYIKWNZKEKYMYR3NO2O/
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/XCWEA5ZCLKRDUK62QVVYMFWLWKOPX3LO/
• https://seclists.org/bugtraq/2019/Apr/25
• https://seclists.org/bugtraq/2019/Mar/25
• https://security.netapp.com/advisory/ntap-20190327-0005/
• https://www.broadcom.com/support/fibre-channel-networking/security-advisories/brocade-security-advisory-2019-767
• https://www.debian.org/security/2019/dsa-4431
• https://www.libssh2.org/CVE-2019-3859.html
• https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html
• http://lists.opensuse.org/opensuse-security-announce/2019-03/msg00040.html
• http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00003.html
• http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00102.html
• http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00103.html
• http://packetstormsecurity.com/files/152136/Slackware-Security-Advisory-libssh2-Updates.html
• http://www.openwall.com/lists/oss-security/2019/03/18/3
• http://www.securityfocus.com/bid/107485