CVE-2019-17498

high
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Description

In libssh2 v1.9.0 and earlier versions, the SSH_MSG_DISCONNECT logic in packet.c has an integer overflow in a bounds check, enabling an attacker to specify an arbitrary (out-of-bounds) offset for a subsequent memory read. A crafted SSH server may be able to disclose sensitive information or cause a denial of service condition on the client system when a user connects to the server.

References

http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00026.html

https://blog.semmle.com/libssh2-integer-overflow-CVE-2019-17498/

https://github.com/kevinbackhouse/SecurityExploits/tree/8cbdbbe6363510f7d9ceec685373da12e6fc752d/libssh2/out_of_bounds_read_disconnect_CVE-2019-17498

https://github.com/libssh2/libssh2/blob/42d37aa63129a1b2644bf6495198923534322d64/src/packet.c#L480

https://github.com/libssh2/libssh2/commit/dedcbd106f8e52d5586b0205bc7677e4c9868f9c

https://lists.debian.org/debian-lts-announce/2019/11/msg00010.html

https://lists.fedoraproject.org/archives/list/[email protected]/message/22H4Q5XMGS3QNSA7OCL3U7UQZ4NXMR5O/

https://lists.fedoraproject.org/archives/list/[email protected]/message/TY7EEE34RFKCTXTMBQQWWSLXZWSCXNDB/

Details

Source: MITRE

Published: 2019-10-21

Updated: 2020-10-14

Type: CWE-190

Risk Information

CVSS v2

Base Score: 5.8

Vector: AV:N/AC:M/Au:N/C:P/I:N/A:P

Impact Score: 4.9

Exploitability Score: 8.6

Severity: MEDIUM

CVSS v3

Base Score: 8.1

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H

Impact Score: 5.2

Exploitability Score: 2.8

Severity: HIGH

Tenable Plugins

View all (27 total)

IDNameProductFamilySeverity
154498NewStart CGSL CORE 5.05 / MAIN 5.05 : libssh2 Vulnerability (NS-SA-2021-0173)NessusNewStart CGSL Local Security Checks
high
150633SUSE SLES11 Security Update : libssh2_org (SUSE-SU-2019:14206-1)NessusSuSE Local Security Checks
high
147277NewStart CGSL CORE 5.04 / MAIN 5.04 : libssh2 Vulnerability (NS-SA-2021-0026)NessusNewStart CGSL Local Security Checks
high
143867SUSE SLED15 / SLES15 Security Update : libssh2_org (SUSE-SU-2020:3551-1)NessusSuSE Local Security Checks
high
143507openSUSE Security Update : libssh2_org (openSUSE-2020-2126)NessusSuSE Local Security Checks
high
143452openSUSE Security Update : libssh2_org (openSUSE-2020-2129)NessusSuSE Local Security Checks
high
142000Amazon Linux 2 : libssh2 (ALAS-2020-1531)NessusAmazon Linux Local Security Checks
high
141667Scientific Linux Security Update : libssh2 on SL7.x x86_64 (20201001)NessusScientific Linux Local Security Checks
high
141605CentOS 7 : libssh2 (CESA-2020:3915)NessusCentOS Local Security Checks
high
141048RHEL 7 : libssh2 (RHSA-2020:3915)NessusRed Hat Local Security Checks
high
138250SUSE SLED15 / SLES15 Security Update : libssh2_org (SUSE-SU-2019:2900-2)NessusSuSE Local Security Checks
high
134748EulerOS Virtualization 3.0.2.2 : libssh2 (EulerOS-SA-2020-1282)NessusHuawei Local Security Checks
high
134552EulerOS Virtualization for ARM 64 3.0.2.0 : libssh2 (EulerOS-SA-2020-1263)NessusHuawei Local Security Checks
high
133065Photon OS 3.0: Libssh2 PHSA-2020-3.0-0047NessusPhotonOS Local Security Checks
high
132973Photon OS 2.0: Libssh2 PHSA-2019-2.0-0196NessusPhotonOS Local Security Checks
high
132966Photon OS 1.0: Libssh2 PHSA-2019-1.0-0263NessusPhotonOS Local Security Checks
high
132843EulerOS Virtualization for ARM 64 3.0.5.0 : libssh2 (EulerOS-SA-2020-1089)NessusHuawei Local Security Checks
high
132153EulerOS 2.0 SP3 : libssh2 (EulerOS-SA-2019-2618)NessusHuawei Local Security Checks
high
131810EulerOS 2.0 SP5 : libssh2 (EulerOS-SA-2019-2536)NessusHuawei Local Security Checks
high
131626EulerOS 2.0 SP2 : libssh2 (EulerOS-SA-2019-2473)NessusHuawei Local Security Checks
high
131353EulerOS 2.0 SP8 : libssh2 (EulerOS-SA-2019-2287)NessusHuawei Local Security Checks
high
130980Debian DLA-1991-1 : libssh2 security updateNessusDebian Local Security Checks
high
130898SUSE SLED12 / SLES12 Security Update : libssh2_org (SUSE-SU-2019:2936-1)NessusSuSE Local Security Checks
high
130895openSUSE Security Update : libssh2_org (openSUSE-2019-2483)NessusSuSE Local Security Checks
high
130894openSUSE Security Update : libssh2_org (openSUSE-2019-2482)NessusSuSE Local Security Checks
high
130619SUSE SLED15 / SLES15 Security Update : libssh2_org (SUSE-SU-2019:2900-1)NessusSuSE Local Security Checks
high
130615Fedora 31 : libssh2 (2019-91529f19e4)NessusFedora Local Security Checks
high