CVE-2023-1667: Null Pointer Dereference
First published: Mon Mar 27 2023(Updated: )
A NULL pointer dereference was found In libssh during re-keying with algorithm guessing. This issue may allow an authenticated client to cause a denial of service.
Credit: secalert@redhat.com secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/libssh | <0:0.9.6-10.el8_8 | 0:0.9.6-10.el8_8 |
| Libssh Libssh | >=0.9.1<=0.9.6 | |
| Libssh Libssh | >=0.10.0<=0.10.4 | |
| Fedoraproject Fedora | =37 | |
| Debian Debian Linux | =10.0 | |
| Redhat Enterprise Linux | =8.0 | |
| Redhat Enterprise Linux | =9.0 | |
| redhat/libssh | <0.10.5 | 0.10.5 |
| redhat/libssh | <0.9.7 | 0.9.7 |
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Reference Links
- https://bugzilla.redhat.com/show_bug.cgi?id=2182199
- http://www.libssh.org/security/advisories/CVE-2023-1667.txt
- https://access.redhat.com/security/cve/CVE-2023-1667
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/27PD44ALQTZXX7K6JAM3BXBUHYA6DFFN/
- https://lists.debian.org/debian-lts-announce/2023/05/msg00029.html
- https://www.cve.org/CVERecord?id=CVE-2023-1667 https://nvd.nist.gov/vuln/detail/CVE-2023-1667 http://www.libssh.org/security/advisories/CVE-2023-1667.txt
- https://access.redhat.com/errata/RHSA-2023:3839
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/27PD44ALQTZXX7K6JAM3BXBUHYA6DFFN/
- https://security.gentoo.org/glsa/202312-05
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2196099
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2196098
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2182202#c5
- https://www.libssh.org/2023/05/04/libssh-0-10-5-and-libssh-0-9-7-security-releases/
- https://access.redhat.com/security/cve/cve-2023-1667
- https://access.redhat.com/errata/RHSA-2023:6643
- https://access.redhat.com/errata/RHSA-2024:0538
Frequently Asked Questions
What is CVE-2023-1667?
CVE-2023-1667 is a vulnerability found in libssh that can cause a denial of service.
How severe is CVE-2023-1667?
CVE-2023-1667 has a severity rating of 6.5, which is considered medium.
How does CVE-2023-1667 affect libssh?
CVE-2023-1667 affects libssh during re-keying with algorithm guessing.
How can an authenticated client exploit CVE-2023-1667?
An authenticated client can exploit CVE-2023-1667 to cause a denial of service.
Where can I find more information about CVE-2023-1667?
You can find more information about CVE-2023-1667 at the following references: [https://bugzilla.redhat.com/show_bug.cgi?id=2182199](https://bugzilla.redhat.com/show_bug.cgi?id=2182199), [http://www.libssh.org/security/advisories/CVE-2023-1667.txt](http://www.libssh.org/security/advisories/CVE-2023-1667.txt), [https://access.redhat.com/security/cve/CVE-2023-1667](https://access.redhat.com/security/cve/CVE-2023-1667).
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