CVE-2020-16135: Null Pointer Dereference
First published: Wed Jul 29 2020(Updated: )
libssh 0.9.4 has a NULL pointer dereference in tftpserver.c if ssh_buffer_new returns NULL.
Credit: cve@mitre.org cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Libssh Libssh | =0.9.4 | |
| Debian Debian Linux | =9.0 | |
| Fedoraproject Fedora | =32 | |
| Fedoraproject Fedora | =33 | |
| Canonical Ubuntu Linux | =16.04 | |
| Canonical Ubuntu Linux | =18.04 | |
| Canonical Ubuntu Linux | =20.04 | |
| Oracle Communications Cloud Native Core Policy | =1.15.0 | |
| IBM QRadar SIEM | <=7.5.0 GA | |
| IBM QRadar SIEM | <=7.4.3 GA - 7.4.3 FP4 | |
| IBM QRadar SIEM | <=7.3.3 GA - 7.3.3 FP10 | |
| ubuntu/libssh | <0.8.0~20170825.94 | 0.8.0~20170825.94 |
| ubuntu/libssh | <0.9.3-2ubuntu2.1 | 0.9.3-2ubuntu2.1 |
| ubuntu/libssh | <0.6.3-4.3ubuntu0.6 | 0.6.3-4.3ubuntu0.6 |
| debian/libssh | <=0.8.7-1+deb10u1<=0.8.7-1+deb10u2 | 0.9.8-0+deb11u1 0.10.6-0+deb12u1 0.10.6-2 |
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Reference Links
- https://exchange.xforce.ibmcloud.com/vulnerabilities/186148
- https://www.ibm.com/support/pages/node/6574787 (Advisory)
- https://bugs.libssh.org/T232
- https://bugs.libssh.org/rLIBSSHe631ebb3e2247dd25e9678e6827c20dc73b73238
- https://gitlab.com/libssh/libssh-mirror/-/merge_requests/120
- https://lists.debian.org/debian-lts-announce/2020/07/msg00034.html
- https://usn.ubuntu.com/4447-1/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JNW5GBC6JFN76VEWQXMLT5F7VCZ5AJ2E/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/FCIKQRKXAAB4HMWM62EPZJ4DVBHIIEG6/
- https://security.gentoo.org/glsa/202011-05
- https://www.oracle.com/security-alerts/cpuapr2022.html
- https://launchpad.net/bugs/cve/CVE-2020-16135
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FCIKQRKXAAB4HMWM62EPZJ4DVBHIIEG6/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JNW5GBC6JFN76VEWQXMLT5F7VCZ5AJ2E/
- https://bugs.gentoo.org/734624
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1862457
- https://gitlab.com/libssh/libssh-mirror/-/commit/533d881b0f4b24c72b35ecc97fa35d295d063e53
- https://gitlab.com/libssh/libssh-mirror/-/commit/2782cb0495b7450bd8fe43ce4af886b66fea6c40
- https://gitlab.com/libssh/libssh-mirror/-/commit/10b3ebbe61a7031a3dae97f05834442220447181
- https://gitlab.com/libssh/libssh-mirror/-/commit/245ad744b5ab0582fef7cf3905a717b791d7e08b
- https://access.redhat.com/errata/RHSA-2021:4387
- https://access.redhat.com/errata/RHSA-2021:4750
- https://bugzilla.redhat.com/show_bug.cgi?id=1862456
- https://security-tracker.debian.org/tracker/CVE-2020-16135
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-16135
- https://gitlab.com/libssh/libssh-mirror/-/merge_requests/120/diffs?commit_id=1493b4466fa394b321d196ad63dd6a4fa395d337
- https://gitlab.com/libssh/libssh-mirror/-/merge_requests/120/diffs?commit_id=dbfb7f44aa905a7103bdde9a198c1e9b0f480c2e
- https://gitlab.com/libssh/libssh-mirror/-/merge_requests/120/diffs?commit_id=65ae496222018221080dd753a52f6d70bf3ca5f3
- https://gitlab.com/libssh/libssh-mirror/-/merge_requests/120/diffs?commit_id=df0acab3a077bd8ae015e3e8b4c71ff31b5900fe
- https://ubuntu.com/security/notices/USN-4447-1
- https://nvd.nist.gov/vuln/detail/CVE-2020-16135
- https://ubuntu.com/security/CVE-2020-16135
Frequently Asked Questions
What is CVE-2020-16135?
CVE-2020-16135 is a vulnerability in Libssh that can lead to a denial of service by causing the application to crash.
What software is affected by CVE-2020-16135?
CVE-2020-16135 affects IBM QRadar SIEM versions 7.5.0 GA, 7.4.3 GA - 7.4.3 FP4, and 7.3.3 GA - 7.3.3 FP10.
How severe is CVE-2020-16135?
CVE-2020-16135 has a severity rating of 7.5 (high).
How can I fix CVE-2020-16135?
To fix CVE-2020-16135, you can apply the official patches provided by IBM for the affected versions of QRadar SIEM. You can find the patches on the IBM Support website.
Where can I find more information about CVE-2020-16135?
You can find more information about CVE-2020-16135 on the following websites: [Bugzilla](https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1862457), [Gentoo](https://bugs.gentoo.org/734624), and [GitLab](https://gitlab.com/libssh/libssh-mirror/-/commit/533d881b0f4b24c72b35ecc97fa35d295d063e53).
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