CVE-2018-14633: Buffer Overflow
First published: Thu Sep 06 2018(Updated: )
A security flaw was found in the chap_server_compute_md5() function in the ISCSI target code in the Linux kernel in a way an authentication request from an ISCSI initiator is processed. An unauthenticated remote attacker can cause a stack buffer overflow and smash up to 17 bytes of the stack. An attack requires the ISCSI target to be enabled on the victim host. Depending on how the target's code was built (i.e. depending on a compiler, compile flags and hardware architecture) an attack may lead to a system crash and thus to a denial-of-service or possibly to a non-authorized access to data exported by an ISCSI target. Due to the nature of the flaw, privilege escalation cannot be fully ruled out, although we believe it is highly unlikely. References: <a href="https://seclists.org/oss-sec/2018/q3/270">https://seclists.org/oss-sec/2018/q3/270</a> Upstream patches: <a href="https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1816494330a8">https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1816494330a8</a> <a href="https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=8c39e2699f8a">https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=8c39e2699f8a</a>
Credit: secalert@redhat.com secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Linux kernel | >=3.1<3.16.59 | |
| Linux Linux kernel | >=3.17<3.18.124 | |
| Linux Linux kernel | >=3.19<4.4.159 | |
| Linux Linux kernel | >=4.5<4.9.130 | |
| Linux Linux kernel | >=4.10<4.14.73 | |
| Linux Linux kernel | >=4.15<4.18.11 | |
| Canonical Ubuntu Linux | =12.04 | |
| Canonical Ubuntu Linux | =14.04 | |
| Canonical Ubuntu Linux | =16.04 | |
| Canonical Ubuntu Linux | =18.04 | |
| Debian Debian Linux | =8.0 | |
| Debian Debian Linux | =9.0 | |
| Redhat Enterprise Linux Eus | =7.4 | |
| Redhat Enterprise Linux Eus | =7.6 | |
| Redhat Enterprise Linux Server | =7.0 | |
| Redhat Enterprise Linux Server Aus | =7.4 | |
| Redhat Enterprise Linux Server Aus | =7.6 | |
| Redhat Enterprise Linux Server Tus | =7.4 | |
| Redhat Enterprise Linux Server Tus | =7.6 | |
| Redhat Enterprise Linux Workstation | =7.0 | |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.115-1 6.1.119-1 6.11.10-1 6.12.3-1 |
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Reference Links
- http://www.securityfocus.com/bid/105388
- https://access.redhat.com/errata/RHSA-2018:3651
- https://access.redhat.com/errata/RHSA-2018:3666
- https://access.redhat.com/errata/RHSA-2019:1946
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-14633
- https://git.kernel.org/pub/scm/linux/kernel/git/mkp/scsi.git/commit/?h=4.19/scsi-fixes&id=1816494330a83f2a064499d8ed2797045641f92c
- https://git.kernel.org/pub/scm/linux/kernel/git/mkp/scsi.git/commit/?h=4.19/scsi-fixes&id=8c39e2699f8acb2e29782a834e56306da24937fe
- https://lists.debian.org/debian-lts-announce/2018/10/msg00003.html
- https://seclists.org/oss-sec/2018/q3/270
- https://usn.ubuntu.com/3775-1/
- https://usn.ubuntu.com/3775-2/
- https://usn.ubuntu.com/3776-1/
- https://usn.ubuntu.com/3776-2/
- https://usn.ubuntu.com/3777-1/
- https://usn.ubuntu.com/3777-2/
- https://usn.ubuntu.com/3777-3/
- https://usn.ubuntu.com/3779-1/
- https://www.debian.org/security/2018/dsa-4308
- https://git.kernel.org/pub/scm/linux/kernel/git/mkp/scsi.git/commit/?h=4.19/scsi-fixes&id=1816494330a83f2a064499d8ed2797045641f92c
- https://git.kernel.org/pub/scm/linux/kernel/git/mkp/scsi.git/commit/?h=4.19/scsi-fixes&id=8c39e2699f8acb2e29782a834e56306da24937fe
- https://launchpad.net/bugs/cve/CVE-2018-14633
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1816494330a8
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=8c39e2699f8a
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1632185
- https://bugzilla.redhat.com/show_bug.cgi?id=1626035
- https://www.openwall.com/lists/oss-security/2018/09/24/2
- https://security-tracker.debian.org/tracker/CVE-2018-14633
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-14633
- https://nvd.nist.gov/vuln/detail/CVE-2018-14633
- https://ubuntu.com/security/CVE-2018-14633
Frequently Asked Questions
What is CVE-2018-14633?
CVE-2018-14633 is a security flaw found in the chap_server_compute_md5() function in the ISCSI target code in the Linux kernel.
How does CVE-2018-14633 affect Linux systems?
CVE-2018-14633 can allow an unauthenticated remote attacker to cause a stack buffer overflow and potentially execute arbitrary code.
Which Linux distributions are affected by CVE-2018-14633?
Linux distributions with the Linux kernel version up to 4.19~ are affected by CVE-2018-14633.
What is the severity of CVE-2018-14633?
CVE-2018-14633 has a severity rating of medium.
How can I fix CVE-2018-14633?
To fix CVE-2018-14633, update the Linux kernel to version 4.19~ or later.
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