Vulnerability Description
curl before version 7.61.1 is vulnerable to a buffer overrun in the NTLM authentication code. The internal function Curl_ntlm_core_mk_nt_hash multiplies the length of the password by two (SUM) to figure out how large temporary storage area to allocate from the heap. The length value is then subsequently used to iterate over the password and generate output into the allocated storage buffer. On systems with a 32 bit size_t, the math to calculate SUM triggers an integer overflow when the password length exceeds 2GB (2^31 bytes). This integer overflow usually causes a very small buffer to actually get allocated instead of the intended very huge one, making the use of that buffer end up in a heap buffer overflow. (This bug is almost identical to CVE-2017-8816.)
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Haxx | Libcurl | < 7.61.1 |
| Canonical | Ubuntu Linux | 12.04 |
| Debian | Debian Linux | 9.0 |
| Redhat | Enterprise Linux | 6.0 |
Related Weaknesses (CWE)
References
- http://www.securitytracker.com/id/1041605Third Party AdvisoryVDB Entry
- https://access.redhat.com/errata/RHSA-2018:3558Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:1880
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-14618Issue Tracking
- https://cert-portal.siemens.com/productcert/pdf/ssa-436177.pdf
- https://curl.haxx.se/docs/CVE-2018-14618.htmlVendor Advisory
- https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2018-0014Third Party Advisory
- https://security.gentoo.org/glsa/201903-03Third Party Advisory
- https://usn.ubuntu.com/3765-1/Third Party Advisory
- https://usn.ubuntu.com/3765-2/Third Party Advisory
- https://www.debian.org/security/2018/dsa-4286Third Party Advisory
- http://www.securitytracker.com/id/1041605Third Party AdvisoryVDB Entry
- https://access.redhat.com/errata/RHSA-2018:3558Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:1880
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-14618Issue Tracking
FAQ
What is CVE-2018-14618?
CVE-2018-14618 is a vulnerability with a CVSS score of 7.5 (HIGH). curl before version 7.61.1 is vulnerable to a buffer overrun in the NTLM authentication code. The internal function Curl_ntlm_core_mk_nt_hash multiplies the length of the password by two (SUM) to figu...
How severe is CVE-2018-14618?
CVE-2018-14618 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2018-14618?
Check the references section above for vendor advisories and patch information. Affected products include: Haxx Libcurl, Canonical Ubuntu Linux, Debian Debian Linux, Redhat Enterprise Linux.