Buffer overflow in Linux Kernel
CVE-2017-17806
The HMAC implementation (crypto/hmac.c) in the Linux kernel before 4.14.8 does not validate that the underlying cryptographic hash algorithm is unkeyed, allowing a local attacker able to use the AF_ALG-based hash interface (CONFIG_CRYPTO_USER_API_HASH) and the SHA-3 hash algorithm (CONFIG_CRYPTO_SHA3) to cause a kernel stack buffer overflow by executing a crafted sequence of system calls that encounter a missing SHA-3 initialization.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.006 (45.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 46th percentile — 45.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: -0.000
Affected products
- Linux Kernel
- openSUSE Project Leap — versions 42.3
- Canonical Ubuntu Linux — versions 12.04, 14.04, 16.04
- Debian Linux — versions 8.0, 9.0
- openSUSE Leap — versions 42.2
- SUSE Linux Enterprise Desktop — versions 12
- SUSE Linux Enterprise Server — versions 11, 12
- SUSE Linux Enterprise Server For Raspberry Pi — versions 12
Weakness classification (CWE)
Public proof-of-concept exploits
References
- usn.ubuntu.com/3617-1/ (vendor-advisory, Third Party Advisory)
- usn.ubuntu.com/3619-2/ (vendor-advisory, Third Party Advisory)
- www.debian.org/security/2018/dsa-4082 (vendor-advisory, Third Party Advisory)
- usn.ubuntu.com/3617-3/ (vendor-advisory, Third Party Advisory)
- lists.debian.org/debian-lts-announce/2018/01/msg00004.html (mailing-list, Third Party Advisory)
- lists.opensuse.org/opensuse-security-announce/2018-01/msg00008.html (vendor-advisory, Patch, Third Party Advisory, Issue Tracking)
- usn.ubuntu.com/3583-2/ (vendor-advisory, Third Party Advisory)
- lists.opensuse.org/opensuse-security-announce/2018-01/msg00007.html (vendor-advisory, Patch, Third Party Advisory, Issue Tracking)
- github.com/torvalds/linux/commit/af3ff8045bbf3e32f1a448542e73abb4c8ceb6f1 (Patch)
- usn.ubuntu.com/3632-1/ (vendor-advisory, Third Party Advisory)
Frequently asked questions
- What is CVE-2017-17806?
- CVE-2017-17806 is a high-severity vulnerability in Linux Kernel, classified under Out-of-bounds Write. CVSS score: 7.8/10. Published 2017-12-20.
- How severe is CVE-2017-17806?
- High severity. CVSS v3 base score is 7.8 out of 10.
- Is CVE-2017-17806 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.