Buffer overflow in GNU Glibc
CVE-2017-18269
An SSE2-optimized memmove implementation for i386 in sysdeps/i386/i686/multiarch/memcpy-sse2-unaligned.S in the GNU C Library (aka glibc or libc6) 2.21 through 2.27 does not correctly perform the overlapping memory check if the source memory range spans the middle of the address space, resulting in corrupt data being produced by the copy operation. This may disclose information to context-dependent attackers, or result in a denial of service, or, possibly, code execution.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.046 (91.6th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 92nd percentile — 91.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.047 · newest: 0.046 · change: -0.001
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- sourceware.org/git/gitweb.cgi
- github.com/fingolfin/memmove-bug (Third Party Advisory)
- sourceware.org/bugzilla/show_bug.cgi (Issue Tracking)
- security.netapp.com/advisory/ntap-20190329-0001/
- security.netapp.com/advisory/ntap-20190401-0001/
- usn.ubuntu.com/4416-1/ (vendor-advisory)
Frequently asked questions
- What is CVE-2017-18269?
- CVE-2017-18269 is a critical-severity vulnerability in GNU Glibc, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 9.8/10. Published 2018-05-18.
- How severe is CVE-2017-18269?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2017-18269 known to be exploited?
- 4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.