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…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (4.70%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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.
- CVSS 3.0
- 9.8 CRITICALCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 4.70% probability · 91th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-119
- Affected
- gnu/glibc
- Source
- cve@mitre.org
References
- https://github.com/fingolfin/memmove-bugThird Party Advisory
- https://security.netapp.com/advisory/ntap-20190329-0001/
- https://security.netapp.com/advisory/ntap-20190401-0001/
- https://sourceware.org/bugzilla/show_bug.cgi?id=22644Issue Tracking
- https://sourceware.org/git/gitweb.cgi?p=glibc.git%3Bh=cd66c0e584c6d692bc8347b5e72723d02b8a8ada
- https://usn.ubuntu.com/4416-1/
- https://github.com/fingolfin/memmove-bugThird Party Advisory
- https://security.netapp.com/advisory/ntap-20190329-0001/
- https://security.netapp.com/advisory/ntap-20190401-0001/
- https://sourceware.org/bugzilla/show_bug.cgi?id=22644Issue Tracking
- https://sourceware.org/git/gitweb.cgi?p=glibc.git%3Bh=cd66c0e584c6d692bc8347b5e72723d02b8a8ada
- https://usn.ubuntu.com/4416-1/
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.