CVE-2018-1000001
Published: 11 January 2018
In glibc 2.26 and earlier there is confusion in the usage of getcwd() by realpath() which can be used to write before the destination buffer leading to a buffer underflow and potential code execution.
From the Ubuntu security team
libc does not account for all the possible return values from the kernel getcwd(2) syscall; arbitrary code execution may result from applications making further assumptions on the return value from the getcwd(3) libary function.
Priority
High
CVSS 3 base score: 7.8
Status
| Package | Release | Status |
|---|---|---|
|
dietlibc Launchpad, Ubuntu, Debian |
Upstream |
Not vulnerable
(vulnerable code not present)
|
| Ubuntu 20.04 LTS (Focal Fossa) |
Not vulnerable
(vulnerable code not present)
|
|
| Ubuntu 18.04 LTS (Bionic Beaver) |
Not vulnerable
(vulnerable code not present)
|
|
| Ubuntu 16.04 LTS (Xenial Xerus) |
Not vulnerable
(vulnerable code not present)
|
|
| Ubuntu 14.04 ESM (Trusty Tahr) |
Does not exist
(trusty was needs-triage)
|
|
|
eglibc Launchpad, Ubuntu, Debian |
Upstream |
Needed
|
| Ubuntu 20.04 LTS (Focal Fossa) |
Does not exist
|
|
| Ubuntu 18.04 LTS (Bionic Beaver) |
Does not exist
|
|
| Ubuntu 16.04 LTS (Xenial Xerus) |
Does not exist
|
|
| Ubuntu 14.04 ESM (Trusty Tahr) |
Released
(2.19-0ubuntu6.14)
|
|
|
glibc Launchpad, Ubuntu, Debian |
Upstream |
Needed
|
| Ubuntu 20.04 LTS (Focal Fossa) |
Not vulnerable
(2.26-0ubuntu2.1)
|
|
| Ubuntu 18.04 LTS (Bionic Beaver) |
Not vulnerable
(2.26-0ubuntu2.1)
|
|
| Ubuntu 16.04 LTS (Xenial Xerus) |
Released
(2.23-0ubuntu10)
|
|
| Ubuntu 14.04 ESM (Trusty Tahr) |
Does not exist
|
|
|
Patches: Upstream: https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=52a713fdd0a30e1bd79818e2e3c4ab44ddca1a94 |
||
|
musl Launchpad, Ubuntu, Debian |
Upstream |
Released
(1.1.19)
|
| Ubuntu 20.04 LTS (Focal Fossa) |
Not vulnerable
(1.1.19-1)
|
|
| Ubuntu 18.04 LTS (Bionic Beaver) |
Not vulnerable
(1.1.19-1)
|
|
| Ubuntu 16.04 LTS (Xenial Xerus) |
Ignored
(no security impact in musl)
|
|
| Ubuntu 14.04 ESM (Trusty Tahr) |
Does not exist
(trusty was needed)
|
|
|
Patches: Upstream: https://git.musl-libc.org/cgit/musl/commit/?id=23ddab8569ef8ae3488c1d67b6bccaa081c73245 |
||
Notes
| Author | Note |
|---|---|
| seth-arnold | I wonder where Go, busybox, and similar "do it ourselves" tools fit. I added dietlibc and musl to this page out of an abundance of caution. Someone should investigate. |
| sbeattie | introduced a regression in glusterfs geo-rep due to its usage of rsync. See redhat bug for compensating patch for rsync. |
| msalvatore | Unlike in glibc, this issue does not cause a buffer underflow in musl. Furthermore, realpath() does not call getcwd() in musl. |
References
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-1000001
- http://www.openwall.com/lists/oss-security/2018/01/11/5
- https://sourceware.org/bugzilla/show_bug.cgi?id=18203
- https://www.halfdog.net/Security/2017/LibcRealpathBufferUnderflow/
- https://usn.ubuntu.com/usn/usn-3534-1
- https://usn.ubuntu.com/usn/usn-3536-1
- https://lists.samba.org/archive/rsync/2018-February/031478.html
- NVD
- Launchpad
- Debian