CVE-2021-38185
Published: 8 August 2021
GNU cpio through 2.13 allows attackers to execute arbitrary code via a crafted pattern file, because of a dstring.c ds_fgetstr integer overflow that triggers an out-of-bounds heap write. NOTE: it is unclear whether there are common cases where the pattern file, associated with the -E option, is untrusted data.
Notes
| Author | Note |
|---|---|
| mdeslaur | second commit fixes a regression. There seems to still be a regression even with the second commit as it is causing the kernel to FTBFS. Also see debian bugs for regressions. the third commit likely fixes the kernel regressions |
Priority
Status
| Package | Release | Status |
|---|---|---|
|
cpio Launchpad, Ubuntu, Debian |
upstream |
Released
(2.13+dfsg-5)
|
| impish |
Released
(2.13+dfsg-4ubuntu4)
|
|
| bionic |
Released
(2.12+dfsg-6ubuntu0.18.04.4)
|
|
| focal |
Released
(2.13+dfsg-2ubuntu0.3)
|
|
| hirsute |
Released
(2.13+dfsg-4ubuntu0.3)
|
|
| xenial |
Released
(2.11+dfsg-5ubuntu1.1+esm1)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only) |
|
| trusty |
Released
(2.11+dfsg-1ubuntu1.2+esm2)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only) |
|
| jammy |
Released
(2.13+dfsg-4ubuntu4)
|
|
| kinetic |
Released
(2.13+dfsg-4ubuntu4)
|
|
| lunar |
Released
(2.13+dfsg-4ubuntu4)
|
|
|
Patches: upstream: https://git.savannah.gnu.org/cgit/cpio.git/commit/?id=dd96882877721703e19272fe25034560b794061b upstream: https://git.savannah.gnu.org/cgit/cpio.git/commit/?id=dfc801c44a93bed7b3951905b188823d6a0432c8 upstream: https://git.savannah.gnu.org/cgit/cpio.git/commit/?id=236684f6deb3178043fe72a8e2faca538fa2aae1 |
||
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 7.8 |
| Attack vector | Local |
| Attack complexity | Low |
| Privileges required | None |
| User interaction | Required |
| Scope | Unchanged |
| Confidentiality | High |
| Integrity impact | High |
| Availability impact | High |
| Vector | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
References
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-38185
- https://github.com/fangqyi/cpiopwn
- https://lists.gnu.org/archive/html/bug-cpio/2021-08/msg00000.html
- https://lists.gnu.org/archive/html/bug-cpio/2021-08/msg00002.html
- https://ubuntu.com/security/notices/USN-5064-1
- https://ubuntu.com/security/notices/USN-5064-2
- https://ubuntu.com/security/notices/USN-5064-3
- NVD
- Launchpad
- Debian