CVE-2021-38185
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (4.17%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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.
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- EPSS
- 4.17% probability · 90th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-190
- Affected
- gnu/cpio
- Source
- cve@mitre.org
References
- https://git.savannah.gnu.org/cgit/cpio.git/commit/?id=dd96882877721703e19272fe25034560b794061bPatch, Third Party Advisory
- https://github.com/fangqyi/cpiopwnExploit, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2023/06/msg00007.html
- https://lists.gnu.org/archive/html/bug-cpio/2021-08/msg00000.htmlExploit, Mailing List, Vendor Advisory
- https://lists.gnu.org/archive/html/bug-cpio/2021-08/msg00002.htmlExploit, Mailing List, Vendor Advisory
- https://git.savannah.gnu.org/cgit/cpio.git/commit/?id=dd96882877721703e19272fe25034560b794061bPatch, Third Party Advisory
- https://github.com/fangqyi/cpiopwnExploit, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2023/06/msg00007.html
- https://lists.gnu.org/archive/html/bug-cpio/2021-08/msg00000.htmlExploit, Mailing List, Vendor Advisory
- https://lists.gnu.org/archive/html/bug-cpio/2021-08/msg00002.htmlExploit, Mailing List, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.