Skip to content

ext/phar: add upper-bound check on LongLink entry size to prevent OOM DoS #22557

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
crystarm wants to merge 1 commit into
base: master
Choose a base branch
from
+7 −2
Open

ext/phar: add upper-bound check on LongLink entry size to prevent OOM DoS #22557

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
4 changes: 4 additions & 0 deletions NEWS
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -2,6 +2,10 @@ PHP NEWS
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
?? ??? ????, PHP 8.6.0alpha2

- Phar:
. Fixed bug GH-22556 (OOM DoS via oversized ././@LongLink entry in TAR phar).
(crystarm)

- DBA:
. Fixed OOB read on malformed length field in dba flatfile handler. (alhudz)

Expand Down
5 changes: 3 additions & 2 deletions ext/phar/tar.c
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -371,8 +371,9 @@ zend_result phar_parse_tarfile(
last_was_longlink = true;
/* support the ././@LongLink system for storing long filenames */

/* Check for overflow - bug 61065 */
if (entry.uncompressed_filesize == UINT_MAX || entry.uncompressed_filesize == 0) {
/* Check for empty or excessively large ././@LongLink filename entries - bug 61065 */
if (entry.uncompressed_filesize == 0
|| entry.uncompressed_filesize > UINT16_MAX) {
if (error) {
spprintf(error, 4096, "phar error: \"%s\" is a corrupted tar file (invalid entry size)", fname);
}
Expand Down