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CVE-2023-52618

Disclosure Date: March 18, 2024 •
CVE-2023-52618
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Description

In the Linux kernel, the following vulnerability has been resolved:

block/rnbd-srv: Check for unlikely string overflow

Since “dev_search_path” can technically be as large as PATH_MAX,
there was a risk of truncation when copying it and a second string
into “full_path” since it was also PATH_MAX sized. The W=1 builds were
reporting this warning:

drivers/block/rnbd/rnbd-srv.c: In function ‘process_msg_open.isra’:
drivers/block/rnbd/rnbd-srv.c:616:51: warning: ‘%s’ directive output may be truncated writing up to 254 bytes into a region of size between 0 and 4095 [-Wformat-truncation=]
616 | snprintf(full_path, PATH_MAX, “%s/%s”,

  |                                                   ^~

In function ‘rnbd_srv_get_full_path’,

inlined from 'process_msg_open.isra' at drivers/block/rnbd/rnbd-srv.c:721:14: drivers/block/rnbd/rnbd-srv.c:616:17: note: 'snprintf' output between 2 and 4351 bytes into a destination of size 4096

616 | snprintf(full_path, PATH_MAX, “%s/%s”,

  |                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

617 | dev_search_path, dev_name);

  |                          ~~~~~~~~~~~~~~~~~~~~~~~~~~

To fix this, unconditionally check for truncation (as was already done
for the case where “%SESSNAME%” was present).

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General Information

Offensive Application
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Vulnerable Versions
Linux 95bc866c1197
Linux not down converted
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Vendors

  • Linux

Products

  • Linux
Technical Analysis