Bug 2176462 (CVE-2023-1170) - CVE-2023-1170 vim: Heap-based Buffer Overflow
Summary: CVE-2023-1170 vim: Heap-based Buffer Overflow
Keywords:
Status: NEW
Alias: CVE-2023-1170
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Nobody
QA Contact:
URL:
Whiteboard:
Depends On: 2176463 2179903 2179904
Blocks: 2177866
TreeView+ depends on / blocked
 
Reported: 2023-03-08 13:04 UTC by Pedro Sampaio
Modified: 2023-07-07 08:31 UTC (History)
2 users (show)

Fixed In Version: vim 9.0.1376
Doc Type: If docs needed, set a value
Doc Text:
A heap-based buffer overflow vulnerability was found in Vim's utf_ptr2char() function of the src/mbyte.c file. This flaw occurs because there is access to invalid memory with put in visual block mode. An attacker can trick a user into opening a specially crafted file, triggering an out-of-bounds read that causes an application to crash, leading to a denial of service.
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Description Pedro Sampaio 2023-03-08 13:04:56 UTC 
Heap-based Buffer Overflow in GitHub repository vim/vim prior to 9.0.1376.

References:

https://github.com/vim/vim/commit/1c73b65229c25e3c1fd8824ba958f7cc4d604f9c
https://huntr.dev/bounties/286e0090-e654-46d2-ac60-29f81799d0a4
Comment 1 Pedro Sampaio 2023-03-08 13:05:11 UTC 
Created vim tracking bugs for this issue:

Affects: fedora-all [bug 2176463]
Comment 2 Zdenek Dohnal 2023-03-09 12:47:19 UTC 
Hi,

the reproducer seems to be a vimscript combination - would you mind explaining why the vulnerability is not low, but medium?
Comment 3 Pedro Sampaio 2023-03-13 18:04:13 UTC 
In reply to comment #2:
> Hi,
> 
> the reproducer seems to be a vimscript combination - would you mind
> explaining why the vulnerability is not low, but medium?

Initial triage set it to medium by description. Lowered to low now.
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