From: Peter Stephenson <p.w.stephenson@ntlworld.com>
To: Hamidreza <0xxparrot1@gmail.com>, zsh-workers@zsh.org
Subject: Re: User after Free in zftp module
Date: Fri, 10 May 2024 11:14:52 +0100 (BST) [thread overview]
Message-ID: <323009376.1482906.1715336092479@mail.virginmedia.com> (raw)
In-Reply-To: <CAMVY=Rtf0a5h-cxnXUSwHsMFR59_keKibcMSgdLUMrapUEbgZQ@mail.gmail.com>
> On 10/05/2024 09:26 BST Hamidreza <0xxparrot1@gmail.com> wrote:
> There is a security vulnerablity in zftp module.
>
> At
> `https://github.com/zsh-users/zsh/blob/acdcf9d8542a4461c0fceb98fdfef7380a128f78/Src/Modules/zftp.c#L3149`,
> `zfsessions` is begin freed but the variable is not set to NULL
> afterwards which leads to a "Use after Free" bug.
Thanks, that's clear.
pws
diff --git a/Src/Modules/zftp.c b/Src/Modules/zftp.c
index 0c26828..b60e5bf 100644
--- a/Src/Modules/zftp.c
+++ b/Src/Modules/zftp.c
@@ -3147,6 +3147,7 @@ zftp_cleanup(void)
lastmsg = NULL;
zfunsetparam("ZFTP_SESSION");
freelinklist(zfsessions, (FreeFunc) freesession);
+ zfsessions = NULL;
zfree(zfstatusp, sizeof(int)*zfsesscnt);
zfstatusp = NULL;
}
prev parent reply other threads:[~2024-05-10 10:15 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-05-10 8:26 Hamidreza
2024-05-10 10:14 ` Peter Stephenson [this message]
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