libgit2: CVE-2018-10887: integer overflow leads to out-of-bounds read in git_delta_apply, allowing to read before base array

Debian Bug report logs - #903509
libgit2: CVE-2018-10887: integer overflow leads to out-of-bounds read in git_delta_apply, allowing to read before base array

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Message #5 received at submit@bugs.debian.org (full text, mbox, reply):

From: Salvatore Bonaccorso <carnil@debian.org>

To: Debian Bug Tracking System <submit@bugs.debian.org>

Subject: libgit2: CVE-2018-10887: integer overflow leads to out-of-bounds read in git_delta_apply, allowing to read before base array

Date: Tue, 10 Jul 2018 22:06:10 +0200

Source: libgit2
Version: 0.26.0+dfsg.1-1.2
Severity: important
Tags: security upstream

Hi,

The following vulnerability was published for libgit2.

CVE-2018-10887[0]:
| A flaw was found in libgit2 before version 0.27.3. It has been
| discovered that an unexpected sign extension in git_delta_apply
| function in delta.c file may lead to an integer overflow which in turn
| leads to an out of bound read, allowing to read before the base
| object. An attacker may use this flaw to leak memory addresses or
| cause a Denial of Service.

If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2018-10887
    https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-10887
[1] https://github.com/libgit2/libgit2/commit/3f461902dc1072acb8b7607ee65d0a0458ffac2a
[2] https://github.com/libgit2/libgit2/commit/c1577110467b701dcbcf9439ac225ea851b47d22

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore

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