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CVE-2017-18258

Published: 8 April 2018

The xz_head function in xzlib.c in libxml2 before 2.9.6 allows remote attackers to cause a denial of service (memory consumption) via a crafted LZMA file, because the decoder functionality does not restrict memory usage to what is required for a legitimate file.

Notes

AuthorNote
leosilva
precise/esm hasn't support for LZMA
ccdm94
the fix for this issue seems to introduce the vulnerability
related to CVE-2018-9251.

Priority

Low

Cvss 3 Severity Score

6.5

Score breakdown

Status

Package Release Status
libxml2
Launchpad, Ubuntu, Debian
artful Ignored
(end of life)
trusty
Released (2.9.1+dfsg1-3ubuntu4.13)
bionic
Released (2.9.4+dfsg1-6.1ubuntu1.2)
upstream
Released (2.9.6)
xenial
Released (2.9.3+dfsg1-1ubuntu0.6)
Patches:
upstream: https://git.gnome.org/browse/libxml2/commit/?id=e2a9122b8dde53d320750451e9907a7dcb2ca8bb

Severity score breakdown

Parameter Value
Base score 6.5
Attack vector Network
Attack complexity Low
Privileges required None
User interaction Required
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H