MGASA-2018-0369 - Updated libxkbcommon packages fix security vulnerabilities

Publication date: 07 Sep 2018
URL: https://advisories.mageia.org/MGASA-2018-0369.html
Type: security
Affected Mageia releases: 6
CVE: CVE-2018-15853,
     CVE-2018-15854,
     CVE-2018-15855,
     CVE-2018-15856,
     CVE-2018-15857,
     CVE-2018-15858,
     CVE-2018-15859,
     CVE-2018-15861,
     CVE-2018-15862,
     CVE-2018-15863,
     CVE-2018-15864

Updated libxkbcommon packages fix security vulnerabilities:

Endless recursion exists in xkbcomp/expr.c in xkbcommon and libxkbcommon
before 0.8.1, which could be used by local attackers to crash xkbcommon
users by supplying a crafted keymap file that triggers boolean negation
(CVE-2018-15853).

Unchecked NULL pointer usage in xkbcommon before 0.8.1 could be used by
local attackers to crash (NULL pointer dereference) the xkbcommon parser
by supplying a crafted keymap file, because geometry tokens were
desupported incorrectly (CVE-2018-15854).

Unchecked NULL pointer usage in xkbcommon before 0.8.1 could be used by
local attackers to crash (NULL pointer dereference) the xkbcommon parser
by supplying a crafted keymap file, because the XkbFile for an xkb_geometry
section was mishandled (CVE-2018-15855).

An infinite loop when reaching EOL unexpectedly in compose/parser.c (aka
the keymap parser) in xkbcommon before 0.8.1 could be used by local
attackers to cause a denial of service during parsing of crafted keymap
files (CVE-2018-15856).

An invalid free in ExprAppendMultiKeysymList in xkbcomp/ast-build.c in
xkbcommon before 0.8.1 could be used by local attackers to crash xkbcommon
keymap parsers or possibly have unspecified other impact by supplying a
crafted keymap file (CVE-2018-15857).

Unchecked NULL pointer usage when handling invalid aliases in
CopyKeyAliasesToKeymap in xkbcomp/keycodes.c in xkbcommon before 0.8.1
could be used by local attackers to crash (NULL pointer dereference) the
xkbcommon parser by supplying a crafted keymap file (CVE-2018-15858).

Unchecked NULL pointer usage when parsing invalid atoms in ExprResolveLhs
in xkbcomp/expr.c in xkbcommon before 0.8.2 could be used by local
attackers to crash (NULL pointer dereference) the xkbcommon parser by
supplying a crafted keymap file, because lookup failures are mishandled
(CVE-2018-15859).

Unchecked NULL pointer usage in ExprResolveLhs in xkbcomp/expr.c in
xkbcommon before 0.8.2 could be used by local attackers to crash (NULL
pointer dereference) the xkbcommon parser by supplying a crafted keymap
file that triggers an xkb_intern_atom failure (CVE-2018-15861).

Unchecked NULL pointer usage in LookupModMask in xkbcomp/expr.c in
xkbcommon before 0.8.2 could be used by local attackers to crash (NULL
pointer dereference) the xkbcommon parser by supplying a crafted keymap
file with invalid virtual modifiers (CVE-2018-15862).

Unchecked NULL pointer usage in ResolveStateAndPredicate in
xkbcomp/compat.c in xkbcommon before 0.8.2 could be used by local attackersto crash (NULL pointer dereference) the xkbcommon parser by supplying a
crafted keymap file with a no-op modmask expression (CVE-2018-15863).

Unchecked NULL pointer usage in resolve_keysym in xkbcomp/parser.y in
xkbcommon before 0.8.2 could be used by local attackers to crash (NULL
pointer dereference) the xkbcommon parser by supplying a crafted keymap
file, because a map access attempt can occur for a map that was never
created (CVE-2018-15864).

References:
- https://bugs.mageia.org/show_bug.cgi?id=23506
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/thread/377JCLG64STYRNYZZ4B5QKGX2MAW6JUX/
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-15853
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-15854
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-15855
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-15856
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-15857
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-15858
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-15859
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-15861
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-15862
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-15863
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-15864

SRPMS:
- 6/core/libxkbcommon-0.8.2-1.mga6