[Secure-testing-commits] [Git][security-tracker-team/security-tracker][master] Clarify status for CVE-2018-9251/libxml2

[Salvatore Bonaccorso]

Salvatore Bonaccorso pushed to branch master at Debian Security Tracker / security-tracker


Commits:
19691629 by Salvatore Bonaccorso at 2018-04-08T21:03:00+02:00
Clarify status for CVE-2018-9251/libxml2

Add CVE-2017-18258 at the same time. The situation has been clarified.
So CVE-2018-9251 is only an issue if upstream commit
https://git.gnome.org/browse/libxml2/commit/?id=e2a9122b8dde53d320750451e9907a7dcb2ca8bb
is applied (which was assigned CVE-2017-18258).

- - - - -


1 changed file:

- data/CVE/list


Changes:

=====================================
data/CVE/list
=====================================
--- a/data/CVE/list
+++ b/data/CVE/list
@@ -1342,13 +1342,21 @@ CVE-2018-9252 (JasPer 2.0.14 allows denial of service via a reachable assertion 
 	NOTE: https://github.com/mdadams/jasper/issues/173
 	NOTE: Negligable impact
 CVE-2018-9251 (The xz_decomp function in xzlib.c in libxml2 2.9.8, if --with-lzma is ...)
-	- libxml2 <unfixed> (bug #895195)
+	- libxml2 <not-affected> (Fix for CVE-2017-18258 not applied, cf. bug #895195)
 	NOTE: https://bugzilla.gnome.org/show_bug.cgi?id=794914
 	NOTE: Before upstream commit https://git.gnome.org/browse/libxml2/commit/?id=e2a9122b8dde53d320750451e9907a7dcb2ca8bb
 	NOTE: the memlimit argument to lzma_auto_decoder was set to UINT64_MAX, possibly
 	NOTE: allowing a malicious LZMA compressed files to consume large amounts of memory
-	NOTE: when decompressed. After upstream commit e2a9122b8dde53d320750451e9907a7dcb2ca8bb
-	NOTE: with xz_decomp is more prominently uncovered.
+	NOTE: when decompressed. Setting memlimit to UINT64_MAX the limiter is effectively
+	NOTE: disabled and "lzma_auto_decoder(&state->strm, UINT64_MAX, 0)" can never result
+	NOTE: in LZMA_MEMLIMIT_ERROR outcome because there is no way to exceed UINT64_MAX.
+	NOTE: Thus CVE-2018-9251 is only affecting libxml2 if e2a9122b8dde53d320750451e9907a7dcb2ca8bb
+CVE-2017-18258 [Set memory limit for LZMA decompression]
+	- libxml2 <unfixed>
+	NOTE: https://bugzilla.gnome.org/show_bug.cgi?id=786696
+	NOTE: Fixed by: https://git.gnome.org/browse/libxml2/commit/?id=e2a9122b8dde53d320750451e9907a7dcb2ca8bb
+	NOTE: When fixing this issue make sure to not open CVE-2018-9251 and apply
+	NOTE: the fix for CVE-2018-9251 / https://bugzilla.gnome.org/show_bug.cgi?id=794914
 CVE-2018-9250
 	RESERVED
 CVE-2018-9249 (FiberHome VDSL2 Modem HG 150-UB devices allow authentication bypass by ...)



View it on GitLab: https://salsa.debian.org/security-tracker-team/security-tracker/commit/196916297e9eb45b27cf9291d94e40229f9e55fe

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