An issue was discovered in libX11 through 1.6.5. Functions GetFPath.c:XGetFontPath, ListExt.c:XListExtensions and FontNames.c:XListFonts are vulnerable to an off-by-one error when parsing list of strings returned by malicious server responses, leading to DoS. References: http://www.openwall.com/lists/oss-security/2018/08/21/6 https://lists.x.org/archives/xorg-announce/2018-August/002916.html Upstream Patch: https://cgit.freedesktop.org/xorg/lib/libX11/commit/?id=b469da1430cdcee06e31c6251b83aede072a1ff0
Created libX11 tracking bugs for this issue: Affects: fedora-all [bug 1623251]
Is the fix going to be ported to RHEL 7?
Hi, We suggest you to open a case with Support for these kind of questions. Best regards,
This issue has been addressed in the following products: Red Hat Enterprise Linux 7 Via RHSA-2019:2079 https://access.redhat.com/errata/RHSA-2019:2079
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s): https://access.redhat.com/security/cve/cve-2018-14599
Statement: This issue did not affect the versions of libX11 as shipped with Red Hat Enterprise Linux 5 as they did not include the vulnerable code. To exploit the vulnerability an attacker would need to have already compromised the X server used by your applications. Normally, the X client that runs libX11 and the X server runs on the same machine, thus if an attacker can trigger this flaw he has already compromised the X server, which runs as root, and he has already full control on the system. If the X client runs on another system than the X server (e.g. DISPLAY environment variable is used and it points to an X server on another system) then exploiting this vulnerability would only gain the privileges of the client, which should not be run with high privileges. For the above reasons, this flaw was rated as Moderate Impact.