CVE-2020-14347

A flaw was found in the way xserver memory was not properly initialized. This could leak parts of server memory to the X client. In cases where Xorg server runs with elevated privileges, this could result in possible ASLR bypass. Xorg-server before version 1.20.9 is vulnerable.

Weakness

The product does not initialize or incorrectly initializes a resource, which might leave the resource in an unexpected state when it is accessed or used.

Affected Software

Potential Mitigations

• Use a language that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
• For example, in Java, if the programmer does not explicitly initialize a variable, then the code could produce a compile-time error (if the variable is local) or automatically initialize the variable to the default value for the variable’s type. In Perl, if explicit initialization is not performed, then a default value of undef is assigned, which is interpreted as 0, false, or an equivalent value depending on the context in which the variable is accessed.

Related Attack Patterns

• https://cwe.mitre.org/data/definitions/26.html
• https://cwe.mitre.org/data/definitions/29.html

References

• http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00066.html
• http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00075.html
• https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-14347
• https://lists.debian.org/debian-lts-announce/2020/08/msg00057.html
• https://lists.x.org/archives/xorg-announce/2020-July/003051.html
• https://security.gentoo.org/glsa/202012-01
• https://usn.ubuntu.com/4488-1/
• https://usn.ubuntu.com/4488-2/
• https://www.debian.org/security/2020/dsa-4758
• https://www.openwall.com/lists/oss-security/2020/07/31/2