Test ID:	1.3.6.1.4.1.25623.1.1.10.2021.0573
Category:	Mageia Linux Local Security Checks
Title:	Mageia: Security Advisory (MGASA-2021-0573)
Summary:	The remote host is missing an update for the 'x11-server' package(s) announced via the MGASA-2021-0573 advisory.
Description:	Summary: The remote host is missing an update for the 'x11-server' package(s) announced via the MGASA-2021-0573 advisory. Vulnerability Insight: Updated x11-server packages fix security vulnerabilities: The handler for the CompositeGlyphs request of the Render extension does not properly validate the request length leading to out of bounds memory write (CVE-2021-4008). The handler for the CreatePointerBarrier request of the XFixes extension does not properly validate the request length leading to out of bounds memory write (CVE-2021-4009). The handler for the Suspend request of the Screen Saver extension does not properly validate the request length leading to out of bounds memory write (CVE-2021-4010). The handlers for the RecordCreateContext and RecordRegisterClients requests of the Record extension do not properly validate the request length leading to out of bounds memory write (CVE-2021-4011). All of these issues can lead to local privileges elevation on systems where the X server is running privileged and remote code execution for ssh X forwarding sessions. Affected Software/OS: 'x11-server' package(s) on Mageia 8. Solution: Please install the updated package(s). CVSS Score: 7.2 CVSS Vector: AV:L/AC:L/Au:N/C:C/I:C/A:C
Cross-Ref:	Common Vulnerability Exposure (CVE) ID: CVE-2021-4008 Debian Security Information: DSA-5027 (Google Search) https://www.debian.org/security/2021/dsa-5027 https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PDHYZM6FII35JA7J275MFCJO6ADJUPQX/ https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/NXTRPFEQLFZ6NT2LPLZEID664RGC3OCC/ https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/NKLSZCY47QK4RCJFXITYFALCGPJAFXOK/ https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/T57DCF726O5LLTST4NBL5PQ7DLPB46HT/ https://security.gentoo.org/glsa/202305-30 https://www.zerodayinitiative.com/advisories/ZDI-21-1547/ https://lists.x.org/archives/xorg-announce/2021-December/003122.html https://lists.x.org/archives/xorg-announce/2021-December/003124.html https://lists.debian.org/debian-lts-announce/2021/12/msg00035.html Common Vulnerability Exposure (CVE) ID: CVE-2021-4009 https://www.zerodayinitiative.com/advisories/ZDI-21-1548/ Common Vulnerability Exposure (CVE) ID: CVE-2021-4010 https://www.zerodayinitiative.com/advisories/ZDI-21-1549/ Common Vulnerability Exposure (CVE) ID: CVE-2021-4011 https://www.zerodayinitiative.com/advisories/ZDI-21-1550/
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