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    ArchLinux: 202011-15: libxml2: multiple issues

    Date 26 Nov 2020
    259
    Posted By LinuxSecurity Advisories
    The package libxml2 before version 2.9.10-6 is vulnerable to multiple issues including denial of service and information disclosure.
    Arch Linux Security Advisory ASA-202011-15
    ==========================================
    
    Severity: Medium
    Date    : 2020-11-17
    CVE-ID  : CVE-2019-20388 CVE-2020-7595 CVE-2020-24977
    Package : libxml2
    Type    : multiple issues
    Remote  : Yes
    Link    : https://security.archlinux.org/AVG-1263
    
    Summary
    =======
    
    The package libxml2 before version 2.9.10-6 is vulnerable to multiple
    issues including denial of service and information disclosure.
    
    Resolution
    ==========
    
    Upgrade to 2.9.10-6.
    
    # pacman -Syu "libxml2>=2.9.10-6"
    
    The problems have been fixed upstream but no release is available yet.
    
    Workaround
    ==========
    
    None.
    
    Description
    ===========
    
    - CVE-2019-20388 (denial of service)
    
    A memory leak was found in the xmlSchemaValidateStream function of
    libxml2. Applications that use this library may be vulnerable to memory
    not being freed leading to a denial of service.
    
    - CVE-2020-7595 (denial of service)
    
    xmlStringLenDecodeEntities in parser.c in libxml2 2.9.10 has an
    infinite loop in a certain end-of-file situation.
    
    - CVE-2020-24977 (information disclosure)
    
    GNOME project libxml2 <= 2.9.10 has a global buffer over-read
    vulnerability in xmlEncodeEntitiesInternal at libxml2/entities.c.
    
    Impact
    ======
    
    A remote attacker might be able to crash an application using libxml2
    or access sensitive information via a crafted XML payload.
    
    References
    ==========
    
    https://bugs.archlinux.org/task/68510
    https://gitlab.gnome.org/GNOME/libxml2/commit/7ffcd44d7e6c46704f8af0321d9314cd26e0e18a
    https://gitlab.gnome.org/GNOME/libxml2/commit/0e1a49c8907645d2e155f0d89d4d9895ac5112b5
    https://gitlab.gnome.org/GNOME/libxml2/commit/50f06b3efb638efb0abd95dc62dca05ae67882c2
    https://security.archlinux.org/CVE-2019-20388
    https://security.archlinux.org/CVE-2020-7595
    https://security.archlinux.org/CVE-2020-24977
    

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