Linux Security
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    ArchLinux: 201804-4: apache: multiple issues

    Date 12 Apr 2018
    1969
    Posted By Anthony Pell
    The package apache before version 2.4.33-1 is vulnerable to multiple issues including session hijacking, access restriction bypass, content spoofing and denial of service.
    Arch Linux Security Advisory ASA-201804-4
    =========================================
    
    Severity: Medium
    Date    : 2018-04-04
    CVE-ID  : CVE-2017-15710 CVE-2017-15715 CVE-2018-1283 CVE-2018-1301
              CVE-2018-1302 CVE-2018-1303 CVE-2018-1312
    Package : apache
    Type    : multiple issues
    Remote  : Yes
    Link    : https://security.archlinux.org/AVG-664
    
    Summary
    =======
    
    The package apache before version 2.4.33-1 is vulnerable to multiple
    issues including session hijacking, access restriction bypass, content
    spoofing and denial of service.
    
    Resolution
    ==========
    
    Upgrade to 2.4.33-1.
    
    # pacman -Syu "apache>=2.4.33-1"
    
    The problems have been fixed upstream in version 2.4.33.
    
    Workaround
    ==========
    
    None.
    
    Description
    ===========
    
    - CVE-2017-15710 (denial of service)
    
    In Apache httpd 2.0.23 to 2.0.65, 2.2.0 to 2.2.34, and 2.4.0 to 2.4.29,
    mod_authnz_ldap, if configured with AuthLDAPCharsetConfig, uses the
    Accept-Language header value to lookup the right charset encoding when
    verifying the user's credentials. If the header value is not present in
    the charset conversion table, a fallback mechanism is used to truncate
    it to a two characters value to allow a quick retry (for example, 'en-
    US' is truncated to 'en'). A header value of less than two characters
    forces an out of bound write of one NUL byte to a memory location that
    is not part of the string. In the worst case, quite unlikely, the
    process would crash which could be used as a Denial of Service attack.
    In the more likely case, this memory is already reserved for future use
    and the issue has no effect at all.
    
    - CVE-2017-15715 (access restriction bypass)
    
    In Apache httpd 2.4.0 before 2.4.30, the expression specified in
     could match '$' to a newline character in a malicious
    filename, rather than matching only the end of the filename. This could
    be exploited in environments where uploads of some files are externally
    blocked, but only by matching the trailing portion of the filename.
    
    - CVE-2018-1283 (session hijacking)
    
    In Apache httpd 2.2.0 before 2.4.30, when mod_session is configured to
    forward its session data to CGI applications (SessionEnv on, not the
    default), a remote user may influence their content by using a
    "Session" header. This comes from the "HTTP_SESSION" variable name used
    by mod_session to forward its data to CGIs, since the prefix "HTTP_" is
    also used by the Apache HTTP Server to pass HTTP header fields, per CGI
    specifications.
    
    - CVE-2018-1301 (denial of service)
    
    A specially crafted request could have crashed the Apache HTTP Server
    prior to version 2.4.30, due to an out of bound access after a size
    limit is reached by reading the HTTP header. This vulnerability is
    considered very hard if not impossible to trigger in non-debug mode
    (both log and build level), so it is classified as low risk for common
    server usage.
    
    - CVE-2018-1302 (denial of service)
    
    When an HTTP/2 stream was destroyed after being handled, the Apache
    HTTP Server prior to version 2.4.30 could have written a NULL pointer
    potentially to an already freed memory. The memory pools maintained by
    the server make this vulnerability hard to trigger in usual
    configurations, the reporter and the team could not reproduce it
    outside debug builds, so it is classified as low risk.
    
    - CVE-2018-1303 (denial of service)
    
    A specially crafted HTTP request header could have crashed the Apache
    HTTP Server prior to version 2.4.30 due to an out of bound read while
    preparing data to be cached in shared memory. It could be used as a
    Denial of Service attack against users of mod_cache_socache.
    
    - CVE-2018-1312 (content spoofing)
    
    In Apache httpd 2.2.0 before 2.4.30, when generating an HTTP Digest
    authentication challenge, the nonce sent to prevent reply attacks was
    not correctly generated using a pseudo-random seed. In a cluster of
    servers using a common Digest authentication configuration, HTTP
    requests could be replayed across servers by an attacker without
    detection.
    
    Impact
    ======
    
    A remote attacker is able to crash a server, hijack a user session,
    upload arbitrary files or spoof requests by providing a crafted
    request.
    
    References
    ==========
    
    https://httpd.apache.org/security/vulnerabilities_24.html
    https://security.archlinux.org/CVE-2017-15710
    https://security.archlinux.org/CVE-2017-15715
    https://security.archlinux.org/CVE-2018-1283
    https://security.archlinux.org/CVE-2018-1301
    https://security.archlinux.org/CVE-2018-1302
    https://security.archlinux.org/CVE-2018-1303
    https://security.archlinux.org/CVE-2018-1312
    

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