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<a href="https://gitlab.com/1784244538">Qianxin Cheng</a> created an issue: <a href="https://gitlab.com/gnutls/gnutls/-/issues/1675">#1675</a>
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<a href="#description-of-problem" aria-hidden="true" class="anchor" id="user-content-description-of-problem" style="margin-top: 0; float: left; margin-left: -20px; text-decoration: none; outline: none;"></a>Description of problem:</h2>
<p dir="auto" style="color: #3a383f; margin: 0 0 1rem;" align="initial">The RFC standard for X.509 CRL restricts the thisUpdate field to only two formats: UTCTime (YYMMDDHHMMSSZ) in ASN.1 representation and GeneralizedTime (YYYYMMDDHHMMSSZ). However, GnuTLS 3.7.11 accepts the thisUpdate field format as (YYYYMMDDHHZ), with a value like ("2017090721Z") in the CRL.</p>
<h2 dir="auto" style="margin-top: 1.5rem; margin-bottom: 1rem; border-bottom-style: solid; border-bottom-color: #dcdcde; font-weight: 600; font-size: 1.3125rem; letter-spacing: -0.01em; line-height: 1.25; color: #18171d; border-bottom-width: 1px; padding-bottom: 0.25rem;" align="initial">
<a href="#version-of-gnutls-used" aria-hidden="true" class="anchor" id="user-content-version-of-gnutls-used" style="margin-top: 0; float: left; margin-left: -20px; text-decoration: none; outline: none;"></a>Version of gnutls used:</h2>
<p dir="auto" style="color: #3a383f; margin: 0 0 1rem;" align="initial">GnuTLS 3.8.9</p>
<h2 dir="auto" style="margin-top: 1.5rem; margin-bottom: 1rem; border-bottom-style: solid; border-bottom-color: #dcdcde; font-weight: 600; font-size: 1.3125rem; letter-spacing: -0.01em; line-height: 1.25; color: #18171d; border-bottom-width: 1px; padding-bottom: 0.25rem;" align="initial">
<a href="#distributor-of-gnutls-eg-ubuntu-fedora-rhel" aria-hidden="true" class="anchor" id="user-content-distributor-of-gnutls-eg-ubuntu-fedora-rhel" style="margin-top: 0; float: left; margin-left: -20px; text-decoration: none; outline: none;"></a>Distributor of gnutls (e.g., Ubuntu, Fedora, RHEL)</h2>
<p dir="auto" style="color: #3a383f; margin: 0 0 1rem;" align="initial">Ubuntu</p>
<h2 dir="auto" style="margin-top: 1.5rem; margin-bottom: 1rem; border-bottom-style: solid; border-bottom-color: #dcdcde; font-weight: 600; font-size: 1.3125rem; letter-spacing: -0.01em; line-height: 1.25; color: #18171d; border-bottom-width: 1px; padding-bottom: 0.25rem;" align="initial">
<a href="#how-reproducible" aria-hidden="true" class="anchor" id="user-content-how-reproducible" style="margin-top: 0; float: left; margin-left: -20px; text-decoration: none; outline: none;"></a>How reproducible:</h2>
<p dir="auto" style="color: #3a383f; margin: 0 0 1rem;" align="initial">certtool --crl-info --inder --infile crl_file_gn_time.der</p>
<h2 dir="auto" style="margin-top: 1.5rem; margin-bottom: 1rem; border-bottom-style: solid; border-bottom-color: #dcdcde; font-weight: 600; font-size: 1.3125rem; letter-spacing: -0.01em; line-height: 1.25; color: #18171d; border-bottom-width: 1px; padding-bottom: 0.25rem;" align="initial">
<a href="#actual-results" aria-hidden="true" class="anchor" id="user-content-actual-results" style="margin-top: 0; float: left; margin-left: -20px; text-decoration: none; outline: none;"></a>Actual results:</h2>
<p dir="auto" style="color: #3a383f; margin: 0 0 1rem;" align="initial">CRL的This Update值被打印为Issued: Wed Dec 31 23:59:59 UTC 1969</p>
<h2 dir="auto" style="margin-top: 1.5rem; margin-bottom: 1rem; border-bottom-style: solid; border-bottom-color: #dcdcde; font-weight: 600; font-size: 1.3125rem; letter-spacing: -0.01em; line-height: 1.25; color: #18171d; border-bottom-width: 1px; padding-bottom: 0.25rem;" align="initial">
<a href="#expected-results" aria-hidden="true" class="anchor" id="user-content-expected-results" style="margin-top: 0; float: left; margin-left: -20px; text-decoration: none; outline: none;"></a>Expected results:</h2>
<p dir="auto" style="color: #3a383f; margin: 0;" align="initial">The RFC standard for X.509 CRL restricts the thisUpdate field to only two formats: ASN.1 encoded UTCTime (YYMMDDHHMMSSZ) and GeneralizedTime (YYYYMMDDHHMMSSZ). Therefore, it should reject a CRL with a thisUpdate field in the format (YYYYMMDDHHZ), with a value like ("2017090721Z").<a href="https://gitlab.com/-/project/179611/uploads/dbe2c4200feb727100571c3392d1feb2/crl_file_gn_time.der" data-canonical-src="/uploads/dbe2c4200feb727100571c3392d1feb2/crl_file_gn_time.der" data-link="true" class="gfm" style="margin-top: 0;">crl_file_gn_time.der</a></p>
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