https://bugzilla.redhat.com/show_bug.cgi?id=1981540
Bug ID: 1981540
Summary: CVE-2021-30639 tomcat: non-blocking I/O error flag is
not reset between requests
Product: Security Response
Hardware: All
OS: Linux
Status: NEW
Component: vulnerability
Keywords: Security
Severity: low
Priority: low
Assignee: security-response-team(a)redhat.com
Reporter: gsuckevi(a)redhat.com
CC: aileenc(a)redhat.com, akoufoud(a)redhat.com,
alazarot(a)redhat.com, alee(a)redhat.com,
almorale(a)redhat.com, anstephe(a)redhat.com,
asoldano(a)redhat.com, atangrin(a)redhat.com,
avibelli(a)redhat.com, bbaranow(a)redhat.com,
bgeorges(a)redhat.com, bmaxwell(a)redhat.com,
brian.stansberry(a)redhat.com, cdewolf(a)redhat.com,
chazlett(a)redhat.com, cmoulliard(a)redhat.com,
coolsvap(a)gmail.com, csutherl(a)redhat.com,
darran.lofthouse(a)redhat.com, dbecker(a)redhat.com,
dkreling(a)redhat.com, dosoudil(a)redhat.com,
drieden(a)redhat.com, eleandro(a)redhat.com,
etirelli(a)redhat.com, fjuma(a)redhat.com,
ggaughan(a)redhat.com, gmalinko(a)redhat.com,
gzaronik(a)redhat.com, huwang(a)redhat.com,
ibek(a)redhat.com, ikanello(a)redhat.com,
ivan.afonichev(a)gmail.com, iweiss(a)redhat.com,
janstey(a)redhat.com,
java-sig-commits(a)lists.fedoraproject.org,
jclere(a)redhat.com, jjoyce(a)redhat.com,
jochrist(a)redhat.com, jolee(a)redhat.com,
jpallich(a)redhat.com, jperkins(a)redhat.com,
jrokos(a)redhat.com, jschatte(a)redhat.com,
jschluet(a)redhat.com, jstastny(a)redhat.com,
jwon(a)redhat.com, krathod(a)redhat.com,
krzysztof.daniel(a)gmail.com, kverlaen(a)redhat.com,
kwills(a)redhat.com, lgao(a)redhat.com, lhh(a)redhat.com,
lpeer(a)redhat.com, lthon(a)redhat.com, mburns(a)redhat.com,
mkolesni(a)redhat.com, mnovotny(a)redhat.com,
msochure(a)redhat.com, msvehla(a)redhat.com,
mszynkie(a)redhat.com, nwallace(a)redhat.com,
peholase(a)redhat.com, pgallagh(a)redhat.com,
pjindal(a)redhat.com, pmackay(a)redhat.com,
rguimara(a)redhat.com, rhcs-maint(a)redhat.com,
rrajasek(a)redhat.com, rruss(a)redhat.com,
rstancel(a)redhat.com, rsvoboda(a)redhat.com,
sclewis(a)redhat.com, scohen(a)redhat.com,
slinaber(a)redhat.com, smaestri(a)redhat.com,
szappis(a)redhat.com, tom.jenkinson(a)redhat.com,
tzimanyi(a)redhat.com, yborgess(a)redhat.com
Target Milestone: ---
Classification: Other
A vulnerability in Apache Tomcat allows an attacker to remotely trigger a
denial of service. An error introduced as part of a change to improve error
handling during non-blocking I/O meant that the error flag associated with the
Request object was not reset between requests. This meant that once a
non-blocking I/O error occurred, all future requests handled by that request
object would fail. Users were able to trigger non-blocking I/O errors, e.g. by
dropping a connection, thereby creating the possibility of triggering a DoS.
Applications that do not use non-blocking I/O are not exposed to this
vulnerability. This issue affects Apache Tomcat 10.0.3 to 10.0.4; 9.0.44;
8.5.64.
Reference:
https://lists.apache.org/thread.html/rd84fae1f474597bdf358f5bdc0a5c453c50...
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