Bug 1287636 (CVE-2015-8386)
| Summary: | CVE-2015-8386 pcre: Buffer overflow caused by lookbehind assertion (8.38/6) | ||
|---|---|---|---|
| Product: | [Other] Security Response | Reporter: | Adam Mariš <amaris> |
| Component: | vulnerability | Assignee: | Red Hat Product Security <security-response-team> |
| Status: | CLOSED ERRATA | QA Contact: | |
| Severity: | low | Docs Contact: | |
| Priority: | low | ||
| Version: | unspecified | CC: | adam.stokes, andrew, carnil, csutherl, databases-maint, dknox, erik-fedora, fedora-mingw, fedora, fidencio, jclere, jdornak, jdoyle, jgrulich, jorton, klember, lgao, lkundrak, marcandre.lureau, mbabacek, mclasen, mmaslano, myarboro, ppisar, pslavice, rcollet, rjones, rmeggins, rsvoboda, sardella, shiwang, slawomir, twalsh, walters, webstack-team, weli, yozone |
| Target Milestone: | --- | Keywords: | Security |
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | pcre 8.38 | Doc Type: | Bug Fix |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2016-11-15 13:40:07 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
| Bug Depends On: | 1287639, 1287640, 1287641, 1287642, 1330455, 1330456, 1330508, 1330509 | ||
| Bug Blocks: | 1287727 | ||
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Description
Adam Mariš
2015-12-02 13:17:16 UTC
Created pcre tracking bugs for this issue: Affects: fedora-all [bug 1287639] Created glib2 tracking bugs for this issue: Affects: fedora-all [bug 1287641] Created mingw-pcre tracking bugs for this issue: Affects: fedora-all [bug 1287640] Affects: epel-7 [bug 1287642] Corresponds to item 6 in http://vcs.pcre.org/pcre/code/trunk/ChangeLog?view=markup Fixed in upstream with:
commit 9f2cf82ed9380bb4a726250833d6a0d295be8747
Author: ph10 <ph10@2f5784b3-3f2a-0410-8824-cb99058d5e15>
Date: Tue May 19 16:02:06 2015 +0000
Fix buffer overflow for lookbehind within mutually recursive subroutines.
git-svn-id: svn://vcs.exim.org/pcre/code/trunk@1560 2f5784b3-3f2a-0410-8824-cb99058d5e15
Reproducer is passing ".*?\h.+.\.+\R*?\xd(?i)(?=!(?=b`b`b`\`b\xa9b!)`\a`bbbbbbbbbbbbb`bbbbbbbbbbbb*R\x85bbbbbbb\C?{((?2)(?))((\H){8(?<=(?1){29}\xa8bbbb\x16\xd\xc6^($(?<! )(\xa9H4){4}h}1)B))\x15')" expression to pcretest under valgrind.
pcre-8.38-1.fc22 has been pushed to the Fedora 22 stable repository. If problems still persist, please make note of it in this bug report. (In reply to Petr Pisar from comment #5) > Fixed in upstream with: > > commit 9f2cf82ed9380bb4a726250833d6a0d295be8747 > Author: ph10 <ph10@2f5784b3-3f2a-0410-8824-cb99058d5e15> > Date: Tue May 19 16:02:06 2015 +0000 > > Fix buffer overflow for lookbehind within mutually recursive subroutines. Upstream SVN commit link is: http://vcs.pcre.org/pcre?view=revision&revision=1560 The issue corrected in r1560 seems to date back to very old PCRE versions. Version 3.9 (in Red Hat Enterprise Linux 3) was not affected, while version 4.5 (in Red Hat Enterprise Linux 4) already contains the bug. I've not tried to pin point specific version. Upstream SVN also only seems to have code as of version 6.0. I could reduce the pattern noted in comment 6 down to: /(?=((?2))((x){(?<=(?1){29}\xaaXABCDE(x(?<!)(\xaaXA){4}A}B)C)))/ This pattern triggers a valgrind detected out of bounds read in PCRE versions 8.34 - 8.37. Upstream r1379 seems to be what makes this issue detectable by valgrind, as that commits adds new opcodes and consequently changes which code paths are used when compiling the above pattern. Another symptom of this bug is an error as this: Failed: internal error: unknown opcode in find_fixedlength() at offset 62 This has limited out of bounds read impact. This issue has been addressed in the following products: Red Hat Enterprise Linux 7 Via RHSA-2016:1025 https://rhn.redhat.com/errata/RHSA-2016-1025.html This issue has been addressed in the following products: Red Hat Software Collections for Red Hat Enterprise Linux 7.1 EUS Red Hat Software Collections for Red Hat Enterprise Linux 7.2 EUS Red Hat Software Collections for Red Hat Enterprise Linux 7 Red Hat Software Collections for Red Hat Enterprise Linux 6.6 EUS Red Hat Software Collections for Red Hat Enterprise Linux 6 Red Hat Software Collections for Red Hat Enterprise Linux 6.7 EUS Via RHSA-2016:1132 https://access.redhat.com/errata/RHSA-2016:1132 This issue has been addressed in the following products: Red Hat Software Collections for Red Hat Enterprise Linux 6 Red Hat Software Collections for Red Hat Enterprise Linux 6.7 EUS Red Hat Software Collections for Red Hat Enterprise Linux 7 Red Hat Software Collections for Red Hat Enterprise Linux 7.2 EUS Red Hat Software Collections for Red Hat Enterprise Linux 7.3 EUS Via RHSA-2016:2750 https://rhn.redhat.com/errata/RHSA-2016-2750.html |