Bug 1559241 (CVE-2018-8769)
| Summary: | CVE-2018-8769 elfutils: buffer over-read in ebldynamictagname.c:ebl_dynamic_tag_name() allows for denial of service | ||
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| Product: | [Other] Security Response | Reporter: | Sam Fowler <sfowler> |
| Component: | vulnerability | Assignee: | Red Hat Product Security <security-response-team> |
| Status: | CLOSED NOTABUG | QA Contact: | |
| Severity: | low | Docs Contact: | |
| Priority: | low | ||
| Version: | unspecified | CC: | aoliva, drepper, dsmith, fche, jakub, kanderso, mcermak, me, mjw, mjw, mnewsome, ohudlick, rschiron |
| Target Milestone: | --- | Keywords: | Security |
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | If docs needed, set a value | |
| Doc Text: |
An out-of-bound read flaw has been found in elfutils in the ebl_dynamic_tag_name function of ebldynamictagname.c file. An attacker could exploit this by supplying a crafted ELF file to display wrong data or potentially cause a crash in eu-readelf and eu-elflint binaries.
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Story Points: | --- |
| Clone Of: | Environment: | ||
| Last Closed: | 2018-04-06 13:02:41 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: | 1559242, 1559243 | ||
| Bug Blocks: | 1559245 | ||
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Description
Sam Fowler
2018-03-22 04:20:12 UTC
Created elfutils tracking bugs for this issue: Affects: fedora-all [bug 1559243] Note that this is only used by eu-readelf and eu-elflint, it isn't exposed through any library.
It isn't in upstream 0.170, but can though a backport of upstream commit:
commit 88f3d2daa107b09fdba376a82bce7ed534c93645
Author: Mark Wielaard <mark>
Date: Sat Feb 17 00:23:19 2018 +0100
libelf: Sync elf.h from glibc.
Signed-off-by: Mark Wielaard <mark>
Which is part of elfutils-0.170-elf_sync.patch which was added in Fedora in 0.170-9.
ISTM the CVSS score overstates the severity of this bug. I cannot think of a way in which confidentiality or availability is harmed by this, so 3.3=low seems to be more accurate. https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N Given that a fix is already in upstream elfutils, any objections to CLOSED/NEXTRELEASE for the fedora BZ? I lowered the CVSSv3 score. Only Availability is affected, because you could make the program crash in case ebl_dynamic_tag_name returns a pointer to unmapped memory. It could also print other strings or values found in the process memory, but there is no way for an attacker to extract those strings, so I didn't put C:L. Correction to previous comment: depending on how the programs gets compiled, the ebl_dynamic_tag_name function could either return a valid or an invalid pointer. In the first case you would just see a wrong string when displaying ELF info, in the second case you would get a crash. Thus I:L, A:L in the CVSSv3 score. Statement: This issue did not affect the versions of elfutils as shipped with Red Hat Enterprise Linux 5, 6, and 7 as they did not include the vulnerable commit. This issue did not affect the versions of elfutils as shipped with Red Hat Developer Toolset 6 and 7 as they did not include the vulnerable commit. |