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74 lines
4.4 KiB
Markdown
74 lines
4.4 KiB
Markdown
# Override package: glibc
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## EL9
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- Version `2.34-83.12.el9_3.security.0.5`
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- Based on `2.34-83.el9.12`
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### Changes summary
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- Distrust and/or unset many more environment variables used by current and previous glibc versions when running SUID/SGID/setcap (Owl via ALT Linux)
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- When `syslog(3)`/`vsyslog(3)` is called by a SUID/SGID/setcap program without a preceding call to `openlog(3)`, don't blindly trust `__progname` for the syslog ident (Owl via ALT Linux, further revised for Rocky Linux)
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- In `syslog(3)/vsyslog(3)` use `asctime_r(3)+localtime_r(3)` instead of `strftime_r()` so that month names don't depend on current locale settings (Owl via ALT Linux)
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- In `asprintf(3)/vasprintf(3)` reset the pointer to NULL on error, like BSDs do, so that the caller wouldn't access memory over an uninitialized or stale pointer (ALT Linux)
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- In `fread(3)/fwrite(3)` check for potential integer overflow (ALT Linux)
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- In `tmpfile(3)` use the `TMPDIR` environment variable (when not running SUID/SGID/setcap) (ALT Linux)
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- When `qsort(3)` is wrongly used with a nontransitive comparison function, nevertheless be robust and avoid [memory corruption](https://www.openwall.com/lists/oss-security/2024/01/30/7) (Qualys, Rocky Linux)
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#### Known-effective vulnerability mitigations and fixes
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`2.34-83.12.el9_3.security.0.5` includes `iconv(3)` ISO-2022-CN-EXT [CVE-2024-2961](../issues/CVE-2024-2961.md) fix from upstream glibc 2.34 branch.
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`2.34-60.el9_2.security.0.2` included mitigations sufficient to avoid security exposure of [CVE-2023-4911](../issues/CVE-2023-4911.md) and a backport of upstream glibc fix of [CVE-2023-4527](https://www.openwall.com/lists/oss-security/2023/09/25/1) that was not yet in upstream EL. In the update to `2.34-60.7.el9_2.security.0.3` and beyond, we retained the mitigations while rebasing on upstream EL's package with upstream fixes for these vulnerabilities (and more).
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In general, inclusion of additional security fixes will be "reverted" if and when those get included in upstream EL packages that we rebase our changes on.
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### Change log
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```
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* Thu Apr 18 2024 Solar Designer <solar@openwall.com> - 2.34-83.12.el9.security.0.5
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- Rebase on 2.34-83.12
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- Add iconv() ISO-2022-CN-EXT CVE-2024-2961 fix from upstream glibc 2.34 branch
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[... upstream changes ...]
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* Wed Jan 31 2024 Solar Designer <solar@openwall.com> - 2.34-83.7.el9.security.0.4
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- Harden syslog ident fallback initialization to use at most 64 characters of
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__progname when __libc_enable_secure, as inspired by Qualys' discovery of
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related vulnerabilities in newer glibc (not yet present in this version):
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https://www.openwall.com/lists/oss-security/2024/01/30/6
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- Harden qsort against nontransitive comparison functions as suggested by
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Qualys: https://www.openwall.com/lists/oss-security/2024/01/30/7
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* Wed Nov 22 2023 Solar Designer <solar@openwall.com> - 2.34-83.7.el9.security.0.3
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- Rebase on 2.34-83.7, drop "our" CVE-2023-4527 patch in favor of RH's
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(a similar rebase was made on Oct 6 in 2.34-60.7.el9.security.0.3 for 9.2)
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[... upstream changes ...]
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* Fri Oct 6 2023 Solar Designer <solar@openwall.com> - 2.34-60.7.el9.security.0.3
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- Rebase on 2.34-60.7, drop "our" CVE-2023-4527 patch in favor of RH's
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[... upstream changes ...]
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* Mon Oct 2 2023 Solar Designer <solar@openwall.com> - 2.34-60.el9.security.0.2
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- Add glibc-owl-alt-sanitize-env.patch stitched from several ALT Linux commits
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as none of their revisions matched this package's set of backports as-is
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- Add glibc-upstream-no-aaaa-CVE-2023-4527.patch based on upstream commit
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bd77dd7e73e3530203be1c52c8a29d08270cb25d fixing
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CVE-2023-4527: Stack read overflow with large TCP responses in no-aaaa mode
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* Tue Sep 26 2023 Solar Designer <solar@openwall.com> - 2.34-60.el9.security.0.1
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- Revise the texinfo documentation edit of glibc-2.34-alt-asprintf.patch via
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glibc-2.34-rocky-asprintf.patch
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* Sat Sep 23 2023 Solar Designer <solar@openwall.com> - 2.34-60.el9.security.0.0
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- Add some of the patches from ALT Linux as of when they were at 2.34:
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https://git.altlinux.org/gears/g/glibc.git
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git show 5fa32fb0f8509f4b2b1105d71b45966dfbadc099 > glibc-2.34-alt-tmpfile.patch
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git show f97e5d60a6a4c9cb64e3b9ee6f5113969cf07d87 > glibc-2.34-alt-asprintf.patch
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git show cd45d0f74560325cc48aedb9f56881270ab3dfab > glibc-2.34-alt-libio-bound.patch
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git show 436eb1017c04aee3a553c2868d00a4b046e5e394 > glibc-2.34-owl-alt-syslog-ident.patch
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git show 03a86c234873723c26b7e387c498c1332c223968 > glibc-2.34-mjt-owl-alt-syslog-timestamp.patch
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```
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