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Further EL9 glibc security hardening in response Qualys' findings

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Solar Designer 2024-01-31 21:39:29 +01:00
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These are what we consider significant SIG/Security news items, not an exhaustive list of package updates and wiki edits.
## January 31, 2024
Further EL9 [glibc](packages/glibc.md) security hardening in response to the [recent](https://www.openwall.com/lists/oss-security/2024/01/30/6) [findings](https://www.openwall.com/lists/oss-security/2024/01/30/7) by Qualys.
## January 3, 2024
[control](packages/control.md) `0.8.0-7` can now manage two SUID root PAM helper programs `unix_chkpwd` and `pam_timestamp_check`.

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## EL9
- Version `2.34-83.7.el9_3.security.0.3`
- Version `2.34-83.7.el9_3.security.0.4`
- Based on `2.34-83.el9.7`
### Changes summary
- Distrust and/or unset many more environment variables used by current and previous glibc versions when running SUID/SGID/setcap (Owl via ALT Linux)
- 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)
- 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)
- 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)
- 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)
- In `fread(3)/fwrite(3)` check for potential integer overflow (ALT Linux)
- In `tmpfile(3)` use the `TMPDIR` environment variable (when not running SUID/SGID/setcap) (ALT Linux)
- 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)
#### Known-effective vulnerability mitigations and fixes
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### Change log
```
* Wed Jan 31 2024 Solar Designer <solar@openwall.com> - 2.34-83.7.el9.security.0.4
- Harden syslog ident fallback initialization to use at most 64 characters of
__progname when __libc_enable_secure, as inspired by Qualys' discovery of
related vulnerabilities in newer glibc (not yet present in this version):
https://www.openwall.com/lists/oss-security/2024/01/30/6
- Harden qsort against nontransitive comparison functions as suggested by
Qualys: https://www.openwall.com/lists/oss-security/2024/01/30/7
* Wed Nov 22 2023 Solar Designer <solar@openwall.com> - 2.34-83.7.el9.security.0.3
- Rebase on 2.34-83.7, drop "our" CVE-2023-4527 patch in favor of RH's
(a similar rebase was made on Oct 6 in 2.34-60.7.el9.security.0.3 for 9.2)