Description
Integer overflow in the vfprintf function in stdio-common/vfprintf.c in glibc 2.14 and other versions allows context-dependent attackers to bypass the FORTIFY_SOURCE protection mechanism, conduct format string attacks, and write to arbitrary memory via a large number of arguments.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 6 | nscd +7 | 2.12-1.47.el6_2.9 | RHSA-2012:0393 |
| RHEL 6 | rhev-hypervisor6 +1 | 6.2-20120423.1.el6_2 | RHSA-2012:0531 |
| RHEL 5 | nscd +6 | 2.5-81.el5_8.1 | RHSA-2012:0397 |
Advisories 3
- RHSA-2012:0531 Red Hat Security Advisory: rhev-hypervisor6 security and bug fix update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2012:0393 Red Hat Security Advisory: glibc security and bug fix update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2012:0397 Red Hat Security Advisory: glibc security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
References
- RHSA-2012:0531 vendor-advisory
- 52201 vdb-entry
- RHSA-2012:0393 vendor-advisory
- RHSA-2012:0397 vendor-advisory
- http://sourceware.org/git/?p=glibc.git%3Ba=commitdiff%3Bh=7c1f4834d398163d1ac8101e35e9c36fc3176e6e
- RHSA-2012:0488 vendor-advisory
- [libc-alpha] 20120202 [PATCH] vfprintf: validate nargs and positional offsets mailing-list
- https://bugzilla.redhat.com/show_bug.cgi?id=794766
- http://www.phrack.org/issues.html?issue=67&id=9#article