Squid before 2.3STABLE5 in HTTP accelerator mode does not enable access control lists (ACLs) when the httpdaccelhost and httpaccelwithproxy off settings are used, which allows attackers to bypass the ACLs and conduct unauthorized activities such as port scanning.

squid 2.3 and earlier allows local users to overwrite arbitrary files via a symlink attack in some configurations.

sdiff 2.7 in the diffutils package allows local users to overwrite files via a symlink attack.

When using the LDPRELOAD environmental variable in SUID or SGID applications, glibc does not verify that preloaded libraries in /etc/ld.so.cache are also SUID/SGID, which could allow a local user to overwrite arbitrary files by loading a library from /lib or /usr/lib.

The Linux kernel 2.4.20 and earlier, and 2.5.x, when running on x86 systems, allows local users to cause a denial of service (hang) via the emulation mode, which does not properly clear TF and NT EFLAGs.

Off-by-one error in the channel code of OpenSSH 2.0 through 3.0.2 allows local users or remote malicious servers to gain privileges.