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-rw-r--r--gnu/packages/patches/pam-krb5-CVE-2020-10595.patch42
1 files changed, 42 insertions, 0 deletions
diff --git a/gnu/packages/patches/pam-krb5-CVE-2020-10595.patch b/gnu/packages/patches/pam-krb5-CVE-2020-10595.patch
new file mode 100644
index 0000000000..4ca061230f
--- /dev/null
+++ b/gnu/packages/patches/pam-krb5-CVE-2020-10595.patch
@@ -0,0 +1,42 @@
+Fix CVE-2020-10595:
+
+https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-10595
+
+Patch copied from upstream advisory:
+
+https://seclists.org/oss-sec/2020/q1/128
+
+diff --git a/prompting.c b/prompting.c
+index e985d95..d81054f 100644
+--- a/prompting.c
++++ b/prompting.c
+@@ -314,26 +314,27 @@ pamk5_prompter_krb5(krb5_context context UNUSED, void *data, const char *name,
+ /*
+ * Reuse pam_prompts as a starting index and copy the data into the reply
+ * area of the krb5_prompt structs.
+ */
+ pam_prompts = 0;
+ if (name != NULL && !args->silent)
+ pam_prompts++;
+ if (banner != NULL && !args->silent)
+ pam_prompts++;
+ for (i = 0; i < num_prompts; i++, pam_prompts++) {
+- size_t len;
++ size_t len, allowed;
+
+ if (resp[pam_prompts].resp == NULL)
+ goto cleanup;
+ len = strlen(resp[pam_prompts].resp);
+- if (len > prompts[i].reply->length)
++ allowed = prompts[i].reply->length;
++ if (allowed == 0 || len > allowed - 1)
+ goto cleanup;
+
+ /*
+ * The trailing nul is not included in length, but other applications
+ * expect it to be there. Therefore, we copy one more byte than the
+ * actual length of the password, but set length to just the length of
+ * the password.
+ */
+ memcpy(prompts[i].reply->data, resp[pam_prompts].resp, len + 1);
+ prompts[i].reply->length = (unsigned int) len;